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FreeResearchUnited States, North America
EWG Tap Water Database (2025 Edition)
Water quality data from nearly 50,000 U.S. water systems identifying 324 contaminants including PFAS. Updated February 2025.
ewg.org
At a glance
- Region
- United States (North America)
- Coverage
- 50,000 water systems
- Access
- Free
- Category
- Research
- Last updated
- 2025
What's inside
- Drinking Water Quality
- Contaminants
- PFAS
What you can do with it
Typical work that data of this type supports.
- 01
Hotspots and trends
Find where contamination is high and whether it is getting worse.
Because it has: Drinking Water Quality
- 02
Compliance checks
Compare samples against drinking water and discharge standards.
- 03
Coverage gaps
Find who lacks safe water or sanitation.
Where AI adds value
Ideas for machine learning and AI agents built on this kind of data.
- 01
Risk maps
Predict contamination where no samples exist, from geology, land use and climate.
- 02
Anomaly alerts
Catch sudden spikes in sensor or lab data automatically.
- 03
Failure prediction
Predict pipe bursts and plant failures before they happen.
Related water data
- USGS PFAS in U.S. Tapwater StudyNorth America | Free
- California Division of Drinking Water PFAS DataNorth America | Free
- Michigan PFAS Action Response Team (MPART) DataNorth America | Free
- Minnesota Department of Health PFAS DashboardNorth America | Free
- EPA UCMR 5 PFAS Drinking Water DataNorth America | Free
- EWG Arsenic, Nitrate & Chromium-6 Co-occurrence MapNorth America | Free
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