Drinking water quality

The drinking water we supply is of excellent quality and is regularly tested to make sure it remains this way.

In 2016-17 we met 100% of the water quality health standards set by the Department of Health (DoH).

We are one of Australia’s largest water suppliers delivering around 360 billion litres of high-quality drinking water from 128 drinking water dams and weirs, 94 licensed borefields and 2 major desalination plants to over 1.2 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 66,000 samples from water sources, treatment plants and pipe networks that supply our customers, and over 250,000 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 2012, an independent review of our Drinking Water Quality Management Performance found that:

  1. our internal standards reflect the Australian Drinking Water Guidelines and DoH requirements
  2. our management system is effectively used for managing and reporting in accordance with our internal standards and external reporting requirements
  3. our management framework reflects strong reporting and monitoring, good resourcing or 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 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. 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.

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 Operating 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 2015–16 provides a detailed overview of our water quality performance. We produce this report in line with the requirements of the Australian Drinking Water Guidelines, our Operating Licence requirements, the requirements of the Memorandum of Understanding and the reporting requirements of the National Water Commission.

To provide feedback on this report please email report@watercorporation.com.au

Drinking Water Quality Annual Report 2016-17

Water quality data tables by region