About PlainWater

PlainWater provides free, searchable access to drinking water quality data from the U.S. Environmental Protection Agency's Safe Drinking Water Information System (SDWIS) and the Fifth Unregulated Contaminant Monitoring Rule (UCMR5) program.

Our database covers over 143,000 active public water systems across all 50 states, territories, and tribal lands. We track violation history, health-based violations, and PFAS "forever chemical" testing results.

Data Sources

• EPA SDWIS — Safe Drinking Water Information System, quarterly bulk data from EPA's ECHO program
• EPA UCMR5 — Fifth Unregulated Contaminant Monitoring Rule, PFAS testing data (2023-2025)

Disclaimer

PlainWater is not affiliated with the EPA or any government agency. Data is provided for informational purposes only. Always consult your local water utility for the most current water quality information.