waterbycounty
Compiled federal source snapshot

Indiana Water Quality

Drinking water data for all 92 counties.

Avg SDWIS Compliance Index

51.3

Most Common Five-Year SDWIS Compliance Band

F

Counties with Data

92

of 92 total

County water atlas

Indiana water signals by county

A state-level 2.5D view across drinking-water compliance, watershed impairment, monitoring density, and streamflow snapshot context. Pin any county, switch layers, then use the lens controls to compare index ranges, recorded violation rates, or impaired watersheds without leaving the page.

Counties

92

Avg SDWIS index

51.3

Watersheds

92

ATTAINS counties

Monitoring

91

68 fresh USGS snapshots

State atlas layers combine EPA SDWIS health-based violations, EPA ATTAINS 303(d) impairment assessments, EPA Water Quality Portal monitoring sites, and representative USGS NWIS streamflow gauges. Streamflow values appear only for fresh pipeline snapshots, not as a continuously updated stream. County pages include the observation time and year.

Prepared by ByCounty Editorial TeamPublished by WaterByCounty

Multi-source coverage in Indiana

Beyond Drinking Water

EPA SDWIS

92/ 92

counties with drinking-water compliance data

393 health violations statewide (5yr)

EPA ATTAINS

69.5%

avg impaired across 92 counties

6,421 of 9,258 assessed bodies impaired

EPA WQP

3,152

monitoring sites across 91 counties

948,065 total readings (5yr window)

USGS NWIS

68

counties with a fresh pipeline snapshot

1 above65 below

State atlas notes

What stands out in Indiana

County water quality is not one number. The strongest read comes from comparing drinking-water compliance against watershed impairment, monitoring density, and streamflow context. Use these signals as a starting point, then open any county profile for source-level detail.

Compliance spread

Blackford County has the highest value in the published state SDWIS Compliance Index table at 86.2/100, while Parke County has the lowest at 5.6/100. That is a 80.6 point gap inside one state.

Zero health violations

17

3+ health violations

43

Watershed pressure

The atlas impairment layer points to counties where assessed water bodies are most likely to miss state quality standards. Assessment density varies, so compare the percentage with the number of assessed bodies on the county page.

Blackford County96.3%Carroll County95.0%Tipton County95.0%

Monitoring hubs

Tippecanoe County161 sitesLake County151 sitesMarion County148 sites

Lowest flow reads

Hendricks County1%Jefferson County4%Jay County5%

Highest fresh streamflow pipeline snapshots: Lake County (112%, observation 2026), Martin County (100%, observation 2026), St. Joseph County (92%, observation 2026). These are source-data observations, not household tap-water conclusions.

All Indiana Counties

CountySDWIS Compliance Index
Blackford County86.2
Brown County86.2
Fayette County86.2
Floyd County86.2
Fulton County86.2
Hancock County86.2
Henry County86.2
Jay County86.2
Jefferson County86.2
Johnson County86.2
Martin County86.2
Morgan County86.2
Orange County86.2
Scott County86.2
Switzerland County86.2
Union County86.2
Vanderburgh County86.2
Marion County71.2
Lake County69.8
Allen County69.0
St. Joseph County68.8
Howard County66.9
Hendricks County65.1
Vigo County65.1
Jackson County64.5
Tippecanoe County64.5
Bartholomew County64.1
Greene County63.6
Dubois County62.6
Delaware County61.9
Daviess County60.7
Putnam County60.7
Clark County60.5
Dearborn County59.8
Porter County59.8
Marshall County59.6
Cass County59.3
Hamilton County59.3
Shelby County59.1
Warrick County58.6
Harrison County58.3
Sullivan County57.6
Madison County57.3
Spencer County56.9
Perry County56.5
Elkhart County55.7
Ripley County54.7
Whitley County53.6
Owen County53.5
Wayne County52.3
Grant County50.7
Noble County50.0
Clinton County49.9
Pike County47.7
Wells County44.3
Starke County42.8
Knox County42.6
Carroll County42.2
Monroe County41.2
Clay County40.8
Boone County39.3
DeKalb County38.4
Gibson County37.3
Randolph County37.2
Adams County35.6
LaPorte County35.6
Pulaski County34.8
Washington County34.4
Lawrence County34.3
Ohio County33.1
Jennings County31.2
Jasper County30.2
Newton County28.0
Montgomery County27.8
White County25.3
Tipton County24.1
Huntington County21.5
Vermillion County20.2
LaGrange County20.0
Franklin County19.5
Miami County19.4
Decatur County19.3
Benton County19.1
Kosciusko County18.7
Crawford County18.0
Warren County16.4
Steuben County15.9
Posey County14.6
Wabash County14.3
Rush County13.6
Fountain County12.6
Parke County5.6

Frequently Asked Questions

Which Indiana county has the highest SDWIS Compliance Index?
Blackford County has the highest SDWIS Compliance Index in the published Indiana cohort at 86.2/100. This WaterByCounty relative comparison is not an EPA score and does not establish current conditions for a utility or address.
What does the Five-Year SDWIS Compliance Band mean?
The band is derived only from each county aggregation's recorded health-violation rate per 100,000 people served for the stated five-year source window. It is separate from the relative SDWIS Compliance Index and is not a current determination for a specific utility or address.
What does EPA ATTAINS report across Indiana?
Across 92 published Indiana county records with EPA ATTAINS data, 6,421 of 9,258 assessed water bodies are listed as impaired. This is a watershed assessment and does not describe finished household tap water.
Which USGS streamflow records are shown across Indiana?
WaterByCounty has 68 fresh USGS pipeline snapshots in the published Indiana cohort. Each county page shows its observation timestamp and year. A pipeline snapshot is not a continuously updated reading or a tap-water safety measure.
Where can Indiana residents find current official information?
Review the applicable utility's Consumer Confidence Report, active notices, and the state drinking-water agency. WaterByCounty's county-level historical aggregations do not establish the current status of a specific utility, address, private well, or household plumbing system.
What does Water Quality Portal monitoring volume show in Indiana?
The published county records contain 948,065 results from 3,152 monitoring locations in the site's five-year aggregation. Monitoring volume does not by itself indicate better or worse water quality.

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. The WaterByCounty SDWIS Compliance Index reflects the recorded rate and is not an EPA score.

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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