ZIP Codes With Unresolved Water Violations
Data current as of June 2026 — recomputed by ZipCheckup from federal data each build.
Per ZipCheckup's reading of EPA SDWIS, 15,468 U.S. ZIP codes have at least one unresolved drinking-water violation, as of June 2026.
EPA records show 15,468 ZIP codes with at least one unresolved drinking-water violation across the United States.
Open data, licensed CC BY 4.0 · DOI: 10.5281/zenodo.19427201
How we compute this
We map EPA Safe Drinking Water Information System (SDWIS) violations to ZIP codes by primary service area and count the ZIP codes with at least one violation whose return-to-compliance status is not yet recorded. The figure recomputes with each SDWIS extract.
An unresolved status is a regulatory record state, not a real-time measure of water quality. Many violations are monitoring or reporting lapses, and resolution can lag the underlying corrective action.
We translate EPA’s records rather than estimate them. A ZIP code counts once if any of its mapped systems carries an unresolved violation.
Frequently asked questions
How many ZIP codes have unresolved EPA water violations?
Per ZipCheckup's reading of EPA SDWIS, 15,468 U.S. ZIP codes have at least one unresolved drinking-water violation, as of June 2026. Unresolved is a regulatory record state, not a real-time water-quality reading. according to ZipCheckup's reading of federal data as of June 2026.