Water and Sanitary Services Assessment
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Water and sanitary services assessment Wairoa District Council Water and Sanitary Assessments Review 2015 Prepared By _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Linda Cook Consultant Engineer (Wairoa District Council) Approved By _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Jamie Cox Engineering Manager (Wairoa District Council) Date: July 2015 Status: Final Draft for audit Peer Review This document was independently peer reviewed by David Fraser of AMSAAM Ltd, who is an acknowledged expert in infrastructure asset management Wairoa District Council Water & Sanitary Services Assessment 2015 EXECUTIVE SUMMARY Introduction Under the LGA 2002 Amendment Bill No.3, Section 125 of the LGA 2002 states that ‘A Territorial Authority must, from time to time, assess the provision within its District of a) Water supply b) Other sanitary services’ The Local Government Act 2002 Amendment Bill (No.3) inserts a new section 126 which outlines the purpose of the assessments as: ‘to assess, from a public health perspective, the adequacy of water and other sanitary services available to communities within a territorial authority’s district, in light of— (a) the health risks to communities arising from any absence of, or deficiency in, water or other sanitary services; and (b) the quality of services currently available to communities within the district; and (c) the current and estimated future demands for such services; and (d) the extent to which drinking water provided by water supply services meets applicable regulatory standards; and (e) the actual or potential consequences of stormwater and sewage discharges within the district’ This assessment is an update of the 2005 Water and Sanitary Services Assessment in light of changes in legislation, changes in levels of service and also changes in the Wairoa District. Progress since 2005 Assessment A number of recommendations and proposals were made in the 2005 Water and Sanitary Services Assessment. Council has made significant progress in implementing these actions. Some key areas of progress are outlined in the table below: 2005 WSSA PROPOSAL STATUS 2015 WATER SUPPLY Where a lack of alternative sources of supply Options for the Mahanga supply continue to be combined with density of development bring about considered or cause to bring about a risk to public health through lack of water potability then communal Funding has been applied for in relation to treatment and reticulation systems shall be investigations into treatment options provided Further to community feedback, a referendum will be made prior to any final decision as to Council will monitor growth in the District, with whether to upgrade or decommission the supply particular regard given to the Mahia Peninsula Tuai supply has been upgraded to meet If there is deemed to be a deficiency in the water drinking water standards supply that results in a public health risk then Council will investigate the provision of a Contingency / resilience planning includes an reticulated system or explore other suitable investigation of alternative supply provisions for options Wairoa, currently dependent on one supply source Provision has been made, in the next 10 to 20 years, to investigate and implement, as appropriate, a public water supply for Mahia Executive Summary i Wairoa District Council Water & Sanitary Services Assessment 2015 2005 WSSA PROPOSAL STATUS 2015 Problems resulting in a lack of supply capacity will Levels of service and performance measures / be addressed so that affected customers have a targets have been strengthened in the 2015 service that is reliable and able to meet the Asset Management Plan requirements of domestic/commercial/industrial use and fire fighting WASTEWATER The provision of additional treatment to the Wairoa Complete wastewater system The upgrading of the Tuai wastewater system Complete Complete CCTV inspection of reticulated network Ongoing with specific condition monitoring and determine maintenance and renewal budgets in 2015 AMP / LTP to determine most requirements effective renewals programme. Implement measures to minimise overloads and Ongoing as part of infiltration and inflow contamination caused by cross connections, investigations and remedial works (provision in stormwater infiltration to sanitary sewers and 2015 LTP and AMP) flooding of sewage pump stations Investigate treatment options for existing and new Mahia and Opoutama wastewater treatment developments in the future systems now in operation Feasibility study underway for the Wairoa Treatment Plant Upgrade / Replacement required as current discharge consent expires in 2019 STORMWATER Determine and implement a program to collect Ongoing with specific condition monitoring detailed data for stormwater assets (eg condition) budgets in 2015 AMP / LTP to determine most effective renewals programme Continue CCTV inspection of reticulated network and determine maintenance and renewal requirements Implement measures to minimise stormwater contamination Implement capital and renewal works programme To be developed from condition assessments / to mitigate peak flows and adverse effects of monitoring stormwater runoff Protection and classification of overland flowpaths Part of asset data collection programme (refer as public drains Improvement plan in 2015 Stormwater AMP) CEMETERIES Development within the Wairoa, Nuhaka and Ongoing Ruakituri cemeteries on an as needed basis Pursue the needs identified for a cemetery in Provision made in 2015 AMP and LTP Mahia (deferred) Continue to identify burial sites that are at risk As identified from coastal erosion PUBLIC TOILETS Council will continue to monitor demand within Ongoing the district, and particularly in the Mahia area Facility upgrades identified in 2015 AMP / LTP Develop an Asset Management Plan for the Included in 2015 Parks and Reserves AMP management of public toilets Executive Summary ii Wairoa District Council Water & Sanitary Services Assessment 2015 Summary of 2015 Assessments Between 1996 and 2013, the population in Wairoa fell from 9,900 to 7,890 indicating a steady decline over this period (average of 120 people per year with 591 or 7% drop between the Census in 2006 and that in 2013). It is predicted that this decline will continue. However, it is unlikely that the levels of service required will reduce. Continued maintenance of assets to support activities will be required, legislation will change and community expectations will change with time. Safe drinking water is a fundamental requirement for everyone. To ensure this, careful management of community water supplies and wastewater discharge processes will be required - in particular, in areas where development has occurred on unconsolidated sediments and unconfined aquifer systems as the conflicting resource uses in these areas can present a public health risk. The tables below summarise the adequacy of the water and other sanitary services provided by Wairoa District Council in relation to the purpose of the assessment as set out in section 126 of the Local Government Act. WATER SUPPLY Section 126, sub-section Adequacy in Wairoa (a) the health risks to It is unrealistic to expect all population centres in the Wairoa communities arising from District to be serviced by a public water supply network. Much of any absence of, or the population is rural or in small clusters / settlements. deficiency in, water or other sanitary services It is noted that some communities such as the Mahia Heights Subdivision as well as some schools, recreational / tourist facilities and marae have implemented their own network / community supply. Whilst it is recognised that there are always health risks associated with the absence of a publicly managed system, the cost-benefit has to be assessed. Many small communities, for example, would be unable to fund (through rates) the construction and ongoing maintenance and operation of a public service. In these cases, Council continues to provide education and enforcement of water supply requirements for any new development through building consents. In terms of the existing services provided by Council, they are considered adequate in relation to health risks; all have Water Safety Plans (or Public Health Risk Management Plans). Whilst currently ungraded, all comply with the Drinking Water Standards (Tuai supply recently upgraded) The health risk to Wairoa, being the largest population centre in the District, would have the potential to be high if water could not be treated by or distributed from the Wairoa Treatment Plant. Provision has been made to investigate an alternative / second source for Wairoa to address this. At Mahia Beach, where there is a stable population throughout the year with a significant increase over the summer period, investigations are to be undertaken to develop a public network. Water services provided by Wairoa are considered adequate in terms of health risks associated with the absence of or deficiencies in the water services. (b) the quality of services Requirements in terms of quality are largely set by levels of currently available to service agreed through the Long Term Plan process. These are communities within the largely related to the provision of a prompt and efficient service. Executive Summary iii Wairoa District Council Water & Sanitary Services Assessment 2015 WATER SUPPLY Section 126, sub-section Adequacy in Wairoa district For each level of service, performance measures and annual targets are set which are a measure of the quality of the service provided by Council. Annual surveys, undertaken