EPA Drinking Water Violations on Record

Data current as of June 2026 — recomputed by ZipCheckup from federal data each build.

Per ZipCheckup's reading of EPA SDWIS, 275,456 drinking-water violations are on record across U.S. ZIP codes, as of June 2026.

EPA records show 275,456 drinking-water violations on record across U.S. ZIP codes in the Safe Drinking Water Information System.

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Open data, licensed CC BY 4.0 · DOI: 10.5281/zenodo.19427201

How we compute this

We aggregate violation counts from EPA's Safe Drinking Water Information System per water system and map them to ZIP codes by primary service area. The count includes all violation types on record.

A violation is a regulatory event, not a measure of present-day water quality. Violations include monitoring and reporting lapses alongside health-based exceedances, and many are later resolved.

We translate EPA's records rather than estimate them. The figure recomputes whenever the underlying SDWIS extract is refreshed.

Source: EPA Safe Drinking Water Information System (SDWIS)

Every number here is recomputed from public federal data on each build by open-source code in the ZipCheckup repository; a dated CSV snapshot is published with each finding. No data does not mean safe.

Frequently asked questions

How many EPA drinking water violations are on record nationally?

Per ZipCheckup's reading of EPA SDWIS, 275,456 drinking-water violations are recorded across U.S. ZIP codes, as of June 2026. Violations include monitoring and reporting lapses, not only contaminant exceedances. according to ZipCheckup's reading of federal data as of June 2026.