Moderate-low record-based concern — Population-weighted indicator 72/100
State Overview
Water quality across District of Columbia receives an overall grade of B (Moderate-low record-based concern) with an average score of 72 out of 100, based on EPA compliance data from 268 ZIP codes statewide. This is roughly in line with the national average of 75. Scores are calculated from EPA Safe Drinking Water Information System (SDWIS) violation records, lead and copper testing results, PFAS monitoring data from UCMR5, and enforcement actions over the past 5 years.
Lowest Scoring ZIP Codes