tapwatermap.com

Search TapWaterMap for US cities by name.

Fetch the full plain-English EPA tap-water record for a city id (e.g.

Find covered US cities by name, optionally within a state.

The core tool: what the EPA has on record for a city's tap water — the active community water systems serving it, populations, sources, and violations (contaminant, health-based or not, dates, status, level vs limit when recorded).

EPA record for a single water system by its PWSID (e.g.

List all covered cities in a state (with violation counts).

Filter/rank cities across the dataset — e.g.

Compare the EPA records of several cities side by side.

Plain-English explanation of an EPA contaminant by name or code: the EPA name, whether the EPA classifies it as health-based, and how often it appears in our records.

What TapWaterMap covers: states, cities, total EPA violation records, and the data quarter/date.