Important information The Millstream Water Reserve drinking water source protection plan (2010, WRP no.116) was reviewed during the 2017–18 financial year. Please ensure you read the Millstream Water Reserve drinking water source protection review (2018, WRP no.178) alongside the 2010 plan to obtain all of the information about this drinking water source. The 2018 review considers changes that have occurred in and around the Millstream Water Reserve since 2010. An assessment of previous recommendations has been done and additional recommendations have been prepared to ensure the ongoing protection of this source, including: reducing the water reserve boundary under the Country Areas Water Supply Act 1947 updating the protection zones to reflect the existing production bores. You can find the 2018 Millstream Water Reserve drinking water source protection review at www.dwer.wa.gov.au or by contacting the Department of Water and Environmental Regulation on +61 8 6364 7000 or [email protected]. Government of Western Australia Department of Water MillstreamMillstream WaterWater ReserveReserve Drinking water source protection plan West Pilbara water supply Looking after all our water needs Water resource protection series Report WRP 116 June 2010 Millstream Water Reserve drinking water source protection plan West Pilbara integrated water supply scheme Looking after all our water needs Department of Water Water resource protection series Report No. 116 June 2010 Department of Water 168 St Georges Terrace Perth Western Australia 6000 Telephone +61 8 6364 7600 Facsimile +61 8 6364 7601 www.water.wa.gov.au © Government of Western Australia 2010 June 2010 This work is copyright. You may download, display, print and reproduce this material in unaltered form only (retaining this notice) for your personal, non- commercial use or use within your organisation. Apart from any use as permitted under the Copyright Act 1968, all other rights are reserved. Requests and inquiries concerning reproduction and rights should be addressed to the Department of Water. ISSN 1326-7442 (print) ISSN 1835-3924 (online) ISBN 978-1-921736-64-3 (print) ISBN 978-1-921736-65-0 (online) Disclaimer This document has been published by the Department of Water. Any representation, statement, opinion or advice expressed or implied in this publication is made in good faith and on the basis that the Department of Water and its employees are not liable for any damage or loss whatsoever which may occur as a result of action taken or not taken, as the case may be in respect of any representation, statement, opinion or advice referred to herein. Professional advice should be obtained before applying the information contained in this document to particular circumstances. Acknowledgements The Department of Water would like to thank the following for their contribution to this publication: Chris Stanley, Darryl Abbott, Carl Dyde, Stephen Watson and Nigel Mantle (Department of Water); Nathan Conley (Water Corporation); and Brian Barnett (Sinclair Knight Mertz). For more information about this report, contact the Water Source Protection Branch on +61 6364 7600 or [email protected]. Cover photograph: Crossing Pool (Photo: C. Stanley) Water resource protection series report no. 116 Millstream Water Reserve drinking water source protection plan Contents Preface ........................................................................................................................ v Summary ................................................................................................................... vii 1 Drinking water source overview ............................................................................ 1 1.1 Existing water supply system ......................................................................................... 1 1.2 Water treatment ............................................................................................................. 1 1.3 Catchment details .......................................................................................................... 2 1.3.1 Physiography ....................................................................................................................... 2 1.3.2 Climate ................................................................................................................................. 2 1.3.3 Hydrology/hydrogeology ...................................................................................................... 3 1.4 Future water supply requirements ................................................................................. 3 1.5 Existing drinking water source protection ...................................................................... 4 1.6 Department of Water management ................................................................................ 4 1.6.1 Current allocation licence ..................................................................................................... 4 1.6.2 Pilbara regional water plan................................................................................................... 5 1.6.3 Pilbara Coast water study .................................................................................................... 5 1.6.4 Pilbara water in mining guidelines ........................................................................................ 5 1.6.5 Pilbara integrated water supply: pre-feasibility study ........................................................... 6 1.6.6 Millstream status report ........................................................................................................ 6 2 Water quality monitoring and contamination risks ................................................. 7 2.1 Microbiological ............................................................................................................... 7 2.2 Health related ................................................................................................................ 8 2.3 Aesthetic ........................................................................................................................ 9 2.4 Groundwater bores ........................................................................................................ 9 3 Land-use assessment ......................................................................................... 10 3.1 Existing land uses and activities .................................................................................. 10 3.1.1 National park ...................................................................................................................... 10 3.1.2 Water supply reserve (reserve 38991) ............................................................................... 11 3.1.3 Crown leases ..................................................................................................................... 12 3.1.4 Aboriginal sites of significance ........................................................................................... 13 3.1.5 Native title .......................................................................................................................... 14 3.2 Proposed land uses and activities ............................................................................... 14 4 Catchment protection strategy ............................................................................ 23 4.1 Protection objectives .................................................................................................... 23 4.2 Proclaimed area........................................................................................................... 23 4.3 Priority areas ............................................................................................................... 24 4.4 Protection zones .......................................................................................................... 25 4.5 Land-use planning ....................................................................................................... 25 4.6 Best management practices ........................................................................................ 26 4.7 Surveillance and by-law enforcement .......................................................................... 26 4.8 Emergency response ................................................................................................... 27 4.9 Implementation of this plan .......................................................................................... 27 5 Recommendations .............................................................................................. 28 Appendices ................................................................................................................ 30 List of shortened forms .............................................................................................. 72 Department of Water iii Millstream Water Reserve drinking water source protection plan Water resource protection series report no. 116 Glossary .................................................................................................................... 73 References ................................................................................................................ 77 Appendices Appendix A Figures .................................................................................................. 30 Appendix B Water quality data ................................................................................