What's in your tap water?
Contaminant results for every US public water system, from official EPA monitoring — lead and copper, PFAS, radionuclides and more.
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Where the numbers come from
LCR — lead and copper, quarterly compliance samples from EPA SDWIS.
UCMR-5 — PFAS and lithium, the only fresh nationwide measurements (2023–2025).
SYR4 — regulated contaminants from the EPA Six-Year Review, 2012–2019.