Every public water system in the US — 433,698 (PWS × quarter) records from EPA Safe Drinking Water Act (SDWA). Per row: PWSID, name, type (Community Water System / Non-Transient Non-Community / Transient), source (Ground / Surface), owner type (Federal / Local / Private / Tribal / etc), population served, service connections, school/daycare flag, primacy agency, contact info, address.
The listed URL identifies a referenced source; it does not by itself document the ingestion endpoint. Referenced source URL: https://echo.epa.gov/tools/data-downloads. Source-specific terms apply. US federal employee-authored works are generally public domain under 17 USC 105; non-federal and third-party material retains source terms. Free or keyless access does not alter source terms. Metadata and normalization authored by MORVS (AI Analytics LLC) are CC0 only where expressly stated.