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See contamination risks and historical water quality issues for major US cities. Each city profile includes primary contaminants of concern, past crises, current water quality grades, and links to detailed reports.
These cities have experienced significant contamination events or have ongoing water quality concerns. Click any city for detailed water quality information.
Major lead crisis 2014-2019 affected thousands of residents, particularly children. Corrosive water leached lead from pipes.
Lead contamination crisis 2018-2021. Over 23,000 lead service lines replaced.
Estimated 400,000 lead service lines remain. Ongoing replacement program.
Lead service lines common in older homes. Ongoing infrastructure upgrades.
Elevated lead levels found in schools and homes. Corrosion control improvements made.
Lead service lines in many neighborhoods. Testing recommended for older homes.
1993 Cryptosporidium outbreak affected 400,000+ people. Water treatment significantly upgraded.
Natural arsenic from desert geology. Chromium-6 detected at concerning levels.
High natural arsenic levels. Multiple aquifer cleanups from industrial contamination.
Relies on Colorado River and groundwater with naturally occurring contaminants.
Natural arsenic in groundwater. Industrial contamination from military and tech facilities.
Arsenic from natural sources. Nitrate contamination from agricultural areas.
Major PFAS contamination from plastics manufacturing. Filtration systems installed.
PFAS from Stewart Air National Guard Base firefighting foam. Treatment systems added.
Widespread PFAS contamination from paper mill. City connected to Kalamazoo water.
GenX contamination from Chemours facility. Ongoing monitoring and filtration.
PFAS from military bases and firefighting foam. Treatment systems installed.
PFAS from Pease Air Force Base. Contamination affected tens of thousands.
Agricultural runoff causes frequent nitrate spikes. Extensive treatment required.
Agricultural contamination widespread. Many small systems exceed EPA limits.
We track water quality data for thousands of cities across the US. Search for your city to view its complete water quality report, contaminant levels, and historical data.
Brain damage in children, common in older cities
Cancer risk, near military bases and industrial areas
Carcinogen, common in Southwest groundwater
Blue baby syndrome, agricultural regions
Immediate illness, aging infrastructure
Erin Brockovich chemical, industrial areas
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