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According to Australian media reports on the 20th, the Sydney Water Authority detected per- and polyfluoroalkyl substances (PFAS), known as "permanent chemicals", in water samples from multiple drinking water catchments in the Greater Sydney area. However, local authorities stated that Sydney's water is safe.

Sydney Water recently published on its website the results of water quality sample tests conducted in June this year at water treatment plants in several major catchment areas in the region. PFAS was detected in water samples from six water treatment plants, and high levels of perfluorooctane sulfonic acid (PFOS) and perfluorohexane sulfonic acid (PFHxS) were found in water samples from two water treatment plants.

According to reports, the content of the above substances does not exceed the current Australian drinking water regulations, but is higher than the US standard. Sydney Water said that Sydney's water is safe. The New South Wales Health Department, where Sydney is located, also said that Sydney's water is safe and relevant agencies will continue to monitor the quality of drinking water.

PFAS are difficult to degrade and will accumulate in the environment and human body, and are known as "permanent chemicals". Studies have shown that exposure to these chemicals may be associated with cancer, liver and heart damage, and impaired immunity and development in infants and children.