National · EPA UCMR 5 Data · Educational Tool
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Check for PFAS in your water system
PFAS are chemical pollutants. Enter your ZIP code to find available test results for public water systems in your area.
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Find your water provider. A ZIP code may list several systems. Match the name to your water bill. Private wells are not included. Use a private well? Find testing guidance →
Preparing verified EPA data.
PFAS Public Water Monitoring Report
This report lists public water systems linked to the entered ZIP. It summarizes a fixed research snapshot of EPA results received through January 15, 2026. Each system card shows when EPA collected its samples. A result below an EPA reporting level does not mean the concentration was zero or that the compound was absent.
About this independent research
PFAS Estimator helps people find and read EPA public-water monitoring data. It was built by Jack Zhang in Los Gatos, California. Joshua Tamayo-Sarver, MD, PhD, provided early feedback on clinical framing and limitations.
The archived data and code are public, and automated internal checks are in place. The analysis has not yet been independently reproduced or peer reviewed.
Read the methods and limitations → · View archived data and code (DOI) → · Contact Jack
Independent research and education tool · Methods and limitations · Archived data and code · Current EPA data