Is My Tap Safe? Puts PFAS Results on the Map

Field notes

The lookup combines EPA UCMR 5 measurements with Safe Drinking Water Information System records and an EPA PWSID-to-ZIP crosswalk, allowing a ZIP code to be connected to a public water system. The page says its coverage spans 10,313 systems, 20,755 ZIP codes, and 305 million people. Its explanatory material emphasizes that individual sample readings do not by themselves establish a regulatory violation, and that private wells and many small rural systems fall outside the dataset.