The drinking water we supply is of excellent quality and is regularly tested to make sure it remains this way.
We consistently meet water quality health standards set by the Department of Health (DoH).
We are one of Australia’s largest water suppliers delivering around 363 billion litres of high-quality drinking water from 82 drinking water dams and weirs, 144 licensed borefields and 2 major desalination plants to over 1.29 million properties through 34,680 km of water mains.
Managing our drinking water quality
To deliver safe drinking water, we run an extensive water quality monitoring program. We base our performance on more than 68,000 samples from water sources, treatment plants and pipe networks that supply our customers, and over 255,600 individual analyses performed by independent laboratories.
We also have a Drinking Water Quality Policy and a Water Source Protection Policy, which set out our commitments in supplying safe, high quality drinking water to our customers and protecting our water catchments.
In 2017, an independent review of our Drinking Water Quality Management Performance found that:
- our internal standards reflect the Australian Drinking Water Guidelines and DoH requirements
- our management system is effectively used for managing and reporting in accordance with our internal standards and external reporting requirements
- we understand the inherent value of and have committed to protecting drinking water at the source and continuously improve our methods and practices for managing source protection
- our management framework reflects strong reporting and monitoring, good resourcing of management structure, established and maintained procedures and a strong commitment to monitoring and achieving compliance with DoH requirements.
What is in our drinking water?
We add chlorine to all our water supply schemes. Chlorine is used as a disinfectant which provides lasting, effective protection from the water treatment plant to your tap. It is especially effective where long pipelines and high water temperatures increase the potential for growth of harmful organisms in our water.
Fluoride is added to some water supply schemes to improve dental health, as directed by the Department of Health (DoH). The use of fluoride is regulated by the Fluoridation of Public Water Supplies Act 1966, and the dose rate is set by a steering committee which reports to the Minister for Health. For a complete list of the towns where we fluoridate the drinking water supply please see the Drinking Water Quality Annual Report.
For more information about the DoH’s directive on fluoridation, visit the Department of Health’s website or call 08 9222 2000.
Who regulates our drinking water quality?
The DoH regulates drinking water quality in Western Australia. Our Memorandum of Understanding for Drinking Water with DoH enables the department to audit our water quality, management and reporting systems to ensure we consistently comply with Australian Drinking Water Guidelines. Compliance with the Memorandum of Understanding is also a requirement of our Water Services Licence, which is issued by the Economic Regulation Authority.
Schedules 4 to 9 of the Memorandum of Understanding contain lists of substances and materials that may or may not be used in contact with drinking water. These schedules are now available from the Department of Health website.
How do we report on our performance?
Our Drinking Water Quality Annual Report for 2017–18 provides a detailed overview of our water quality performance. We produce this report in line with the requirements of our Water Services Licence, our Memorandum of Understanding for Drinking Water with the Department of Health and the Australian Drinking Water Guidelines.
Drinking Water Quality Annual Report 2017-18
Water quality data tables by region