Moderate-low record-based concern — Population-weighted indicator 75/100
State Overview
Water quality across Minnesota receives an overall grade of B (Moderate-low record-based concern) with an average score of 75 out of 100, based on EPA compliance data from 231 ZIP codes statewide. This is roughly in line with the national average of 75. A majority of ZIP codes (68%) earn an A grade, reflecting strong compliance across most water systems. 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