May 28, 2026 / 6:42 AM EDT

/ CBS/AP

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Melbourne, Australia — Australia is suing U.S. conglomerate 3M for more than 2 billion Australian dollars ($1.4 billion) over so-called "forever chemical" contamination from firefighting foam at defense bases, the government said on Thursday.The government's largest-ever claim for compensation relates to contamination with per- and polyfluoroaklyl substances, known as PFAS, at 28 bases. Human-made PFAS are commonly referred to as "forever chemicals" because they don't break down naturally.They are increasingly being restricted across the world due to their adverse health effects. Australia filed the suit in the Federal Court of Australia against Minnesota-based 3M Company and its subsidiary 3M Australia. 3M said it would fight Australia's claim. "3M has never manufactured PFAS in Australia and ceased sales of the products at issue in Australia around two decades ago," 3M said in a statement. "Despite this, the (Australian) Department of Defense continued to use PFAS-containing firefighting foams for nearly two decades longer." PFAS have been used since the 1950s in household and industrial products that resist heat, stains, grease and water. The firefighting foam containing PFAS was effective against fuel fires.