WaterNSW says PFAS levels in Sydney’s dams are “negligible”, excluding Medlow Dam.

WaterNSW says recent testing of raw water in Sydney’s dams shows negligible levels of PFAS, except for the isolated Medlow Dam in the Blue Mountains. 

The results align with previous assessments by Sydney Water, which reported that the city’s drinking water continues to meet Australian Drinking Water Guidelines and is safe for consumption.

The primary focus of WaterNSW’s investigation remains the elevated PFAS levels identified at the Cascades Water Treatment Plant. 

The investigation includes thorough testing of water sources and soil within the Blue Mountains catchment area. 

Over 100 samples from 30 different sites have been analysed, targeting both surface and deep water across various locations.

One area of particular interest is Adam’s Creek, a small tributary feeding Medlow Dam, where investigations have been intensified. 

WaterNSW is also collaborating with government agencies to examine historical land use that might have introduced PFAS into the area, especially from activities such as firefighting.

To safeguard Sydney’s water supply, WaterNSW has temporarily disconnected Medlow and Greaves Creek Dams from the water supply system. 

The agency says it is taking steps to better understand PFAS contamination pathways and explore mitigation strategies.

The investigation is ongoing, with WaterNSW assuring the public that they are working closely with Sydney Water and NSW Health to maintain the safety of the region’s drinking water.

Monitoring and testing results are available here. 

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