Stable
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Health/Geographic · Index Free
Drinking-Water Contamination Index
What is the drinking-water contamination risk and national ranking for this county or city?
- Refresh
- annual (EPA SDWA ECHO vintage)
- History
- single vintage
- Plan
- Free
Forward outlook
Prediction
- Horizon
- —
- Recommended use
- What is the drinking-water contamination risk and national ranking for this county or city?
Methodology
How it's built
Population-weighted health-based violation rate per public water system (EPA SDWIS/ECHO trailing 5-year window), ECDF percentile-ranked nationally by county and by city.
echo.epa.gov (EPA SDWA ECHO — health-based violations)
Version 1.0 · validated to beat a naive baseline · benchmark: —