District of Columbia Water Quality
According to EPA Safe Drinking Water Information System (SDWIS), District of Columbia has 11 active community water systems in this extract. PlainEnviro's health-based slice lists 38 violation records across 7 systems with at least one such row. These are historical EPA registry counts, not a statewide drinkability score.
Health-based violation records for 11 community water systems in District of Columbia. Source: EPA Safe Drinking Water Information System (SDWIS).
Water Systems with Most Health-Based Records
| # | Water System | Health-Based Records | Health |
|---|---|---|---|
| 1 | JOINT BASE ANACOSTIA - BOLLING Washington | 12 | Yes |
| 2 | NAVAL STATION WASHINGTON - WNY Washington Navy Yard | 8 | Yes |
| 3 | Dibe Yazhi Habitiin (Borrego Pass) Day School-BIE Washington | 7 | Yes |
| 4 | D.C. WATER AND SEWER AUTHORITY Washington | 5 | Yes |
| 5 | BIE CHEMAWA INDIAN SCHOOL Washington | 4 | Yes |
| 6 | Eastern Navajo Agency - BIE Washington | 1 | Yes |
| 7 | Fort Wingate Community Washington | 1 | Yes |
Most Common Contaminants in District of Columbia
| Contaminant | Violations | Systems Affected |
|---|---|---|
| Surface Water Treatment Rule | 10 | 1 |
| Lead and Copper Rule | 9 | 2 |
| Coliform (TCR) | 6 | 1 |
| TTHM | 4 | 1 |
| Long Term 2 Enhanced Surface Water Treatment Rule | 4 | 2 |
| Revised Total Coliform Rule | 3 | 2 |
| LEAD AND COPPER RULE REVISIONS | 2 | 2 |
Cities with Water Quality Issues
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About This Data
Water quality data is from the EPA Safe Drinking Water Information System (SDWIS). Health-based violations include Maximum Contaminant Level (MCL) and Treatment Technique (TT) violations. Only community water systems (CWS) in District of Columbia are included.
Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services
Read our methodology - how this data is sourced, computed, and verified.