Indiana water quality by county
92 counties with public water systems. Pick a county to see every system that serves it.
| County | Active systems | People served | Share with violations, 3 yr | Serious violators | Health flags |
|---|---|---|---|---|---|
| Adams County | 74 | 22,936 | 1 | 0 | |
| Allen County | 86 | 323,472 | 3 | 4 | |
| Bartholomew County | 16 | 76,972 | 0 | 1 | |
| Benton County | 8 | 7,527 | 0 | 0 | |
| Blackford County | 7 | 7,573 | 0 | 0 | |
| Boone County | 30 | 40,583 | 0 | 0 | |
| Brown County | 5 | 24,969 | 0 | 0 | |
| Carroll County | 38 | 11,859 | 0 | 2 | |
| Cass County | 41 | 25,508 | 0 | 0 | |
| Clark County | 11 | 186,451 | 0 | 1 | |
| Clay County | 15 | 17,977 | 0 | 0 | |
| Clinton County | 32 | 24,769 | 0 | 0 | |
| Crawford County | 6 | 7,085 | 1 | 1 | |
| Daviess County | 8 | 25,462 | 1 | 0 | |
| DeKalb County | 50 | 31,731 | 0 | 1 | |
| Dearborn County | 10 | 46,909 | 0 | 0 | |
| Decatur County | 17 | 22,794 | 1 | 1 | |
| Delaware County | 61 | 97,164 | 0 | 2 | |
| Dubois County | 11 | 61,963 | 0 | 0 | |
| Elkhart County | 284 | 138,805 | 3 | 7 | |
| Fayette County | 9 | 16,181 | 0 | 0 | |
| Floyd County | 4 | 25,657 | 0 | 0 | |
| Fountain County | 17 | 11,332 | 1 | 2 | |
| Franklin County | 10 | 13,414 | 0 | 0 | |
| Fulton County | 34 | 11,000 | 0 | 1 | |
| Gibson County | 12 | 28,809 | 0 | 0 | |
| Grant County | 48 | 52,771 | 2 | 0 | |
| Greene County | 8 | 36,212 | 0 | 0 | |
| Hamilton County | 66 | 229,378 | 0 | 1 | |
| Hancock County | 60 | 45,812 | 1 | 3 | |
| Harrison County | 8 | 41,282 | 1 | 1 | |
| Hendricks County | 53 | 93,427 | 0 | 0 | |
| Henry County | 57 | 39,068 | 0 | 1 | |
| Howard County | 57 | 74,922 | 0 | 0 | |
| Huntington County | 33 | 27,859 | 1 | 3 | |
| Jackson County | 8 | 39,866 | 0 | 0 | |
| Jasper County | 65 | 21,751 | 1 | 2 | |
| Jay County | 30 | 13,183 | 0 | 0 | |
| Jefferson County | 11 | 34,443 | 0 | 0 | |
| Jennings County | 10 | 25,878 | 0 | 0 | |
| Johnson County | 33 | 154,825 | 2 | 0 | |
| Knox County | 18 | 32,275 | 0 | 0 | |
| Kosciusko County | 293 | 60,371 | 11 | 15 | |
| LaGrange County | 210 | 25,913 | 6 | 11 | |
| LaPorte County | 126 | 95,092 | 2 | 7 | |
| Lake County | 111 | 535,388 | 3 | 5 | |
| Lawrence County | 6 | 46,335 | 0 | 0 | |
| Madison County | 47 | 98,909 | 1 | 0 | |
| Marion County | 56 | 948,624 | 1 | 0 | |
| Marshall County | 87 | 38,447 | 1 | 4 | |
| Martin County | 5 | 14,412 | 0 | 0 | |
| Miami County | 68 | 26,424 | 0 | 3 | |
| Monroe County | 11 | 126,334 | 1 | 1 | |
| Montgomery County | 45 | 29,341 | 1 | 5 | |
| Morgan County | 23 | 60,967 | 0 | 0 | |
| Newton County | 39 | 12,905 | 1 | 2 | |
| Noble County | 101 | 31,676 | 4 | 2 | |
| Ohio County | 3 | 7,293 | 0 | 0 | |
| Orange County | 6 | 9,298 | 0 | 0 | |
| Owen County | 19 | 16,104 | 0 | 3 | |
| Parke County | 33 | 14,808 | 3 | 3 | |
| Perry County | 6 | 17,527 | 0 | 0 | |
| Pike County | 6 | 18,263 | 0 | 0 | |
| Porter County | 80 | 60,597 | 1 | 2 | |
| Posey County | 9 | 10,547 | 0 | 0 | |
| Pulaski County | 32 | 6,877 | 1 | 1 | |
| Putnam County | 25 | 27,886 | 0 | 1 | |
| Randolph County | 39 | 17,369 | 1 | 0 | |
| Ripley County | 10 | 31,173 | 0 | 1 | |
| Rush County | 26 | 11,097 | 1 | 0 | |
| Scott County | 2 | 25,087 | 0 | 0 | |
| Shelby County | 37 | 24,785 | 1 | 0 | |
| Spencer County | 15 | 19,310 | 0 | 0 | |
| St. Joseph County | 220 | 219,938 | 4 | 6 | |
| Starke County | 47 | 13,170 | 1 | 1 | |
| Steuben County | 144 | 41,484 | 1 | 3 | |
| Sullivan County | 13 | 19,464 | 0 | 0 | |
| Switzerland County | 7 | 14,108 | 0 | 1 | |
| Tippecanoe County | 89 | 175,886 | 3 | 8 | |
| Tipton County | 17 | 8,876 | 1 | 2 | |
| Union County | 14 | 3,557 | 0 | 0 | |
| Vanderburgh County | 6 | 195,582 | 0 | 0 | |
| Vermillion County | 17 | 17,540 | 1 | 2 | |
| Vigo County | 30 | 87,609 | 1 | 1 | |
| Wabash County | 51 | 29,389 | 2 | 1 | |
| Warren County | 23 | 5,176 | 0 | 1 | |
| Warrick County | 10 | 63,888 | 0 | 0 | |
| Washington County | 7 | 23,603 | 0 | 0 | |
| Wayne County | 59 | 58,098 | 1 | 1 | |
| Wells County | 24 | 21,070 | 1 | 1 | |
| White County | 80 | 21,604 | 6 | 15 | |
| Whitley County | 40 | 19,665 | 1 | 1 |
under 30% 30 to 59% 60% and over
About this data
Share with violations counts any violation in the past three years, including monitoring and reporting lapses. Counts cover active systems; systems serving more than one county are counted in each.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Indiana records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.