Department of Health and Human Services PUBLIC AND ENVIRONMENTAL HEALTH SERVICE

File No.: HO7966

Annual Report - Drinking Water Quality (Microbiological) of Public Water Supplies in 1 July 2007 - 30 June 2008

Contents

INTRODUCTION ...... 1

TASMANIA’S DRINKING WATER QUALITY REGULATORY FRAMEWORK...... 2

OVERALL PERFORMANCE OF TASMANIA’S DRINKING WATER SUPPLIERS...... 4

CONCLUSION ...... 13

SUMMARIES OF PERFORMANCE OF INDIVIDUAL WATER SUPPLIERS...... 14

BREAK O’D AY COUNCIL ...... 15 BRIGHTON COUNCIL ...... 17 BURNIE CITY COUNCIL ...... 18 CENTRAL COAST COUNCIL ...... 19 CENTRAL HIGHLANDS COUNCIL ...... 21 ...... 23 CLARENCE COUNCIL ...... 24 ...... 25 DEVONPORT CITY COUNCIL ...... 27 DORSET COUNCIL ...... 28 ...... 31 ...... 32 GLAMORGAN SPRING BAY COUNCIL ...... 33 GLENORCHY CITY COUNCIL ...... 35 HOBART CITY COUNCIL ...... 36 ...... 37 ...... 40 ...... 41 ...... 43 ...... 44 LAUNCESTON CITY COUNCIL ...... 45 ...... 47 NORTHERN MIDLANDS COUNCIL ...... 49 ...... 52 SOUTHERN MIDLANDS COUNCIL ...... 53 WARATAH /W YNYARD COUNCIL ...... 55 ...... 57 ...... 60 CRADLE COAST WATER ...... 61 ESK WATER ...... 64 HOBART WATER ...... 66

Introduction

This Annual Drinking Water Quality Report for 2007-2008 is part of the overall commitment by the Department of Health and Human Services’ Public & Environmental Health Service to protect public health. This protection is achieved by establishing legislation that promotes best practice in drinking water quality management, regulating and providing advice to water suppliers who manage public drinking water supply systems and informing the public of the status of drinking water quality in Tasmania.

A requirement of the Public Health Act 1997 and its subsidiary legislation , the Drinking Water Quality Guidelines is the submission of annual drinking water quality reports by the water suppliers. This report by the Director of Public Health consolidates the information supplied by the water suppliers to create a statewide view on drinking water quality in Tasmania as supplied through public drinking water supply systems. This report is primarily focused on the microbiological quality of drinking water, as this represents the greatest public health risk in Tasmania. The fundamental requirement for drinking water to be free of microbiological contamination, establishes the foundation for provision of safe drinking water and is aligned to the first guiding principle of the Australian Drinking Water Guidelines 2004 which states ‘The greatest risks to consumers of drinking water are pathogenic microorganisms. Protection of water sources and treatment are of paramount importance and must never be compromised’.

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Tasmania’s Drinking Water Quality Regulatory Framework Regulatory framework

Tasmania’s regulatory framework to ensure safe drinking water remains unchanged from the last Annual Report and comprises of the following pieces of legislation: Public Health Act 1997; and Drinking Water Quality Guidelines ( which commenced on 17 November 2005)

The Public and Environmental Health Service (PEHS) within the Department of Health and Human Services ensures water suppliers of public water supply systems meet their regulatory obligations stated within the legislation. Additionally, PEHS provides guidance for the water suppliers on legislative requirements. The focus of this report is on the following specific legislative requirements: • Microbiological sampling compliance

• Bacteriological compliance • Boil Water Alerts and other mitigation actions • Drinking Water Management Plans.

Public Health Act 1997 Drinking Water Quality Guidelines The Public Health Act 1997 Drinking Water Quality Guidelines were released in November 2005. These Guidelines differed from their predecessor in that minimum microbiological sampling frequency and the development of Drinking Water Quality Management Plans were introduced.

Microbiological Sampling Compliance Water suppliers must sample and test drinking water from their drinking water systems in accordance with the frequency prescribed in the ADWG and the Public Health Act 1997 Drinking Water Quality Guidelines . The correct frequency (and therefore number of samples) is vital to demonstrate the monitoring is sufficiently representative of the ‘whole’ of the water given to the consumer throughout the year. The purpose of taking microbiological samples of drinking water is to verify that the drinking water supply system is effective in removing any harmful bacteria that would pose a risk to public health however it should be noted that sampling of the water at the end of its ‘production’ and just prior to delivery to the consumer is not intended to be used as the sole mechanism to operationally manage a drinking water supply system.

With respect to microbiological sampling, the Tasmanian Drinking Water Guidelines, 2005 state “water supplied by a drinking water supply system must be sampled and tested at an accredited laboratory for Escherichia coli (or thermotolerant coliforms) in accordance with Table 10.2 of the ADWG, unless the drinking water supply system receives treated water from a bulk water authority in which case a lower frequency of sampling is sufficient provided monitoring can demonstrate the maintenance of an effective chlorine residual”. Additionally, “Water supplied by a drinking water supply system which supplies less than 1000 consumers must be sampled and tested at an accredited laboratory for Escherichia coli (or thermotolerant coliforms) once per week, unless it can be demonstrated that water quality management practices are such that the level of

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microbial risk does not represent a threat to public health in which case a lower frequency of sampling is sufficient.”

The additional paragraph quoted above recognises that weekly sampling by water authorities for very small communities - which is not uncommon in Tasmania - may not always be feasible. In such cases there can be scope for a reduction in sampling frequency if other control measures are in place, e.g. boil water alerts.

Bacteriological compliance

Drinking water suppliers need to demonstrate that the drinking water supply systems which they manage meet the bacteriological health guideline values in the Australian Drinking Water Guidelines 2004 (ADWG). The criterion is that 98% of all drinking water samples collected from a drinking water supply system do not contain any E.coli (or theromotolerant coliforms) . E.coli and thermotolerant coliforms are indicator organisms (i.e. they themselves may not necessarily be harmful) of faecal pollution in the water. These organisms originate from the intestines of many animals and in humans. The presence of E.coli or thermotolerant coliforms in drinking water indicates the potential presence of other harmful bacteria (which also exist in faeces) that pose a high risk to public health. Detection of any E.coli or thermotolerant coliforms in a drinking water sample suggests a potentially serious fault in the effectiveness and integrity of the drinking water supply system and requires immediate investigation. The absence of these organisms in samples helps to verify that all the steps (whether a treatment process or an operational procedure) in the water supply system are being effective in producing safe drinking water. Boil Water Alerts and mitigation actions When samples fail (i.e. E.coli or thermotolerant coliforms are detected), water suppliers must undertake immediate corrective actions to ensure there is no public health risk. Most commonly, the source of the contamination is quickly identified and the contamination can be removed or treated. At other times however, a more wide ranging investigation is required and temporary boil water alerts are issued by the water supplier to protect the public in the meantime. Permanent boil water alerts occur in systems that are not able to remedy the contamination (in Tasmania this is usually because there is no or inadequate water treatment process in the first place) so the public are required to take action against contaminated water. Drinking Water Quality Management Plans Water suppliers must have prepared a drinking water quality management plan containing the information prescribed in the Public Health Act 1997 Drinking Water Quality Guidelines for each of their public drinking water supply systems.

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Overall Performance of Tasmania’s Drinking Water Suppliers

Drinking Water Suppliers in Tasmania

There is a total of 107 public drinking water supply systems in Tasmania. Twenty-eight (28) local government councils are the drinking water suppliers for 91 public drinking water supply systems. The remaining 16 systems are operated and managed by the three bulk water authorities (Cradle Coast Water, Esk Water and Hobart Water). These bulk water authorities capture, treat, store and bulk distribute drinking water to their local government owners who in turn store and reticulate drinking water to consumers. One local government council does not provide a reticulated water supply.

Figure 1 indicates 13 local government councils receive water from a bulk water authority and therefore operate drinking water supply systems that consist only of storage and reticulation of water. Ten (10) local government councils solely operate public drinking water supplies from catchment to tap, as their drinking water supply systems are not connected to bulk water supply systems (i.e. do not obtain water directly from a bulk water authority) while five local government councils receive water from a bulk water authority for some of their systems and also singularly manage systems that produce drinking water from catchment to tap.

5 councils

13 councils

10 councils

water from bulk water supply systems manage from catchment to tap have both types of systems

Figure 1: Number of local government councils managing different types of drinking water supply systems

Drinking Water Supply Systems in Tasmania

The majority of drinking water supply systems in Tasmania are quite linear – that is, water is collected at the source (or at the connection with the bulk water system) and flows through various infrastructure to reach the consumer without mixing with other systems. This infrastructure design has provided the basis

4 of 70 for defining a drinking water supply system for the purpose of providing a consistent statewide perspective on drinking water. The main exception is Hobart Water’s bulk water supply system. This bulk water supply system has been split into four ‘catchment systems’ which then use a set of pipeline systems that interconnect so that the councils receiving bulk water from Hobart Water can receive water from a single catchment or a combination of several catchments. Conversely, some communities are provided with drinking water supply systems which have previously been viewed singularly - such as a North-West Council’s “reticulation system” which actually comprises of three independent reticulation systems, as the source water originates from three different catchments and the reticulation systems do not interlink. Defining a drinking water supply system is vitally important for two reasons. Firstly, identification and description of the structural entity of a supply system is the foundation required for a risk assessment which will highlight where water quality is at risk throughout the system and secondly, the microbiological sampling requirements to demonstrate bacteriological compliance need to be correlated to the size of the population serviced by a defined system.

Populations The last census (ABS, 2006) indicated that the population of Tasmania was 476 481 but this has since grown to 500,00 in 2008 . Based on the population estimates for each supply system in this report 1, approximately 88% of Tasmanians receive their drinking water from a public drinking water supply system. Due to the highly dispersed population, many of the public drinking water supply systems are servicing very small populations. Figure 2 shows that 49% of the local government drinking water supply systems are servicing less than 500 people. Such figures indicate that there are very small rate payer bases for many systems thereby illustrating the fiscal, technical and resource challenges faced by many local government water suppliers.

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20%

49% 18% 100000 - 5000 5000 - 1000 1000 - 500 <500

13%

Figure 2: Percentage of local government drinking water supply systems for each population range.

1 Approximations only; based on data provided by the water suppliers or extrapolation from data provided by water suppliers concerning the number of connections per system in combination with population information obtained from ABS Census 2006 data.

Table 1 shows that although there are few large drinking water supply systems they are in fact servicing the majority (88%) of the population receiving reticulated water in Tasmania while 62% of the drinking water supply systems are small to very small and servicing only 5% of the population. Table 1 : Percentage of the total number of drinking water supply systems and total population receiving reticulated water

Size (based on population Percentage of the total number Percentage of the population serviced) of drinking water supply systems receiving reticulated water

Large (100 000 – 5000) 20% 87%

Medium (5000 – 1000) 18% 8%

Small (<1000) 13% 2%

Very small (<500) 49% 3%

Water Treatment

There is a range of water treatment processes which are applied in Tasmania’s drinking water supply systems. Figure 3 indicates that amongst the local government drinking water supply systems, 22% of systems have no water treatment at all while “chlorination only” systems are the most prominent (28%).

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“Chlorination only” systems are drinking water supply systems that only have one treatment barrier (i.e. chlorination) against all microbiological hazards that may be present in the source water. Important to note is that chlorination can become ineffective if the source water becomes turbid (which commonly occurs during rain events and/or drought conditions). Figure 4 demonstrates “chlorination only” systems also exist amongst the bulk drinking water supply systems. Source waters for such ‘chlorination only’ bulk water supply systems are of high quality and additionally these systems are operationally monitored with continuous in-line instrumentation connected to alarms indicating potential loss of chlorination effectiveness.

26% 22%

None Chlorination only Multiple treatment processes from Bulk Water Authority 24% 28%

Figure 3: Percentage of local government drinking water supply systems and their respective water treatment

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8

7

6

5

none 4 chlorination only

multiple treatment processes 3 Number of Number water supplysystems 2

1

0 Cradle Coast Water Esk Water Hobart Water Bulk Water Authority

Figure 4: Water treatment processes used in bulk water supply systems A fundamental requirement for safe drinking water is to correlate the amount and type of water treatment with the hazards posed to water quality in that system. For example, if water is sourced from a relatively pristine environment, the main hazard to public health from the drinking water would be bacteriological contamination which a single water treatment process - disinfection - would generally suffice to ensure safe drinking water. If, however, water was sourced from a heavily impacted catchment, then multiple and appropriate water treatment processes would be required in the drinking water supply system to ensure all the hazards (microbiological, chemical, physical) are eliminated or reduced to an acceptable level which would not pose a risk to public health. Furthermore, other barriers beyond treatment are required throughout the drinking water supply system to ensure the water is not re-contaminated. Examples of such barriers are roofs on reservoirs, good operational procedures to reduce recontamination during main repairs and installation of backflow prevention devices.

Capital and operational costs correspondingly increase with the amount and type of water treatment processes required. It is the current challenge to all water suppliers to incorporate appropriate water treatment processes to ensure safe drinking water. Concurrently, the other challenge for water suppliers, government and multiple stakeholders is to ensure good drinking water catchment management so source waters do not continue to degrade in quality. Poor or lack of drinking water catchment management will incur increasing costs to the public as upgrades and additions to water treatment infrastructure will be required to manage the declining quality of the source water.

Microbiological Sampling Compliance

The degree of confidence that water suppliers have met bacteriological compliance criteria is very dependant on the required number of samples being collected. All the drinking water supply systems managed by the bulk water authorities were sufficiently sampled and complied with their required microbiological sampling frequency.

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Table 2 indicates that of the total 69 water supply systems managed by local government council (those systems operating with a permanent boil water alert in place have been excluded), 41 systems were adequately sampled in terms of full compliance with the microbiological sampling frequency recommended by the ADWG and the Tasmanian Drinking Water Guidelines. Twenty eight drinking water supply systems were not adequately sampled. This is a slight improvement from the last reporting period (2006 – 2007) in which only 34 systems were adequately sampled. The improvement in sampling compliance occurred amongst the drinking water supply systems servicing communities with less than 1000 consumers - with 17 such systems being adequately sampled in contrast with only 10 systems in 2006-2007.

Table 2: Number of drinking water supply systems compliant with required microbiological sampling frequency (excluding those with permanent boil water alerts in place)

Number of drinking water supply systems

Population serviced Adequate sampling frequency Non compliant in sampling frequency

Greater than 1000 24 10

Less than 1000 17 18

With respect to drinking water supply systems operating with permanent boil water alerts, the intent of microbiological sampling is not to determine compliance but rather to use the monitoring results to optimise the effectiveness of the boil water notice. Hence drinking water supply systems with a permanent boil water alert need monitoring to detect declining quality in the water being reticulated to the consumer and communicate the increase in public health risk to the community. For example, if the sampling results reveal temporary higher than normal levels of E.coli then such information should prompt the water supplier to issue a reminder notice to all consumers to boil their drinking water and avoid ingesting untreated water, as the risk to public health has increased.

Additionally, sampling of systems on permanent boil water alert has been allowed to decrease when coupled with regular catchment sanitation inspections (which can be equally as important as sampling).

Bacteriological Compliance

The determination of the bacteriological compliance of a drinking water supply system is dependent on the collection of sufficient microbiological samples (see section above) as insufficient microbiological monitoring can result in periods of time when the water may be contaminated but the monitoring program would not detect such occurrences. For the purpose of this report, bacteriological compliance has not been determined for systems which were not sampled sufficiently. However, bacteriological non-compliance was evident despite the insufficient sampling conducted for two systems. The bacteriological compliance criteria which is prescribed in the Australian Drinking Water Guidelines (2004) is that 98% of drinking water samples collected from the drinking water supply system do not contain any E.coli (or thermotolerant coliforms). This criterion recognises that no system is fail-proof but the margin of allowable error is very small, thus establishing a high standard for compliance and assurance for the consumer.

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Figure 5 shows that for the reporting period (2007 – 2008) the level of bacteriological compliance was very high amongst the bulk drinking water supply systems (94%), while the level of bacteriological compliance was not able to be determined in 38% of the local government drinking water supply systems (again, excluding drinking water supply systems with permanent boil water alerts) due to insufficient collection of microbiological samples. Among the local government drinking water supply systems which were sufficiently sampled, 85% bacteriologically complied. This level of bacteriological compliance is slightly higher than the 82% of systems which complied in the last reported period. Overall, there has been an improvement from 52 to 59% known bacteriological compliance amongst Tasmania’s drinking water supply systems when comparing their performance in 2006-07 and 2007-2008.

100

90

80

70

60

Bacteriological non-compliance 50 Bacteriological compliance Bacteriological compliance unknown

40

30 Percentage of Percentage drinking water supplysystems 20

10

0 Local Government Councils Bulk Water Authorities Tasmania Water Supplier

Figure 5: Compliance of drinking water supply systems with bacteriological criteria (98% of samples with no E.coli ) amongst bulk water and local government drinking water supply systems The intent of bacteriological compliance is to measure the effectiveness in the management of drinking water supply systems and to demonstrate that the systems have the capability to address bacteriological hazards from catchment (or collection point from a bulk water supply system) to tap.

When bacteriological compliance is not met, the water supplier needs to identify the factors contributing to the inability to meet the required standard and instigate short and long term plans to improve the system. At all times, the drinking water supply should not pose a threat to public health, hence the need for short term corrective actions such as temporary boil water notices, dosing of service reservoirs with chlorine or removal of contaminated water until long term solutions can be achieved. These longer term solutions can include installation of new equipment or infrastructure, improved competency (knowledge and technical skills) of staff through training or provision of more human resources to the management of the drinking water supply system. Boil Water Alerts and other mitigative actions A total of 23 drinking water supply systems operate with a permanent boil water alert. The number of systems operating with a permanent boil alert has remained the same since 2004. These systems provide drinking water for only 1.1% of the population and are listed in Table 3. The majority of these systems do not have any water treatment processes in place. Improvements to such systems has proven to be difficult for the small local government water suppliers as they face the fiscal challenges in providing costly 10 of 70 infrastructure to small communities. Equally, some small communities have made it known to their local government council that they do not wish to have their water supply treated, due to either the cost imposed on them or in a few cases their desire to have drinking water free of any water treatment chemicals.

Table 3: Tasmanian drinking water supply systems operating with a permanent boil water alert in 2007-08.

System Water Supplier Water treatment Population (approx)

Cornwall Break O’Day Council None 95

Fingal Break O’Day Council None 455

Mathinna Break O’Day Council None 145

Ellendale Central Highlands None 150 Council

Gretna Central Highlands None 105 Council

Branxholm Dorset Council None 300

Derby Dorset Council None 160

Gladstone Dorset Council None 200

Herrick Dorset Council None 30

Legerwood Dorset Council None 120

Pioneer Dorset Council None 70

Ringarooma Dorset Council None 300

Winnaleah Dorset Council None 220

Lady Barron Flinders Council None 170

Whitemark Flinders Council None 390

Swansea Glamorgan Spring Bay Chlorination only 550 Council

Franklin Huon Valley Council Chlorination only 40

Judbury Huon Valley Council None 185

Mountain River Huon Valley Council None 90

Lilydale Launceston City Council None 290

Mole Creek Meander Valley Council None 210

Poatina Managed by Northern None 165 Midlands

Rossarden Northern Midlands None 105 Council

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A total of four temporary boil water alerts were implemented by water suppliers to manage transient threats to public health during their drinking water systems failure. Water suppliers of two other drinking water supply systems provided an alternative safe drinking water supply (rather than a boil water alert) by carting potable water from another drinking water supply system to ensure the provision of safe drinking water. Temporary boil water alerts were issued for two ‘chlorination only’ drinking water supply systems, one drinking water supply system with multiple water treatment processes in place and one reticulation system.

The reasons for the temporary boil water alerts were: - ineffective chlorination due to turbid source water (drought affected catchments); - technical difficulties in ensuring effectiveness of treatment processes to match varying source water quality (as a result of drought); and

- contamination due to a breach of the vermin proofing installation at a service reservoir Furthermore water suppliers of two drinking water supply systems were able to immediately identify and rectify the system’s failures without having to issue a boil water alert. Drinking Water Quality Management Plans

The Tasmanian Drinking Water Quality Guidelines released in November 2005 requested all water suppliers to develop and implement Drinking Water Quality Management Plans for each of the drinking water supply systems which they manage. Drinking Water Quality Management Plans have now been prepared for all drinking water supply systems in the state. The requirement for water suppliers to develop and implement Drinking Water Quality Management Plans for their drinking water systems was established in the Public Health Act 1997 Drinking Water Quality Guidelines and follows the national approach prescribed in the Australian Drinking Water Guidelines 2004. This risk management approach is systematic and preventative and its intent is to assure water quality and protect the public. The best way to achieve this is to risk manage all the steps in the ‘production’ of drinking water from catchment to tap, rather than the previous management philosophy based on ‘end product’ testing. In other words, if each step of the drinking water supply system has preventative measures in place so that significant public health hazards can be eliminated and or reduced to acceptable levels, then the drinking water should be safe to drink. This risk management approach encourages the adoption of multiple barriers within drinking water supply systems and critical control points which are managed closely to ensure contaminants do not pose a threat to public health.

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Conclusion

Bacteriological compliance for drinking water supply systems managed by bulk water authorities remains high with only one system failing to meet the bacteriological compliance criteria. The level of bacteriological compliance for drinking water supply systems in Tasmania managed by local government councils as water suppliers has improved slightly, however a significant number of water supplies are still not sufficiently sampled for statistical assessment of compliance with bacteriological parameters and therefore the level of bacteriological compliance for such systems remains unknown.

Compliance with the microbiological sampling requirements has improved significantly with 38% of water supply systems (as opposed to 51% of systems in the previous reporting period) managed by local government councils being insufficiently monitored with respect to bacteriological parameters. This does not mean that the water was unsafe to drink, but as stated above, correct frequency of monitoring will assist determination of bacteriological compliance and quality management of the system. The Public and Environmental Health Service will continue to address this matter with these water suppliers. The number of permanent boil water alerts in the state (23) has remained the same for the past several years, with the systems on which they are imposed generally servicing only very low numbers of consumers; however progression towards removal of a permanent boil water alert by a water supplier is still to be encouraged particularly in communities that could increase in population and/or are frequented by tourists. The implementation of the Drinking Water Quality Management Planning process is still in its early stage with water suppliers progressing numerous actions identified for completion within the first two years of implementing the Drinking Water Quality Management Plans. During 2009 the Public and Environmental Health Service will be reviewing the extent of implementation of those Plans by the water suppliers.

Tasmania continues to be challenged with providing safe drinking water to a highly dispersed population, and in the main does this well for the great majority of the population. At the time of writing this Report, only three months remain before the planned operational commencement of three new regional water and sewerage corporations. The water and sewerage reform has ‘kick started’ significant water and sewerage infrastructure projects which will be committed through to completion by the new water and sewerage corporations. The public health outcomes from these projects are significant, with one project in particular providing a treated water supply for a tourist town which has endured a permanent boil water alert for many years. With such significant institutional change in the water industry through the creation of water and sewerage corporations solely focussed on water and sewerage services, it is anticipated considerable improvement in public health protection will be achieved in the near future.

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Summaries of performance of individual water suppliers

The following section contains the individual performance of each water supplier with respect to the public drinking water supply systems which they manage.

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Break O’Day Council

Name of Source water Water treatment Approximate Compliance with Compliance with Boil Water water supply population serviced by Bacteriological Microbiological Alerts system water supply system criteria Sampling requirements

Cornwall Spring in Nicholas None 95 N/A N/A Permanent Range

Fingal Township Creek with None 455 N/A N/A Permanent back up from South Esk River

Mathinna South Esk River None 145 N/A N/A Permanent

Scamander Scamander River Chlorination only 505 No * No Temporary

St Helens Georges River Coagulation/ flocculation, 4320 UK∞ No No dissolved air flotation, filtration, pH adjustment, chlorination, fluoridation

St Marys Bore water with back Pre-chlorination, Dynasand 765 UK∞ No No up from Newman’s filtration, Calgon treatment, pH Creek and Margison adjustment (when required), Creek chlorination, fluoridation

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UK∞ Unknown - insufficient sampling to determine bacteriological compliance * Bacteriological non compliance was evident despite insufficient sampling Overview

Population: Five of the six drinking water supply systems (Cornwall, Fingal, Mathinna, Scamander and St Marys) supply water for populations less than 1000. Treatment: Water from the Cornwall, Fingal and Mathinna drinking water supply systems does not receive any treatment. Water from the Scamander drinking water supply system is chlorinated only. No other water treatment is applied to the water. The St Helens and St Marys drinking water supply system has various water treatment processes which are applied to the water. Bacteriological Compliance: The Scamander drinking water supply system did not meet the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Bacteriological compliance for St Helens and St Marys drinking water supply systems is unknown due to insufficient microbiological sampling. Boil Water Alerts: Cornwall, Fingal and Mathinna are drinking water supply systems operating with a permanent boil water alert in place A temporary boil water alert was issued at Scamander in February 2008. Sampling Compliance: Insufficient numbers of microbiological samples were taken for the St Helens, Scamander and St Marys water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Break O’Day Council has prepared Drinking Water Quality Management Plans for each of their drinking water supply systems. Incidents/Events: A temporary boil water notice was issued at Scamander in February 2008. A significant rain event had increased the turbidity of the source water rendering chlorination ineffective. Once the turbidity of the source water decreased, chlorination was able to resume adequately disinfection of the water.

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Brighton Council

Name of water Source water Water Approximate population Compliance with Compliance with Microbiological Boil Water supply system treatment serviced by water supply Bacteriological criteria Sampling requirements Alerts system

Brighton Supplied from N/A 12380 Yes Yes No Hobart Water

Overview Population: The Brighton drinking water supply system services a population of more than 10 000 people. Treatment: The Brighton drinking water supply system is composed of seven storage and reticulation systems which are mostly interlinked and provided with water from Hobart Water’s bulk water supply system originating from the River Derwent catchment. Bacteriological Compliance: The Brighton drinking water supply system met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Brighton supply system according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Brighton Council has prepared a Drinking Water Quality Management Plan for its drinking water supply system.

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Burnie City Council

Name of Source water Water treatment Approximate Compliance with Compliance with Boil water population serviced by Bacteriological Microbiological Sampling Water supply water supply system criteria requirements Alerts system

Burnie Guide and Pet Iron/Manganese removal (if required), 19 500 Yes Yes No River coagulation/ flocculation, filtration, pH

Catchments adjustment, chlorination, fluoridation

Overview

Population: The Burnie drinking water supply system services a population of more than 15 000 people. Treatment: The Burnie drinking water supply system has various water treatment processes which are applied to the water. Bacteriological Compliance: The Burnie drinking water supply system met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Burnie supply system according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Burnie City Council has prepared a Drinking Water Quality Management Plan for its drinking water supply system.

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Central Coast Council

Name of water Source water Water Approximate population Compliance with Compliance with Boil Water supply system treatment serviced by water supply Bacteriological criteria Microbiological Sampling Alerts system requirements

Forth/Leith Supplied from N/A 300 Yes Yes No Cradle Coast

Water

Penguin/ Sulphur Supplied from N/A 4 000 Yes Yes No Creek/ Heybridge Cradle Coast

Water

Ulverstone/ Turners Supplied from N/A 13 000 Yes Yes Temporary Beach Cradle Coast

Water

Overview Population: The Central Coast drinking water supply systems service a total population of more than 15 000 people. The service population of the Ulverstone/ Turners Beach system can increase to 16 000 people during summer. Treatment: The Central Coast drinking water supply system is supplied with treated water from three of the bulk water systems managed by Cradle Coast Water. The Ulverstone/ Turners Beach system is supplied by Cradle Coast Water’s Gawler bulk water supply system. The Penguin/ Sulphur Creek/ Heybridge system is supplied by Cradle Coast Water’s Leven bulk water supply system and the Forth/Leith system is supplied with water from Cradle Coast Water’s Forth bulk water supply system which also supplements the Ulverstone/ Turners Beach system during the peak summer period.

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Bacteriological Compliance: All the Central Coast drinking water supply systems met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Boil Water Alerts: A temporary boil water alert was issued in January 2008. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Central Coast drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Central Coast Council (in collaboration with Cradle Coast Water) has prepared a Drinking Water Quality Management Plan for their drinking water supply system. Incidents/Events: Low level of E.coli contamination in the drinking water was detected in the East Ulverstone area during January 2008. A temporary boil water alert was issued. The Central Coast Council undertook an extensive investigation and determined that the contamination may have been caused by birds which are breached a service reservoir’s vermin proofing. Approximately 230 households were advised to boil their water before drinking until the integrity of the reservoir’s vermin proofing was restored.

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Central Highlands Council

Name of water Source water Water treatment Approximate population Compliance with Compliance with Boil Water supply system serviced by water supply Bacteriological criteria Microbiological Sampling Alerts system requirements

Bothwell Clyde River Coagulation/ 400 UK ∞ No No Flocculation, sand

filtration, chlorination

Ellendale Jones River None 150 N/A N/A Permanent

Gretna Derwent River None 105 N/A N/A Permanent

Hamilton Derwent River Chlorination only 210 UK ∞ No No

Ouse Derwent River Chlorination only 275 UK ∞ No No

Wayatinah Liapootah Power Chlorination only 115 UK ∞ No No Station Penstock

UK ∞ Unknown - insufficient sampling to determine bacteriological compliance

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Overview Population: All six drinking water supply systems supply water for populations less than 1000. Treatment: Water from the Ellendale and Gretna drinking water supply systems does not receive any treatment. Water from the Hamilton, Ouse and Wayatinah drinking water supply systems is chlorinated only. No other water treatment is applied to the water. The Bothwell drinking water supply system has various water treatment processes which are applied to the water. Bacteriological Compliance: Unknown due to insufficient microbiological sampling. Boil Water Alerts: Ellendale and Gretna are drinking water supply systems operating with a permanent boil water alert in place Sampling Compliance: Insufficient numbers of microbiological samples were taken for the Bothwell, Hamilton, Ouse and Wayatinah drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Central Highland Council has prepared Drinking Water Quality Management Plans for all their drinking water supply systems.

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Circular Head Council

Name of water Source water Water Approximate population Compliance with Compliance with Boil Water supply system treatment serviced by water supply Bacteriological criteria Microbiological Sampling Alerts system requirements

Circular Head Supplied from N/A 4 400 Yes Yes No Cradle Coast

Water

Overview

Population: The Circular Head drinking water supply system services a population of more than 1 000 people. Treatment: The Circular Head drinking water supply system is composed of three storage and reticulation systems (Smithton, Irishtown and Stanley) which are provided with water from the Deep Creek bulk water supply system managed by Cradle Coast Water. Bacteriological Compliance: The Circular Head drinking water supply systems met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004 Boil Water Alerts: None required Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Circular Head drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Circular Head Council (in collaboration with Cradle Coast Water) has prepared a Drinking Water Quality Management Plan for its drinking water supply system.

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Clarence Council

Name of water Source water Water Approximate population Compliance with Compliance with Boil Water supply system treatment serviced by water supply Bacteriological criteria Microbiological Sampling Alerts system requirements

Clarence Supplied from N/A 46 300 Yes Yes No Hobart Water

Overview

Population: The Clarence drinking water supply system services a population of greater than 45 000 people. Treatment: The Clarence drinking water supply system is composed of twelve systems based on pressure (i.e. pressure zones) plus the Richmond district system. All the pressure zones and the Richmond district system are provided with water from Hobart Water’s bulk water supply system originating from the River Derwent catchment. Bacteriological Compliance: The Clarence drinking water supply systems met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Clarence drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Clarence City Council has prepared a Drinking Water Quality Management Plan for its drinking water supply system.

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Derwent Valley Council

Name of water Source water Water treatment Approximate population Compliance with Compliance with Boil supply system serviced by water supply Bacteriological criteria Microbiological Sampling Water system requirements Alerts

Maydena Maydena Range Chlorination only 300 UK∞ No No

National Bulk Water N/A 175 Yes Yes No Park/Westerway from Hobart Water

New Norfolk Supplied from N/A 7790 UK∞ No No Hobart Water

Illa Brook Fluoridation & chlorination only

UK∞ Unknown - insufficient sampling to detect bacteriological compliance Overview Population: Two of the three drinking water supply systems (Maydena and National Park/Westerway) supply water for populations less than 1000. Treatment: Water from the Maydena drinking water supply system is chlorinated only. No other water treatment is applied to the water. The New Norfolk drinking water supply system can be provided from either Hobart Water’s bulk water supply system originating from the River Derwent catchment or from the Illa Brook catchment. When the New Norfolk drinking water supply system is supplied with water sourced from the Illa Brook catchment, the water is chlorinated only. No further water treatment is applied to the water. When the New Norfolk drinking water supply system is supplied with water from Hobart Water’s bulk system, the water has been treated via various processes.

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The National Park/Westerway drinking water supply system is provided with water from Hobart Water’s bulk water supply system originating from Lake Fenton/Lady Barron Creek catchment (which is a chlorination only treatment system) Bacteriological Compliance: The National Park/Westerway drinking water supply system meet the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. The bacteriological compliance for the remainder of the drinking water supply systems is unknown due to insufficient microbiological sampling. Boil Water Alerts: None required. Sampling Compliance: Insufficient numbers of microbiological samples were taken for the Maydena and New Norfolk drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Derwent Valley Council has prepared Drinking Water Quality Management Plans for each of their drinking water supply systems including the smaller drinking water schemes of Granton, Molesworth, Sorell Creek and Lawitta which comprise of consumers who live in the Derwent Valley Council municipality but obtain water directly from Hobart Water’s bulk water pipelines.

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Devonport City Council

Name of water Source water Water Approximate population Compliance with Compliance with Boil supply system treatment serviced by water supply Bacteriological criteria Microbiological Sampling Water system requirements Alerts

Devonport Supplied from N/A 24 000 Yes Yes No Cradle Coast

Water

Paloona Supplied from N/A 850 Yes Yes No Cradle Coast Water

Overview Population: The Devonport drinking water supply systems service a total population of more than 20 000 people. Treatment: Cradle Coast Water’s Forth bulk water supply system provides water for Devonport while Cradle Coast Water’s Paloona bulk water supply system provides drinking water for Paloona, Melrose and Eugenana. Drinking water from Cradle Coast Water’s Paloona system has been disinfected only (using chlorine) while water from Cradle Coast Water’s Forth system has been fully treated by Cradle Coast Water. Bacteriological Compliance: Both Devonport drinking water supply systems met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Devonport drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Devonport City Council (in collaboration with Cradle Coast Water) has prepared a Drinking Water Quality Management Plan for their drinking water supply system.

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Dorset Council

Name of water Source water Water treatment Approximate Compliance with Compliance with Boil Water supply system population serviced by Bacteriological Microbiological Sampling Alerts water supply system criteria requirements

Branxholm Guiding Star Creek None 300 N/A N/A Permanent

Bridport Brid River Coagulation/ Flocculation, 2110 UK∞ No No clarification, filtration, chlorination, fluoridation

Derby Winnaleah Irrigation None 160 N/A N/A Permanent Scheme (from Cascade Dam)

Gladstone Ringarooma River None 200 N/A N/A Permanent

Herrick Winnaleah Irrigation None 30 N/A N/A Permanent Scheme (from Cascade Dam)

Legerwood Bore – groundwater None 120 N/A N/A Permanent

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Pioneer Frome Dam None 70 N/A N/A Permanent

Ringarooma Bore – groundwater None 300 N/A N/A Permanent with backup supply from Viney’s Creek

Scottsdale Brid River and Forrester Coagulation/ Flocculation, 2130 No Yes No River clarification, filtration, chlorination, fluoridation

Winnaleah Bore - Groundwater None 220 N/A N/A Permanent

UK∞ Unknown - insufficient sampling to determine bacteriological compliance

Overview Population: Eight of the ten drinking water supply systems (Branxholm, Derby, Gladstone, Herrick, Legerwood, Pioneer, Ringarooma, and Winnaleah) supply water for populations less than 1000. Treatment: Water from the Branxholm, Derby, Gladstone, Herrick, Legerwood, Pioneer, Ringarooma and Winnaleah drinking water supply systems does not receive any treatment. The Bridport and Scottsdale drinking water supply systems have various water treatment processes which are applied to the water. Bacteriological Compliance: The Scottsdale drinking water supply system did not meet the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Bacteriological compliance for the Bridport drinking water supply system was unknown due to insufficient microbiological sampling.

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Boil Water Alerts: Branxholm, Derby, Herrick, Legerwood, Pioneer, Ringarooma, Winnaleah drinking water supply systems operate with a permanent boil water alert in place Gladstone’s drinking water supply system although compliant with the bacteriological standard for drinking water, also operates with a permanent boil water alert as a precautionary measure due to the lack of any treatment process in this water supply system (i.e. lack of treatment process that could remove any bacteriological contaminants which could occur in the source water) Part of the Scottsdale drinking water supply system provides drinking water to 75 connections prior to the treatment processes. The affected consumers are informed that their drinking water needs to be boiled prior to consumption. Sampling Compliance: Insufficient numbers of microbiological samples were taken for the Bridport drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Dorset Council has prepared Drinking Water Quality Management Plans for all their drinking water supply systems.

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Flinders Council

Name of water Source Water Approximate population Compliance with Compliance with Microbiological Boil Water supply system water treatment serviced by water supply Bacteriological criteria Sampling requirements Alerts system

Lady Barron Bore – None 125 N/A N/A Permanent ground

water

Whitemark Pats River None 390 N/A N/A Permanent

Overview Population: Both drinking water supply systems managed by Flinders Council supply water for populations less than 1000. Treatment: Water from the Lady Barron and Whitemark drinking water supply systems does not receive any treatment. Boil Water Alerts: The Whitemark drinking water supply system operates with a permanent boil water alert in place. The Lady Barron drinking water supply system although compliant with the bacteriological standard for drinking water, operates with a permanent boil water alert as a precautionary measure due to the lack of any treatment process.

Drinking Water Quality Management Plans: Council has prepared Drinking Water Quality Management Plans for all their drinking water supply systems.

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George Town Council

Name of water Source water Water Approximate population Compliance with Compliance with Boil Water supply system treatment serviced by water supply Bacteriological criteria Microbiological Sampling Alerts system requirements

George Town/ Supplied from N/A 4800 UK∞ No No Hillwood/ Low Esk Water

Head

UK∞ Unknown - insufficient sampling to determine bacteriological compliance

Overview

Population: The George Town/ Hillwood/ Low Head drinking water supply system services a population of more than 1 000 people. Treatment: The George Town/ Hillwood/ Low Head drinking water supply system is provided with water from the Esk Water’s North Esk bulk water supply system. Bacteriological Compliance: The bacteriological compliance was unknown due to insufficient microbiological sampling. Boil Water Alerts: None required. Sampling Compliance: Insufficient numbers of microbiological samples were taken for the George Town/ Hillwood/ Low Head drinking water supply system according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: George Town Council has prepared a Drinking Water Quality Management Plan for its drinking water supply system.

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Glamorgan Spring Bay Council

Name of Source water Water treatment Approximate Compliance with Compliance with Boil Water water supply population serviced by Bacteriological Microbiological Sampling Alerts system water supply system criteria requirements

Bicheno Apsley River Coagulation/ flocculation, dissolved 700 No Yes Temporary air flotation, filtration, chlorination

Coles Bay Saltwater Coagulation/flocculation, 250 Yes Yes No River clarification, filtration, chlorination

Orford Prosser River Coagulation/flocculation, 500 Yes Yes No clarification, filtration, chlorination, fluoridation

Swansea Swan River Chlorination only 550 N/A N/A Permanent

Triabunna Maclaines Sand filtration, chlorination, 700 Yes Yes No Creek – fluoridation Brady’s Dam

Overview Population: All six drinking water supply systems supply water for populations less than 1000 however the service populations of the Bicheno, Coles Bay, Orford and Swansea system can increase to 2800, 1110, 3000 and 750 people during the summer period.

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Treatment: Water from the Swansea drinking water supply system is chlorinated only. No other water treatment is applied to the water. The Bicheno, Coles Bay, Orford and Triabunna drinking water supply systems have various water treatment processes which are applied to the water. Bacteriological Compliance: The Bicheno drinking water supply system did not meet the long term bacteriological standard for drinking water as prescribed in the ADWG 2004 Boil Water Alerts: The Swansea drinking water supply system operates with a permanent boil water alert in place A temporary boil water alert was issued for Bicheno in July 2007. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Glamorgan Spring Bay drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Management Plans: Glamorgan Spring Bay Council has prepared Drinking Water Quality Management Plans for all their drinking water supply systems. Incident/Events: A temporary boil water alert was issued at Bicheno in July 2007. Ineffective filtration and chlorination as a result of increasing turbidity in the source water (Apsley River) was the reason for the notice.

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Glenorchy City Council

Name of water Source water Water Approximate population Compliance with Compliance with Boil Water supply system treatment serviced by water supply Bacteriological criteria Microbiological Sampling Alerts system requirements

Glenorchy Supplied from N/A 48 070 Yes Yes No Hobart Water

Overview

Population: The Glenorchy drinking water supply system services a population of more than 40 000 people. Treatment: The Glenorchy drinking water supply system is composed of ten reticulation systems. All the reticulation systems are provided with water from Hobart Water’s bulk water supply system originating from the River Derwent catchment, Lake Fenton/Lady Barron catchment and the Mt Wellington (Glenorchy) catchment. Bacteriological Compliance: The Glenorchy drinking water supply system met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Glenorchy drinking water supply system according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Glenorchy City Council has prepared a Drinking Water Quality Management Plan for its drinking water supply system.

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Hobart City Council

Name of water Source water Water No. of connections/ Compliance with Compliance with Microbiological Boil Water supply system treatment approximate service Bacteriological criteria Sampling requirements Alerts population

Hobart Supplied from N/A 47 000 Yes Yes No Hobart Water

Overview Population: The Hobart drinking water supply system services a population of more than 45 000 people. Treatment: The Hobart drinking water supply system is composed of twelve reticulation zones. All the zones are provided with water from Hobart Water’s bulk water supply system originating from the River Derwent catchment, Lake Fenton/Lady Barron catchment and the Mt Wellington (Hobart) catchment. Bacteriological Compliance: The Hobart drinking water supply systems met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. . Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Hobart drinking water supply system according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines

Drinking Water Quality Management Plans: Hobart City Council has prepared a Drinking Water Quality Management Plan for its drinking water supply system.

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Huon Valley Council

Name of water Source water Water treatment Approximate Compliance with Compliance with Boil Water supply system population serviced by Bacteriological Microbiological Sampling Alerts water supply system criteria requirements

Cygnet – Agnes Agnes Creek Coagulation/ flocculation, 170 UK∞ No No Creek clarification, filtration, pH

adjustment, chlorination

Cygnet – Nicholls Rivulet Fluoridation and chlorination 1480 UK∞ No No Nicholls Rivulet only

Dover Esperance River Coagulation/ flocculation, 950 UK∞ No No clarification, filtration, pH adjustment, chlorination, fluoridation

Franklin Stephens Chlorination only 40 N/A N/A Permanent Creek/Fleurtys Rivulet

Geeveston – Scotts Rivulet Coagulation/ flocculation, 430 UK∞ No No Donnelly’s clarification, filtration, pH adjustment, chlorination, fluoridation

Geeveston - Kermandie Rivulet Fluoridation and chlorination 1155 UK∞ No No Kermandie only

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Huon – Rocky Rocky Creek Fluoridation & chlorination only 1035 UK∞ No No Creek

Huonville Huon River Coagulation/ flocculation, 2130 Yes Yes No clarification, filtration, pH adjustment, chlorination, fluoridation

Judbury Dora Creek None 185 N/A N/A Permanent

Mountain River Stevensons Creek None 90 N/A N/A Permanent

UK∞ Unknown - insufficient sampling to determine bacteriological compliance

Overview Population: Four of the ten drinking water supply systems (Cygnet – Nicholls Rivulet, Geeveston – Kermandie, Huon – Rocky Creek and Huonville) services a population greater than 1000. Treatment: Water from the Judbury and Mountain River drinking water supply systems does not receive any treatment. Water from the Cygnet – Nicholls Rivulet, Franklin, Geeveston – Nicholls, Huon – Rocky Creek drinking water supply systems is chlorinated only. No other water treatment is applied to the water. The Cygnet – Agnes Creek, Dover, Geeveston – Donnellys and Huonville drinking water supply systems have various water treatment processes which are applied to the water.

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Bacteriological Compliance: The Huonville drinking water supply system met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. The bacteriological compliance for the remainder of the drinking water supply systems is unknown due to insufficient microbiological sampling. Boil Water Alerts: The Franklin, Judbury and Mountain River drinking water supply systems operate with a permanent boil water alert in place Sampling Compliance: Insufficient numbers of microbiological samples were taken for the Cygnet – Agnes Creek, Cygnet – Nicholls Rivulet, Dover, Geeveston – Donnelly’s, Geeveston – Kermandie Rd, and Huon – Rocky Creek drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Huon Valley Council has prepared Drinking Water Quality Management Plans for all their drinking water supply systems.

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Kentish Council

Name of water Source water Water Approximate population Compliance with Compliance with Boil Water supply system treatment serviced by water supply Bacteriological criteria Microbiological Sampling Alerts system requirements

Sheffield/ Railton Supplied from N/A 2050 UK∞ No No Cradle Coast

Water

UK∞ Unknown - insufficient sampling to determine bacteriological compliance Overview

Population: The Sheffield/ Railton drinking water supply system services a population of more than 1000 people. Treatment: The Sheffield/ Railton drinking water supply system is provided with treated water from the Barrington bulk water supply system managed by Cradle Coast Water. Bacteriological Compliance: Bacteriological compliance was unknown due to insufficient microbiological sampling. Boil Water Alerts: None required. Sampling Compliance: Insufficient numbers of microbiological samples were taken for the Sheffield/ Railton drinking water supply system according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Kentish Council (in collaboration with Cradle Coast Water) has prepared a Drinking Water Quality Management Plan for their drinking water supply system.

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King Island Council

Name of Source Water treatment Approximate population Compliance with Compliance with Boil water supply water serviced by water supply Bacteriological Microbiological Sampling Water system system criteria requirements Alerts

Currie Bore – Chlorination & UV only 900 Yes Yes No ground

water

Grassy Grassy Coagulation/ flocculation, powdered 125 No * No No Dam activated carbon, filtration, pH adjustment, chlorination

UK∞ Unknown - insufficient sampling to determine bacteriological compliance * Bacteriological non compliance was evident despite insufficient sampling Overview Population: Both drinking water supply systems supply water for populations less than 1000. The service population of the Currie system can increase to 1000 people during summer. Treatment: The Currie drinking water supply system consists of source water from two bores. Water from one bore is chlorination while water from the second bore is disinfected using ultraviolet light (UV). Disinfection is the only treatment process of this water supply system. The Grassy drinking water supply system has various water treatment processes which are applied to the water. Bacteriological Compliance: The Currie drinking water supply system met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Although the insufficient samples were taken for the Grassy drinking water supply system, bacteriological non compliant of this drinking water supply system was evident.

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Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Currie drinking water supply system but not the Grassy drinking water supply system in according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: King Island Council has prepared a Drinking Water Quality Management Plan for their drinking water supply systems.

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Kingborough Council

Name of water Source water Water Approximate population Compliance with Compliance with Boil Water supply system treatment serviced by water supply Bacteriological criteria Microbiological Sampling Alerts system requirements

Kingborough Supplied from N/A 31 500 Yes Yes No Hobart Water

Overview

Population: The Kingborough drinking water supply system services a population of more than 30 000 people. Treatment: The Kingborough drinking water supply system is provided with water from Hobart Water’s bulk water supply system originating from the Mt Wellington (Hobart) catchment and the River Derwent catchment. Bacteriological Compliance: The Kingborough drinking water supply system met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Kingborough drinking water supply system according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Kingborough Council has prepared a Drinking Water Quality Management Plan for its drinking water supply system.

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Latrobe Council

Name of water Source water Water Approximate population Compliance with Compliance with Boil supply system treatment serviced by water supply Bacteriological criteria Microbiological Sampling Water system requirements Alerts

Latrobe/Port Sorell Supplied from N/A 6 180 Yes Yes No Cradle Coast

Water

Overview

Population: The Latrobe/ Port Sorell drinking water supply system services a population of more than 5000 people. Treatment: The Latrobe/ Port Sorell drinking water supply system is provided with treated water from Cradle Coast Water’s Forth bulk water supply system. Bacteriological Compliance: The Latrobe/ Port Sorell drinking water supply system met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Latrobe/ Port Sorell drinking water supply system according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Latrobe Council (in collaboration with Cradle Coast Water) has prepared a Drinking Water Quality Management Plan for their drinking water supply system.

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Launceston City Council

Name of water Source water Water Approximate population Compliance with Compliance with Boil Water supply system treatment serviced by water supply Bacteriological criteria Microbiological Sampling Alerts system requirements

Launceston – Bulk water from N/A 30 115 Yes Yes No Distillery Creek Esk Water

Launceston – Bulk water from N/A 25 945 Yes Yes No Chimney Saddle Esk Water

Launceston – Bulk water from N/A 2 045 Yes Yes No Mount Leslie Esk Water

Lilydale Rocky Creek & None 290 N/A N/A Permanent McGowans Creek

Overview Population: The Lilydale drinking water supply supplies water for a population less than 1000 while the Launceston drinking water supply system supplies water for a population greater than 55 000. Treatment: The Launceston – Distillery Creek, Chimney Saddle and Mt Leslie drinking water supply systems consist of three storage and reticulation systems with each receiving treated water from a unique bulk water system namely, Esk Water’s Distillery Creek, North Esk and Mt Leslie bulk water supply systems.

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Water from the Lilydale drinking water supply system does not receive any treatment. Bacteriological Compliance: The three Launceston drinking water supply systems (Distillery Creek, Chimney Saddle and Mt Leslie) met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004 Boil Water Alerts: The Lilydale drinking water supply system operates with a permanent boil water alert in place Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Launceston drinking water supply system according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Launceston City Council has prepared Drinking Water Quality Management Plans for each of their drinking water supply systems.

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Meander Valley Council

Name of water Source water Water treatment Approximate Compliance with Compliance with Boil Water supply system population serviced by Bacteriological Microbiological Alerts water supply system criteria Sampling requirements

Bracknell Liffey River Chlorination only 370 UK∞ No No

Carrick/Prospect Bulk Water from N/A 7270 Yes Yes No Vale/Hadspen Esk Water

Deloraine Meander River Coagulation/ flocculation, 2740 Yes Yes No dissolved air flotation, filtration, chlorination, fluoridation

Exton Meander River Chlorination only 190 No Yes Temporary

Mole Creek Foothills of Great None 210 N/A N/A Permanent Western Tiers – South Mole Creek

Westbury/Hagley Meander Valley Fluoridation and chlorination 2250 UK∞ No No only

∞ insufficient sampling to confirm bacteriological compliance

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Overview Population: Three of the six drinking water supply systems (Bracknell, Exton and Mole Creek) supply water for populations less than 1000. Treatment: Water from the Mole Creek drinking water supply system does not receive any treatment. Water from the Bracknell, Exton and Westbury/Hagley drinking water supply systems is chlorinated only. No other water treatment is applied to the water.

The Deloraine drinking water supply system has various water treatment processes which are applied to the water. The Carrick/Prospect Vale/Hadspen drinking water supply system is provided with treated water from Esk Water’s South Esk bulk water supply system. Water to Carrick is in fact supplied via the Hadspen reticulation system. Bacteriological

Compliance: The Carrick/Prospect Vale/Hadspen and the Deloraine drinking water supply systems met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. The Exton drinking water supply system was not bacteriologically compliant. The remainder of the drinking water supply systems was unknown due to insufficient microbiological sampling. Boil Water Alerts: The Mole Creek drinking water supply system operates with a permanent boil water alert in place. A temporary boil water alert was issued at Exton in January 2008. Sampling Compliance: Insufficient numbers of microbiological samples were taken for the Bracknell, Exton and Westbury/Hagley drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Meander Valley Council has prepared Drinking Water Quality Management Plans for each of their drinking water supply systems.

Incidents/Events: A temporary boil water notice was issued at Exton. Ineffective chlorination due to increased turbidity of the source water was the reason for the notice.

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Northern Midlands Council

Name of water Source Water treatment Approximate Compliance with Compliance with Boil Water supply system water population serviced by Bacteriological Microbiological Sampling Alerts water supply system criteria requirements

Avoca South Esk Chlorination only 200 Yes Yes No River

Campbell Town Elizabeth Fluoridation and chlorination only 815 No Yes No River

Conara South Esk Chlorination only 100 Yes Yes No River

Cressy Macquarie Chlorination only 640 Yes Yes No River

Epping South Esk Chlorination only 40 Yes Yes No River

Evandale/Longford/ Macquarie Coagulation/ flocculation, 6500 Yes Yes No River dissolved air flotation, filtration, Perth pH adjustment, chlorination, fluoridation

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Poatina * ? None 165 N/A N/A Permanent

Ross Macquarie Chlorination only 275 Yes # Yes No # River

Rossarden South Esk None 105 N/A N/A Permanent River

* Private water supply managed by Northern Midlands Council UK∞ Unknown - insufficient sampling to determine bacteriological compliance # see note on incident/events below

Overview Population: Seven of the eight drinking water supply systems (Avoca, Campbell Town, Conara, Cressy, Epping, Ross and Rossarden) supply water for populations less than 1000. Treatment: Water from the Rossarden drinking water supply system does not receive any treatment. Water from the Avoca, Campbell Town, Conara, Cressy, Epping and Ross drinking water supply systems is chlorinated only. No other water treatment is applied to the water. The Evandale/Longford/Perth drinking water supply system has various water treatment processes which are applied to the water. Bacteriological Compliance: The Campbell Town drinking water supply system did not meet the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Boil Water Alerts: The Rossarden drinking water supply system operates with a permanent boil water alert in place. No temporary boil water alerts were issued.

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Sampling Compliance: Insufficient numbers of microbiological samples were taken for the Avoca, Campbell Town, Conara, Cressy and Ross drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Management Plans: Northern Midlands Council has prepared Drinking Water Quality Management Plans for each of their drinking water supply systems.

# Incidents/Events: From 13 December 2006 till present time, the source water for the Ross drinking water supply system has experienced a persistent Synechocystis algal bloom – reflecting the current drought conditions. Residents were advised not to drink the water and also to avoid body contact, on a precautionary basis. The Council has provided alternative supplies in the form of bottled water and a temporary tank filled with treated water (which the residents can access) from the Longford water treatment plant.

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Sorell Council

Name of water Source water Water Approximate population Compliance with Compliance with Microbiological Boil Water supply system treatment serviced by water supply Bacteriological criteria Sampling requirements Alerts system

Sorell/ Midway Supplied from N/A 5250 Yes Yes No Point/ Penna Hobart Water

Overview

Population: The Sorell/ Midway Point/Penna drinking water supply system services a population of more than 5000 people. Treatment: The Sorell/ Midway Point/Penna drinking water supply system is provided with water from Hobart Water’s bulk water supply system originating from the River Derwent catchment. Bacteriological Compliance: The Sorell/Midway Point/Penna drinking water supply system met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Sorell/Midway Point/Penna drinking water supply system according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Sorell Council has prepared a Drinking Water Quality Management Plan for its drinking water supply system.

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Southern Midlands Council

Name of water Source water Water treatment Approximate population Compliance with Compliance with Boil supply system serviced by water supply Bacteriological Microbiological Sampling Water system criteria requirements Alerts

Campania – Bulk water from N/A 2500 UK∞ No No Kempton Hobart Water

Colebrook Stainers Spring Chlorination only 200 UK∞ No No catchment area

Oatlands Blackman River Coagulation/ flocculation, 1 200 UK∞ No No clarification, filtration, chlorination, fluoridation

Tunbridge Blackman River Chlorination only 200 UK∞ No No

UK∞ Unknown - insufficient sampling to determine bacteriological compliance Overview Population: One of the four drinking water supply systems (Campania – Kempton) supply water to a population greater than 1000. Treatment: Water from the Colebrook and Tunbridge drinking water supply systems is chlorinated only. No other water treatment is applied to the water. The Oatlands drinking water supply system has various water treatment processes which are applied to the water.

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The Campania - Kempton drinking water supply system is divided into area systems – the Campania/Rekuna/Tea Tree and the Mangalore/Bagdad/Dysart/Kempton systems. Both these area systems are provided with the same treated water from the Hobart Water’s bulk water supply system originating from the Derwent River catchment. Bacteriological Compliance: Bacteriological compliance was unknown due to insufficient microbiological sampling. Boil Water Alerts: None required. Sampling Compliance: Insufficient numbers of microbiological samples were taken for all the Southern Midlands drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality Management Plans: Southern Midlands Council has prepared Drinking Water Quality Management Plans for each of their drinking water supply systems.

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Waratah/Wynyard Council

Name of water supply Source water Water Approximate population Compliance with Compliance with Boil system treatment serviced by water supply Bacteriological criteria Microbiological Sampling Water system requirements Alerts

Waratah Waratah Dam Chlorination 200 Yes Yes No only

Wynyard/Somerset Supplied from N/A 7 000 Yes Yes No Cradle Coast

Water

Yolla Supplied from N/A 200 Yes Yes No Cradle Coast Water

Overview Population: Two of the three Waratah Wynyard drinking water systems (Yolla and Waratah) service populations of less than 1000. During school days, the population serviced by the Yolla drinking water supply system increases from 200 to approximately 450 due to the student and teacher attendance at the local primary and district secondary school. Treatment: Both the Wynyard/Somerset and Yolla drinking water supply systems are supplied with water from Cradle Coast Water’s Cam River and Dowlings Creek bulk water supply system, respectively. Water from the Waratah drinking water supply system is chlorinated only. No other water treatment is applied to the water.

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Bacteriological Compliance: All the Waratah/Wynyard drinking water supply systems met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the Waratah - Wynyard drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines . Drinking Water Quality Management Plans: Waratah Wynyard Council (in collaboration with Cradle Coast Water) has prepared a Drinking Water Quality Management Plan for their drinking water supply system.

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West Coast Council

Name of water Source water Water treatment Approximate Compliance with Compliance with Boil supply system population serviced by Bacteriological Microbiological Water water supply system criteria Sampling requirements Alerts

Queenstown Mount Owen – Sand filtration, fluoridation Conglomerate Creek and chlorination

Cutten St supply (Eastern Fluoridation and chlorination 2000 No Yes No side of Queen River only Valley)

Lovett St/ Hurst St Fluoridation and chlorination supply (Eastern side of only Queen River Valley)

Rosebery Black Mountain – Sand filtration, fluoridation Mountain Creek and chlorination

1000 Yes Yes No Stirling Valley – Stitt Fluoridation and chlorination River only

Strahan Manuka River Coagulation/ flocculation, 500 UK∞ No No clarification, filtration, pH adjustment, chlorination, fluoridation

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Tullah Lake Rosebery Coagulation/ flocculation, 300 UK∞ No No clarification, filtration, pH adjustment, chlorination

Zeehan Lake Fischer – Parting Coagulation/ flocculation, 650 UK∞ No No Creek clarification, filtration, pH adjustment, chlorination, fluoridation

UK∞ Unknown - insufficient sampling to determine bacteriological compliance Overview Population: Three of the five West Coast drinking water systems (Strahan, Tullah and ) service populations of less than 1000. The service population of the Strahan system can increase to 1500 people during summer. Treatment: The Queenstown drinking water supply system consists of water supplied from three catchments, Conglomerate Creek, Cutten St supply and Lovett St supply which are then merged to supply the Queenstown reticulation system. Water from the Cutten St and Lovetts St systems is chlorinated only while water from the Conglomerate Creek source is sand filtered and chlorinated prior to merging with the other supplies. The Rosebery drinking water supply system consists of water supplied from two catchments, Mountain Creek and Stitts River which supplement each other and are merged to supply the Rosebery reticulation system . Water from the Mountain Creek is chlorinated only while water from the Stitts River is sand filtered and chlorinated prior to merging with the other supply. The Strahan, Tullah and Zeehan drinking water supply systems have various water treatment processes which are applied to the water. Bacteriological Compliance: The Queenstown drinking water supply system did not meet the long term bacteriological standard for drinking water as prescribed in the ADWG 2004 while the Rosebery drinking water supply did meet the bacteriological requirements. Bacteriological compliance for the remainder of the drinking water supply systems was unknown due to insufficient microbiological sampling. Boil Water Alerts: None required Sampling Compliance: Insufficient numbers of microbiological samples were taken for the Strahan, Tullah and Zeehan drinking water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines Drinking Water Quality

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Management Plans: West Coast Council has prepared a Drinking Water Quality Management Plan for their drinking water supply system.

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West Tamar Council

Name of water Source water Water Approximate population Compliance with Compliance with Microbiological Boil Water supply system treatment serviced by water supply system Bacteriological criteria Sampling requirements Alerts

West Tamar Supplied from N/A 23 375 Yes Yes No Esk Water

Overview

Population: The West Tamar drinking water supply system services a population of more than 20 000 people. Treatment: The West Tamar drinking water supply system is provided with treated water from Esk Water’s West Tamar bulk water supply system. Bacteriological Compliance: The West Tamar drinking water supply system met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004. Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for the West Tamar drinking water supply system according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines . Drinking Water Quality Management Plans: West Tamar Council has prepared a Drinking Water Quality Management Plan for its drinking water supply system.

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Cradle Coast Water

Name of bulk Source water Water treatment Recipient local council Compliance with Compliance with Boil water supply reticulation system/s Bacteriological Microbiological Water system criteria Sampling requirements Alerts

Barrington Lake Coagulation/ flocculation, Kentish Council – Sheffield/ Railton Yes Yes No Barrington dissolved air flotation, filtration, pH adjustment, chlorination, fluoridation

Cam River Cam River Coagulation/ flocculation, Waratah-Wynyard Council – Yes Yes No clarification, filtration, pH Wynyard/Somerset adjustment, chlorination, fluoridation

Deep Creek Lake Mikany – Coagulation/ flocculation, Circular Head Council – Circular Yes Yes No Deep Creek dissolved air flotation, filtration, Head reticulation (Smithton,

pH adjustment, chlorination, Irishtown, Stanley) fluoridation

Dowlings Creek Dowlings Membrane filtration, Waratah-Wynyard Council – Yolla No Yes No Creek chlorination

Forth River Forth River Coagulation/ flocculation, Central Coast Council – Forth/ Yes Yes No clarification, filtration, pH Leith (& can supplement the adjustment, chlorination, Ulverstone/ Turners Beach system) fluoridation Devonport City Council – Devonport

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Latrobe Council – Latrobe/ Port Sorell

Gawler River Lake Isandula Coagulation/ flocculation, Central Coast Council – Yes Yes No - Gawler clarification, filtration, pH Ulverstone/Turners Beach River adjustment, chlorination, fluoridation

Leven River Leven River Coagulation/ flocculation, Central Coast Council – Penguin/ Yes Yes No dissolved air flotation, filtration, Sulphur Creek/Heybridge pH adjustment, chlorination, fluoridation

Paloona Lake Paloona Chlorination only Devonport City Council– Paloona Yes Yes No

Overview Population: In total, the Cradle Coast Water bulk water supply systems provide bulk water for approximately 58 725 people. The largest bulk water system is the Forth system which supplies water to approximately 23 450 people (in Devonport, Forth and Leith and supplements the supply for Ulverstone and Turners Beach) while the smallest bulk water supply system is the Dowlings Creek system which supplies drinking water to approximately 200 people at Yolla. Treatment: All the bulk water supply systems except the Paloona system have various water treatment processes which are applied to the water. Bulk water from the Paloona system is only chlorinated. No further water treatment is applied to the water. Bacteriological Compliance: The Dowlings Creek bulk drinking water supply system did not meet the long term bacteriological standard for drinking water as prescribed in the ADWG 2004 Boil Water Alerts: None required.

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Sampling Compliance: Sufficient numbers of microbiological samples were taken for all of Cradle Coast Water’s bulk water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines . Drinking Water Quality Management Plans: Cradle Coast Water in collaboration with all their recipient (i.e. customer) councils has prepared Drinking Water Quality Management Plans for each of their bulk drinking water supply system.

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Esk Water

Name of Source water Water treatment Recipient local council Compliance with Compliance with Boil bulk water reticulation system/s Bacteriological Microbiological Water supply criteria Sampling Alerts system requirements

Distillery St Patricks Coagulation/ flocculation, clarification, Launceston City Council – Yes Yes No Creek River (above filtration, pH adjustment, chlorination, Launceston (Distillery Creek) Nunamara) fluoridation

North Esk North Esk Coagulation/ flocculation, clarification, Launceston City Council – Yes Yes No River (above filtration, pH adjustment, chlorination, Launceston (Chimney Saddle)

Watery Plains) fluoridation George Town Council– George Town/ Hillwood/ Low Head

South Esk South Esk River Coagulation/ flocculation, dissolved air Launceston City Council – Yes Yes No – Trevallyn flotation, filtration, pH adjustment, Launceston (Mt Leslie) Dam chlorination, fluoridation (Mt Leslie Meander Valley Council – Water Treatment Plant) Carrick/Prospect Vale/Hadspen (Carrick is supplied via the reticulation system in Hadspen)

West Tamar South Esk River Coagulation/ flocculation, powdered West Tamar Council – West Yes Yes No – Trevallyn activated carbon, filtration (with Tamar reticulation Dam granular activated carbon), pH adjustment, chlorination, fluoridation (Reatta Rd Water Treatment Plant)

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Overview Population: In total, the Esk Water’s bulk water supply systems provide bulk water for approximately 96 530 people. Treatment: All the bulk water supply systems have various water treatment processes which are applied to the water. Bacteriological

Compliance: All the bulk drinking water supply systems met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004 Boil Water Alerts: None required. Sampling Compliance: Sufficient numbers of microbiological samples were taken for all of Esk Water’s bulk water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines . Drinking Water Quality Management Plans: Esk Water has prepared Drinking Water Quality Management Plans for each of their bulk drinking water supply system. Incident/Events: The Trevallyn Dam which stores the source water for the West Tamar and South Esk bulk water supply systems experienced a blue green algae bloom in January 2007. Subsequently Esk Water introduced activated carbon at their Reatta Rd Water Treatment Plant as an additional water treatment process which would assist in the removal of taste and odour associated with the algal bloom, from the drinking water.

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Hobart Water

Name of Source water Water treatment Recipient local council Compliance with Compliance with Boil catchment reticulation system/s Bacteriological Microbiological Water system criteria Sampling requirements Alerts

Lake Fenton Lake Fenton/ Lady Fluoridation and Chlorination only Derwent Valley Council Yes Yes No Barron Creek (Mt – National

Field National Park) Park/Westerway Glenorchy City Council – Glenorchy reticulation Hobart City Council – Hobart reticulation

Mt Wellington Merton Weir Fluoridation and Chlorination only Glenorchy City Council Yes Yes No (Glenorchy) – Glenorchy reticulation

Mount North West Bay Fluoridation and Chlorination only Hobart City Council – Yes Yes No Wellington River Hobart reticulation (Hobart) Kingborough Council – Kingborough reticulation

River Derwent River Derwent – Coagulation/ flocculation, clarification, Brighton Council – Yes Yes No (upstream of New filtration, pH adjustment, chlorination, Brighton reticulation Norfolk) fluoridation (BRYN ESTYN Water Clarence Council – Treatment Plant) Clarence reticulation

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Derwent Valley Council – New Norfolk Glenorchy City Council – Glenorchy reticulation Hobart City Council – Hobart reticulation

Kingborough Council – Kingborough reticulation Sorell Council – Sorell/ Midway Point/Penna Southern Midlands Council – Campania - Kempton

Overview Population: In total, the Hobart Water’s catchment systems provide bulk water for approximately 197 795 people. The River Derwent catchment system is the largest and supplies approximately 60% of the water in Hobart and greater Hobart. In summer the River Derwent catchment system can provide up to 80% of the drinking water. Hobart Water’s bulk water supply system is complex. The system is composed of each catchment system and 14 pipeline systems which convey and mix water originating from the different catchments so that at any one time water can be wholly from one catchment or a mixture from two or three catchments. Such a system enables Hobart Water to meet consumer demand and provides a high level of contingency for the bulk water supply system. Treatment: Water from all the bulk water supply systems except from the River Derwent system is only chlorinated. No further water treatment process is applied to the water. The River Derwent bulk water supply system has various water treatment processes which are applied to the water.

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Bacteriological Compliance: All the bulk drinking water supply systems met the long term bacteriological standard for drinking water as prescribed in the ADWG 2004 Boil Water Alerts: Hobart Water’s wayside customers (i.e. consumers connected directly to the bulk water pipeline) on the Lake Fenton system, between National Park and Granton, have been issued with a permanent boil water notice despite compliance of this system with the bacteriological standard for drinking water. This precautionary approach has been adopted by Hobart Water as the chlorination process (which is the only water treatment process in this system) has the potential to be ineffective in eliminating all microbiological contaminants during rainfall events in the catchment.

Sampling Compliance: Sufficient numbers of microbiological samples were taken for all of Hobart Water’s bulk water supply systems according to the requirements of the Public Health Act 1997 Drinking Water Quality Guidelines . Drinking Water Quality Management Plans: Hobart Water has prepared Drinking Water Quality Management Plans for each of their bulk drinking water supply system.

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