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Statement on Rosslynne Reservoir catchment

9 August 2017

Western Water is aware of some recent online conversations about proposed activities by timber business HVP in the catchment area for Rosslynne Reservoir.

A statement on the HVP website regarding this issue details plans for workers to conduct spot application (a small amount applied by hand around each seedling) of granular herbicide, not aerial spraying.

Western Water’s General Manager, Customer and Community Relations, Graham Holt, says providing safe drinking water is paramount to Western Water, and it has a range of measures in place to make sure the drinking water it supplies meets the Australian Drinking Water Guidelines for health and safety.

The guidelines include a framework for managing drinking water systems, including analysing and managing potential risks and hazards.

“The risk assessment process involves looking carefully at every step of the water supply system, from the catchment through to your tap,” Mr Holt says.

Western Water’s drinking water quality monitoring program involves regular testing of samples from the reservoir, the water filtration plant and across the water supply network.

“This includes testing for a broad range of chemicals, a list based on the land use activities in the catchment and potential impacts on the reservoir,” Mr Holt says.

“If any of those chemicals can be detected at certain levels in the reservoir, the water treatment process is designed specifically to remove these chemicals to levels that meet the Australian Drinking Water Guidelines, and further testing is undertaken at the plant.

“We have a range of other measures in place, from visual inspection of the reservoir and banks to boat surveillance and treatment plant audits.”

Mr Holt says Western Water has a Water Quality Risk Management Plan (WQRMP) that is regularly updated and reviewed to make sure both present and possible future risks are being accurately identified and managed.

“We reviewed the plan in November 2016, including doing a flyover of the Rosslynne catchment to visually identify any land use changes,” Mr Holt says.

Treatment of drinking water at the Rosslynne Water Filtration Plant includes filtration, pH correction and disinfection to destroy any bacteria or viruses.


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