Groundwater by state
Naturally occurring contaminants track local geology, not state lines. State-level USGS research is still the most specific public data most well owners can look up. These pages summarize known regional patterns. None of it predicts your individual well.
MaineNew HampshireVermontMassachusettsConnecticutRhode IslandNew YorkPennsylvaniaNew JerseyDelawareMarylandVirginiaWest VirginiaNorth CarolinaSouth CarolinaGeorgiaFloridaAlabamaMississippiTennesseeKentuckyOhioIndianaMichiganWisconsinIllinoisMinnesotaIowaMissouriNorth DakotaSouth DakotaNebraskaKansasOklahomaTexasMontanaWyomingColoradoNew MexicoArizonaUtahNevadaIdahoWashingtonOregonCaliforniaAlaskaHawaii