Good — Average Score 81/100
State Overview
Water quality across Tennessee receives an overall grade of B (Good) with an average score of 81 out of 100, based on EPA compliance data from 602 ZIP codes statewide. This places Tennessee 6 points above the national average of 75, indicating relatively strong water quality management across the state. A majority of ZIP codes (55%) earn an A grade, reflecting strong compliance across most water systems. The lowest-scoring area is ZIP code 37160 (Shelbyville) with a score of 23/100. 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