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Such chemicals are found in everyday appliances, from non-stick pans to clothing, insecticides and food packaging. Sydney Water testing conducted in June and published online without further notification shows one group of Pfas chemicals was found in filtered water from Warragamba, albeit on the cusp of detectable levels. Water filtration plants at Katoomba and Blackheath in the Blue Mountains had the highest results at about 30 nanograms a litre of perfluorooctane sulfonic acid Pfos and perfluorohexane sulfonic acid PFHxS.
Each result was below Australian drinking water standards. However, those guidelines have been criticised as being out-of-date.
The United States recently set an enforceable threshold of four nanograms a litre, on the cusp of current detection levels. The published results did not surprise or alarm Pfas expert and University of Sydney head of civil engineering Professor Stuart Khan. The same chemicals were in household dust, clothing, food and food packaging such as plastic-covered paper, Khan said. Khan also predicted that as scientific instruments became more sensitive, discoveries would be made in the Sydney catchments where Pfas was currently undetectable: Illawarra, Macarthur, Woronora and Nepean.
The results will pressure authorities to bring drinking water guidelines into line with those set by the US Environmental Protection Agency. That agency in April took a hard-line approach to the chemicals in drinking water, setting health-based goals to reduce exposure to zero and forcing water authorities to publicise Pfas levels and clean up contaminated supplies.
