Annual Review of Annual Review of Drinking-Water Quality Drinking-Water Quality In New Zealand In New Zealand 2004 2004 National Summary Report National Summary Report Andrew Ball Andrew Ball Chris Nokes Chris Nokes Alan Ferguson Alan Ferguson Jacqui Ritchie Jacqui Ritchie Client Report Client Report FW 0588 FW 0588 Annual Review of Annual Review of Drinking-Water Quality Drinking-Water Quality in New Zealand in New Zealand 2004 2004 National Summary Report National Summary Report Alistair Sheat Alistair Sheat Environmental Health Programme Manager Environmental Health Programme Manager Andrew Ball Jan Gregor Andrew Ball Jan Gregor Project Leader Peer Reviewer Project Leader Peer Reviewer Citation: Ministry of Health. 2004. Citation: Ministry of Health. 2004. Annual Review of the Microbiological and Chemical Quality of Annual Review of the Microbiological and Chemical Quality of Drinking-Water in New Zealand 2004 National Summary Report. Drinking-Water in New Zealand 2004 National Summary Report. Wellington: Ministry of Health. Wellington: Ministry of Health. Published by the Ministry of Health in October 2005 Published by the Ministry of Health in October 2005 PO Box 5013, Wellington, New Zealand PO Box 5013, Wellington, New Zealand ISBN 0-478-29693-2 (Book) ISBN 0-478-29693-2 (Book) ISBN 0-478-29694-0 (Website) ISBN 0-478-29694-0 (Website) HP 4203 HP 4203 This document is available on the Ministry of Health’s website: This document is available on the Ministry of Health’s website: http:// www.moh.govt.nz/water http:// www.moh.govt.nz/water Ministry of Health Disclaimer Ministry of Health Disclaimer The data and analyses contained in the Annual Review of Drinking-Water The data and analyses contained in the Annual Review of Drinking-Water Quality in New Zealand 2004 have been supplied to the Ministry of Health by Quality in New Zealand 2004 have been supplied to the Ministry of Health by the Institute of Environmental Science and Research Limited (ESR). The the Institute of Environmental Science and Research Limited (ESR). The Ministry of Health cannot confirm the accuracy of the data and the analyses and Ministry of Health cannot confirm the accuracy of the data and the analyses and accepts no liability or responsibility for any acts or omissions, done or omitted accepts no liability or responsibility for any acts or omissions, done or omitted in reliance, in whole or in part, on the data or the analyses. in reliance, in whole or in part, on the data or the analyses. All local authorities and bulk water suppliers and relevant government agencies were All local authorities and bulk water suppliers and relevant government agencies were given the opportunity to comment on and check this document for accuracy prior to given the opportunity to comment on and check this document for accuracy prior to publication. The Ministry of Health has endeavoured to ensure that the feedback has publication. The Ministry of Health has endeavoured to ensure that the feedback has been included in this published report. been included in this published report. ESR Disclaimer ESR Disclaimer This report or document (the Report) is given by the Institute of Environmental This report or document (the Report) is given by the Institute of Environmental Science and Research Limited (ESR) solely for the benefit of the Ministry of Science and Research Limited (ESR) solely for the benefit of the Ministry of Health, Public Health Service Providers and other Third Party Beneficiaries as Health, Public Health Service Providers and other Third Party Beneficiaries as defined in the Contract between ESR and the Ministry of Health and is strictly defined in the Contract between ESR and the Ministry of Health and is strictly subject to the conditions laid out in that Contract. subject to the conditions laid out in that Contract. Neither ESR nor any of its employees makes any warranty, express or implied, Neither ESR nor any of its employees makes any warranty, express or implied, or assumes any legal liability or responsibility for use of the Report or its or assumes any legal liability or responsibility for use of the Report or its contents by any person or organisation. contents by any person or organisation. Acknowledgements Acknowledgements The Annual Review of Drinking-Water Quality in New Zealand 2004 National The Annual Review of Drinking-Water Quality in New Zealand 2004 National Summary Report was prepared for the Ministry of Health as part of a contract for Summary Report was prepared for the Ministry of Health as part of a contract for scientific services by Andrew Ball, Chris Nokes, Alan Ferguson and Jacqui Ritchie. scientific services by Andrew Ball, Chris Nokes, Alan Ferguson and Jacqui Ritchie. The authors are very grateful for the efforts of the Health Protection Officers and The authors are very grateful for the efforts of the Health Protection Officers and Local Authority personnel who gathered the data and completed the questionnaire Local Authority personnel who gathered the data and completed the questionnaire forms for this survey and, in particular, to those who took the time to provide useful forms for this survey and, in particular, to those who took the time to provide useful feedback about the questionnaire. feedback about the questionnaire. The care taken by the staff of the Ministry of Health in reviewing the report and The care taken by the staff of the Ministry of Health in reviewing the report and providing valuable comment was also very much appreciated. providing valuable comment was also very much appreciated. All local authorities and bulk water suppliers and relevant government agencies were All local authorities and bulk water suppliers and relevant government agencies were given the opportunity to comment on and check this document for accuracy prior to given the opportunity to comment on and check this document for accuracy prior to publication. The Ministry of Health has endeavoured to ensure that the feedback has publication. The Ministry of Health has endeavoured to ensure that the feedback has been included in this published report. been included in this published report. Annual Review of Drinking-Water Quality in New Zealand 2004 1 Annual Review of Drinking-Water Quality in New Zealand 2004 1 National Summary National Summary Background Background This report covers the third year when the microbiological and chemical quality of This report covers the third year when the microbiological and chemical quality of drinking-water was assessed using the Drinking-Water Standards for New Zealand: drinking-water was assessed using the Drinking-Water Standards for New Zealand: 2000 (DWSNZ:2000). The report is the second in the new format which comprises 2000 (DWSNZ:2000). The report is the second in the new format which comprises the following sections: a general overview of the quality of drinking-water of all the following sections: a general overview of the quality of drinking-water of all supplies within New Zealand; a summary of the nation’s drinking-water quality, with supplies within New Zealand; a summary of the nation’s drinking-water quality, with supplies separated into Local Authority (LA)-operated supplies, school-operated supplies separated into Local Authority (LA)-operated supplies, school-operated supplies and ‘other’-operated supplies; Appendix 1 (showing microbiological and supplies and ‘other’-operated supplies; Appendix 1 (showing microbiological and chemical compliance or non-compliance with the DWSNZ at the level of individual chemical compliance or non-compliance with the DWSNZ at the level of individual water supplies for schools and early childhood centres, Department of Corrections water supplies for schools and early childhood centres, Department of Corrections facilities, Ministry of Defence facilities and hospital/health services); Appendix 2 facilities, Ministry of Defence facilities and hospital/health services); Appendix 2 (supplies that ceased to be monitored in 2004); Appendix 3 (supplies that were (supplies that ceased to be monitored in 2004); Appendix 3 (supplies that were deemed to comply for the second year in a row); and, Appendix 4 (supplies in which deemed to comply for the second year in a row); and, Appendix 4 (supplies in which anomalies occurred between monitoring and surveillance results). anomalies occurred between monitoring and surveillance results). The information on the quality of drinking-water was obtained through the public The information on the quality of drinking-water was obtained through the public health units of the DHBs using questionnaires that sought data concerning health units of the DHBs using questionnaires that sought data concerning surveillance and monitoring programmes carried out by DHBs and water suppliers, surveillance and monitoring programmes carried out by DHBs and water suppliers, respectively. Water suppliers fall into two groups: LAs, including commercial water respectively. Water suppliers fall into two groups: LAs, including commercial water supply companies contracted by LAs, and private organisations or communities supply companies contracted by LAs, and private organisations or communities responsible for the operation of their own drinking-water supplies, of which schools responsible for the operation of their own drinking-water supplies, of which schools have been considered separately. Water suppliers are responsible for water quality have been considered separately. Water suppliers are responsible for water quality monitoring, whereas