Water Quality by State
Browse water quality reports for all 50 US states. Select a state to see city-by-city water quality scores and contaminant data.
Northeast
Southeast
Midwest
About Our State Water Quality Data
Data Sources
Our water quality data comes directly from the EPA's Safe Drinking Water Information System (SDWIS) and ECHO databases. These contain testing results and compliance records for every public water system.
Update Frequency
Water quality data is updated regularly as new testing results are reported to the EPA. Most water systems are required to test and report on a quarterly or annual basis.