Good — Average Score 81/100
State Overview
Water quality across Ohio receives an overall grade of B (Good) with an average score of 81 out of 100, based on EPA compliance data from 1055 ZIP codes statewide. This places Ohio 6 points above the national average of 75, indicating relatively strong water quality management across the state. Approximately 4% of ZIP codes (38 areas) receive a D or F grade, indicating communities with notable water quality concerns that warrant attention. The lowest-scoring area is ZIP code 44319 (Akron) with a score of 33/100. 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