Study says drinking water from nearly half of US faucets contains potentially harmful chemicals

Drinking water from nearly half of U.S. faucets likely contains “forever chemicals” that may cause cancer and other health problems, according to a government study released Wednesday.

The synthetic compounds known collectively as PFAS are contaminating drinking water to varying extents in large cities and small towns — and in private wells and public systems, the U.S. Geological Survey said.

Researchers described the study as the first nationwide effort to test for PFAS in tap water from private sources in addition to regulated ones. It builds on previous scientific findings that the chemicals are widespread, showing up in consumer products as diverse as nonstick pans, food packaging and water-resistant clothing and making their way into water supplies.

Because the USGS is a scientific research agency, the report makes no policy recommendations. But the information “can be used to evaluate risk of exposure and inform decisions about whether or not you want to treat your drinking water, get it tested or get more information from your state” about the situation locally, said lead author Kelly Smalling, a research hydrologist.

The U.S. Environmental Protection Agency in March proposed the first federal drinking water limits on six forms of PFAS, or per- and polyfluorinated substances, which remain in the human body for years and don’t degrade in the environment. A final decision is expected later this year or in 2024.

But the government hasn’t prohibited companies using the chemicals from dumping them into public…