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Not health advice. Contact your local water utility for concerns.
Data from EPA Water Quality Reports. For official information, contact your water utility or health department.
Compare water quality across 23 counties in Indiana
23 counties ranked by average water quality score
| Rank | County | Avg Score | Grade | Cities | Population | Score Range |
|---|---|---|---|---|---|---|
| 1 | Johnson County | 97 | A+ | 2 | 90,041 | 96 - 97 |
| 2 | Delaware County | 91 | A | 1 | 65,194 | 91 - 91 |
| 3 | Wayne County | 90 | A | 1 | 35,467 | 90 - 90 |
| 4 | Hamilton County | 88 | A- | 4 | 314,748 | 83 - 93 |
| 5 | Jackson County | 87 | A- | 1 | 21,673 | 87 - 87 |
| 6 | Tippecanoe County | 86 | A- | 2 | 122,224 | 83 - 88 |
| 7 | Madison County | 86 | A- | 1 | 54,788 | 86 - 86 |
| 8 | Elkhart County | 85 | A- | 2 | 88,440 | 81 - 89 |
| 9 | Allen County | 85 | A- | 1 | 270,402 | 85 - 85 |
| 10 | Floyd County | 85 | A- | 1 | 37,603 | 85 - 85 |
| 11 | Vigo County | 85 | A- | 1 | 60,690 | 85 - 85 |
| 12 | Monroe County | 84 | B+ | 1 | 79,168 | 84 - 84 |
| 13 | Marion County | 82 | B+ | 2 | 937,012 | 80 - 84 |
| 14 | Howard County | 82 | B+ | 1 | 59,241 | 82 - 82 |
| 15 | Hendricks County | 82 | B+ | 1 | 35,203 | 82 - 82 |
| 16 | Porter County | 81 | B+ | 2 | 72,438 | 76 - 85 |
| 17 | Lake County | 80 | B+ | 7 | 298,151 | 57 - 94 |
| 18 | Clark County | 78 | B | 2 | 71,780 | 74 - 82 |
| 19 | Bartholomew County | 73 | B- | 1 | 50,474 | 73 - 73 |
| 20 | Grant County | 73 | B- | 1 | 27,730 | 73 - 73 |
| 21 | St. Joseph County | 68 | C+ | 3 | 185,506 | 46 - 86 |
| 22 | LaPorte County | 66 | C+ | 1 | 31,032 | 66 - 66 |
| 23 | Vanderburgh County | 64 | C | 1 | 117,298 | 64 - 64 |
2 cities • 90,041 residents
1 cities • 65,194 residents
1 cities • 35,467 residents
4 cities • 314,748 residents
1 cities • 21,673 residents
2 cities • 122,224 residents
1 cities • 54,788 residents
2 cities • 88,440 residents
1 cities • 270,402 residents
1 cities • 37,603 residents
1 cities • 60,690 residents
1 cities • 79,168 residents
See all 23 counties in the ranking table above
Our county-level water quality analysis aggregates data from municipal water systems across Indiana. Each county's score represents the average water quality across all analyzed cities within that county, weighted by population served.
With 23 counties and 40 cities analyzed, this data helps residents understand regional water quality patterns in Indiana. County scores range from 46/100 to 97/100, reflecting the diversity of water sources and treatment infrastructure across the state.
Currently, 3 counties in Indiana have average scores below 70, indicating potential water quality concerns. Residents in these areas should review their city's specific report and consider water filtration options.