waterbycounty

Indiana Water Quality

Drinking water data for all 92 counties.

Avg Water Score

52.5

State Grade

D

Counties with Data

92

of 92 total

All Indiana Counties

CountyWater Score
Blackford County86.0
Brown County86.0
Fayette County86.0
Floyd County86.0
Hancock County86.0
Henry County86.0
Jay County86.0
Jefferson County86.0
Johnson County86.0
Martin County86.0
Morgan County86.0
Orange County86.0
Owen County86.0
Scott County86.0
Switzerland County86.0
Union County86.0
Vanderburgh County86.0
Marion County71.3
St. Joseph County68.6
Lake County68.4
Harrison County67.1
Jackson County66.8
Greene County66.2
Howard County65.8
Vigo County65.0
Allen County64.8
Daviess County64.4
Bartholomew County64.2
Porter County63.8
Tippecanoe County63.8
Shelby County63.2
Sullivan County62.6
Hendricks County62.2
Delaware County61.2
Whitley County59.1
Putnam County58.3
Dearborn County57.5
Marshall County57.1
Grant County56.8
Elkhart County56.4
Noble County56.1
Dubois County55.8
Spencer County54.3
Perry County53.9
Hamilton County53.6
Clark County53.5
Fulton County53.2
Madison County53.0
Wayne County52.0
Randolph County51.5
Wells County51.4
Tipton County50.5
Knox County50.4
Starke County50.4
Clay County49.1
Cass County48.8
Newton County48.8
Warrick County47.8
Boone County47.7
DeKalb County47.5
Pike County46.2
LaPorte County43.1
Ripley County41.5
Montgomery County40.0
Monroe County39.8
Vermillion County38.0
Crawford County36.5
Adams County34.7
Clinton County34.6
Gibson County34.1
Pulaski County33.9
Jennings County32.8
Ohio County32.4
Jasper County31.8
White County31.4
LaGrange County31.2
Huntington County29.9
Carroll County26.4
Kosciusko County24.4
Miami County23.5
Lawrence County22.2
Wabash County20.7
Franklin County20.4
Rush County20.3
Benton County20.1
Steuben County18.3
Washington County15.1
Fountain County13.8
Warren County13.0
Decatur County11.8
Posey County11.7
Parke County7.4

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Frequently Asked Questions

Which county in Indiana has the best water quality?
Blackford County has the highest water quality score in Indiana at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in Indiana has the most water violations?
Parke County has among the lowest water quality scores in Indiana at 7.4/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in Indiana?
Indiana has an average water quality score of 52.5/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in Indiana water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.

Data Source

Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

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