Experts and water providers are calling for a ban on 'forever chemicals' known as PFAS, due to increasing environmental harm and expensive removal costs. A Senate inquiry heard that removing PFAS from water supplies and wastewater is becoming increasingly difficult and costly, with treatment costs reaching between $4m and $25m per kilogram. Authorities are also investigating potential links between a 1992 petrol tanker crash and PFAS contamination in two Blue Mountains dams.\NPFAS, which are found in various household and industrial products, are difficult to break down and persist in the environment for long periods. A ban on these chemicals is backed by researchers, who warn of the dangers of replacing them with similarly hazardous alternatives.