For decades, a little-known company now owned by a Goldman Sachs fund has been making millions of dollars from the unlikely dregs of American life: sewage sludge. Synagro, sells farmers treated [sewage] sludge from factories and homes to use as fertilizer. But that fertilizer, also known as biosolids, can contain harmful "forever chemicals" known as PFAS linked to serious health problems including cancer and birth defects. Farmers are starting to find the chemicals contaminating their land, water, crops and livestock. Just this year, two common types of PFAS were declared hazardous substances by the Environmental Protection Agency under the Superfund law. Now, Synagro is part of a major effort to lobby Congress to limit the ability of farmers and others to sue to clean up fields polluted by the sludge fertilizer. In a letter to the Senate Committee on Environment and Public Works in March, sludge-industry lobbyists argued that they shouldn't be held liable because the chemicals were already in the sludge before they received it and made it into fertilizer. [Synagro's] earnings hit $100 million to $120 million last year. An investment fund run by Goldman Sachs ... acquired Synagro in 2020 in a deal reported to be worth at least $600 million. As concerns over PFAS risks have grown, Synagro has stepped up its lobbying. Chemical giants 3M and DuPont, the original manufacturers of PFAS, for decades hid evidence of the chemicals' dangers. The chemicals are now so ubiquitous ... that nearly all Americans carry PFAS in their bloodstream. As many as 200 million Americans are exposed to PFAS through tap water.