Moderate-low record-based concern — Population-weighted indicator 76/100
State Overview
Water quality across Maine receives an overall grade of B (Moderate-low record-based concern) with an average score of 76 out of 100, based on EPA compliance data from 93 ZIP codes statewide. This is roughly in line with the national average of 75. Approximately 1% of ZIP codes (1 areas) receive a D or F grade, indicating communities with notable water quality concerns that warrant attention. 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