District of Columbia Water Quality
Drinking water data for all 1 counties.
Avg Water Score
69.3
State Grade
C
Counties with Data
1
of 1 total
All District of Columbia Counties
| County | Water Score |
|---|---|
| District of Columbia | 69.3 |
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Frequently Asked Questions
Which county in District of Columbia has the best water quality?
District of Columbia has the highest water quality score in District of Columbia at 69.3/100 (Grade: B), based on EPA SDWIS data.
Which county in District of Columbia has the most water violations?
District of Columbia has among the lowest water quality scores in District of Columbia at 69.3/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in District of Columbia?
District of Columbia has an average water quality score of 69.3/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in District of Columbia water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.
Data Source
Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.
Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.