
If you’re wondering whether or not your tap water might contain synthetic chemicals known as PFAS, nonprofit Environmental Working Group created an interactive map using official records and data from public drinking water systems to show where forever chemicals were found to be above and below the advised maximum concentration level, 4 parts per trillion (PPT).
EWG notes that while researchers used the highest quality data available, contamination levels are based on a single point in time and may not reflect changes to the water system or treatment efforts.
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 in July.