Water quality

We provide world-standard, high-quality, safe drinking water for our customers.

In accordance with the Safe Drinking Water Act 2003, we have a water quality risk management plan in place to ensure drinking water meets quality standards. We also maintain a Hazard Analysis and Critical Control Points (HACCP) certified drinking water quality management system, covering the entire water supply system from catchment to taps.

If you have questions or concerns about your drinking water, please contact us.

Intended Use

Drinking water supplied by Barwon Water must meet obligations under the Safe Drinking Water Act 2003 and corresponding regulations. The intended use of drinking water supplied by Barwon Water is:

  • immediate consumption by the public, with no further treatment or boiling by the consumer necessary for it to reasonably be considered safe and of good quality
  • other domestic and commercial uses where the requirements for these other applications do not exceed our government obligations
  • not intended for immediate consumption by immune-compromised or other high-risk groups

In supplying drinking water, Barwon Water considers the latest developments in drinking water quality research and Australian best practice for operating water supply systems.

Drinking water supplied by Barwon Water must meet strict water quality standards as per the Safe Drinking Water Regulations 2015 and Australian Drinking Water Guidelines (ADWG).

The ADWGs “take account of the needs of an individual through a normal lifetime, including changes in sensitivity that may occur between life stages” and recommend that “sensitive sub-populations (including those who are severely immuno-compromised) should seek further medical advice”.

Annual Drinking Water Quality Report

We publish an Annual Drinking Water Quality Report that provides an overview of our supply system, our risk management processes, and water quality performance for the financial year.

Water quality testing

To maintain quality throughout our entire water supply system, we employ an independent, NATA-accredited laboratory to undertake comprehensive quality testing.

As part of this testing, we monitor our:

  • water sources (such as rivers, creeks, reservoirs and aquifers),
  • treated water at our treatment plants, and
  • distributed water through our network of tanks, basins and pipes, and at customers’ taps.

Our water is measured against a range of parameters to ensure quality and safety, including:

  • microbes
  • disinfection by-products
  • treatment by-products
  • fluoride
  • turbidity
  • hardness
  • colour
  • pH
  • electrical conductivity
  • pesticides
  • heavy metals

Water quality results

Water quality issues

We’re lucky to have some of the most pristine catchments in Australia, however, customers may occasionally experience issues with their water quality. While these issues may affect the appearance, taste or odour of your water, most pose no health risks.

Discoloured looking water

Unusual tastes or odours

The way we perceive tastes and odours in food and drink is very complex and completely personal. For example, it might depend on what food and drink you have consumed that day, if you add salt to your diet, or even if you are wearing perfume or aftershave.

We have five different tastes: salty, sweet, bitter, sour and umami (savoury). We perceive other flavours through receptors in our nose, rather than our mouth and tongue. This is why you usually find it easier to swallow unpleasant medicines while holding your nose.

Water hardness

Water hardness is a measure of naturally occurring calcium and magnesium dissolved in water.

Water across our region is generally considered ‘soft’ and poses no scaling problems.

There is no need to use water softeners in dishwashers or washing machines.

Making our water safe

We source our drinking water from the natural environment which is also home to a wide range or microscopic organisms (micro-organisms). While most micro-organisms are harmless, some can be unsafe for human consumption. We treat your drinking water to ensure no harmful organisms (pathogens) reach your tap.

Good plumbing practices for households

Metals such as lead, copper, nickel and iron used in the manufacture of plumbing fixtures can dissolve into drinking water, particularly where water has been sitting in contact with these plumbing products for long periods of time.

Due to the heating process, hot water systems can result in more dissolved metals in water compared with cold water systems.

Rainwater systems can also dissolve more metals from plumbing products as the slight acidity of rainwater can make rainwater corrosive to plumbing.

Householders can proactively reduce their potential exposure to metals in drinking water through the following measures:

  • using water from cold taps for drinking and cooking
  • flushing cold water taps used for drinking and cooking for about 30 seconds first thing in the morning to draw fresh water through the tap
  • flushing cold water taps used for drinking and cooking for about 2 to 3 minutes after long periods of non-use, such as return from holidays (‘flushed’ water can be collected and used for washing up or water in the garden)
  • when renovating or building, choose low lead or lead free plumbing products certified to WaterMark and AS/NZS 4020:2005
  • always use a licenced plumber.

Fluoride

We add fluoride to our drinking water to prevent dental decay, as directed by the Victorian Department of Health and endorsed by the National Health and Medical Research Council (NHMRC).

The Geelong and Colac regions’ water supplies have been fluoridated since 2009 and 2010, respectively. Birregurra’s water supplies have been fluoridated since late 2024, when it was connected to the Colac system. Other supply areas are not currently connected to a fluoridated supply.

The addition of fluoride to our drinking water is carefully controlled and monitored, and doesn’t change its taste, smell or colour. Fluoride is added to an optimum dosage of 0.9 parts per million (0.9 milligrams per litre) as declared by the Department of Health and recommended by NHMRC.

For more information, please contact the Department of Health.

We are currently undertaking important upgrade works at the Wurdee Boluc Clear Water Storage, which supplies drinking water to most of Geelong and the Bellarine Peninsula. During this time, fluoride will not be added to the drinking water supply.

Fluoride dosing was switched off when works commenced in May 2025, and is expected to remain offline until the second half of 2025. Once the works are complete, fluoride dosing will recommence in line with the Victorian Health Department’s Code of Practice for Fluoridation of Drinking Water Supplies.

These works will not impact the supply of water to your property, water pressure, or the quality of the drinking water we provide.

We are committed to keeping our customers informed and will update this page as the project progresses.

Perfluoroalkyl and polyfluoroalkyl substances (PFAS)

Per- and ployfluoroalkyl substances (PFAS) are a group of human-made chemicals that have been widely used in industrial and consumer products since the mid-1900s. Due to their widespread use these are now found widespread in the environment.

Barwon Water sample and test for PFAS and have not detected any PFAS in our treated drinking water.

After water is treated at our plants, it travels in a closed system to customers’ water meters to protect the quality of the water.

The Australian Drinking Water Guidelines (ADWG) provide health-based values for how much of a substance a person can consume over their lifetime, without any increased risk to their health. The values are very conservative, and include a range of uncertainty factors, which always err on the side of caution, to ensure public health.

On 21 October 2024 the National Health and Medical Research Council released updated draft Australian Drinking Water Guidelines (ADWG) values for four types of PFAS chemicals in Australian drinking water.

The draft guidelines propose to lower the levels for three types of PFAS in the current guidelines (PFOS, PFOA, PFHxS) and add a new level for an additional PFAS chemical – PFBS.

For more information on the draft guidelines, please visit NHMRC’s website.

Protecting our catchments

Our drinking water is harvested from protected catchments. Maintaining the health of these catchments is crucial in ensuring we’re providing our community with high-quality, safe drinking water.