District of Columbia County Water Quality Reports
Water quality reports for all counties in District of Columbia. Browse by county to see safety scores, violations, and ZIP code data.
Browse water quality data by county in District of Columbia. Each county page lists all ZIP codes with safety scores and EPA violation data.
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District of Columbia County, DC Water: 68/100 (2026)
2026 report: District of Columbia County, DC scores 68/100 (Grade C). 284 ZIP codes analyzed. 8976 EPA violations found. Free report with contaminant da...
Dorchester County, DC: 6 Health Violations — 72/100 (2026)
2026 report: Dorchester County, DC scores 72/100 (Grade B). 1 ZIP code analyzed. 33 EPA violations found. Free report with contaminant data and filter p...
Plymouth County, DC: 6 Health Violations — 72/100 (2026)
2026 report: Plymouth County, DC scores 72/100 (Grade B). 1 ZIP code analyzed. 33 EPA violations found. Free report with contaminant data and filter picks.
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