States → Indiana
State profile · EPA SDWIS + UCMR5
Indiana Drinking Water Quality
3,967 public water systems serve 5,774,616 people across Indiana, with every Safe Drinking Water Act violation and UCMR5 PFAS result on record.
- 3,967
- Water systems
- 352,710
- Total violations
- 95.8%
- Systems w/ a violation
- 40.6%
- PFAS detection rate
The verdict
Across Indiana, 3,799 of 3,967 water systems (95.8%) carry at least one EPA violation, and 93 of 229 UCMR5-tested systems show PFAS.
- 352,710
- Total EPA violations on record
- 10%
- Health-based (MCL / treatment)
- 95.8%
- Systems with ≥1 violation
- 40.6%
- UCMR5 PFAS detection rate
Water Systems
3,967
Total Violations
352,710
Violation Rate
95.8%
PFAS Detection
40.6%
93 of 229 tested
Violation Composition
How Indiana's 352,710 violations break down by type, per EPA SDWIS classification.
Health-based (35,932) Monitoring/Reporting (316,778)
| Metric | Value | Share |
|---|---|---|
| Public water systems | 3,967 | - |
| Population served | 5,774,616 | - |
| Total violations | 352,710 | 100% |
| Health-based violations | 35,932 | 10.2% |
| Systems with violations | 3,799 | 95.8% |
| PFAS detection rate | 93 of 229 | 40.6% |
Health-based violations indicate the contaminant exceeded an EPA Maximum Contaminant Level (MCL) or treatment-technique requirement. Monitoring/reporting violations indicate procedural issues (missed tests, late reports) - not necessarily a contamination event.
Largest Water Systems
Citizens Water - Indianapolis
Indianapolis, IN · 880,345 served
Fort Wayne - 3 Rivers Filtration Plant
Fort Wayne, IN · 269,994 served
Indiana American Water - Northwest
Greenwood, IN · 210,510 served
Evansville Water Utility
Evansville, IN · 182,444 served
South Bend Water Works
South Bend, IN · 115,000 served
Indiana American Water - S. Indiana
Greenwood, IN · 104,445 served
Carmel Water Department
Carmel, IN · 99,927 served
Indiana American Water - Johnson County
Greenwood, IN · 86,813 served
City of Bloomington Utilities
Bloomington, IN · 83,000 served
Hammond Water Works Department
Hammond, IN · 78,384 served
Indiana American Water - Muncie
Greenwood, IN · 74,030 served
Lafayette Water Works
Lafayette, IN · 70,835 served
Indiana American Water - Terre Haute
Greenwood, IN · 67,765 served
Citizens Water of Westfield, LLC
Indianapolis, IN · 61,493 served
Indiana American Water - Kokomo
Greenwood, IN · 59,313 served
Anderson Water Department
Anderson, IN · 58,942 served
Columbus Municipal Utility
Columbus, IN · 51,122 served
Purdue Univ. Water Works
West Lafayette, IN · 50,000 served
Mishawaka Utilities
Mishawaka, IN · 49,675 served
City of Lawrence Utilities
Indianapolis, IN · 49,000 served
Most Violations
#1 Willow Springs MHP Greenfield
4,792 #2 Plymouth Community Church Plymouth
3,151 #3 Forest River - Rance Aluminum, Div. 46 Mishawaka
2,489 #4 A & a Sheet Metal Products Laporte
2,000 #5 Shady Grove Mobile Home Park Valparaiso
1,998 #6 Creekside Manor MHP Lapaz
1,992 #7 Country View Estates Crawfordsville
1,812 #8 River Bend Manor Mobile Home Park Roselawn
1,785 #9 Church of the Heartland Starke Co., Inc Winamac
1,661 #10 Springhill Mobile Home Court Laporte
1,619 #11 Renaissance Academy Laporte
1,552 #12 Russellville Water Works Russellville
1,340 #13 Good Shepherd UMC/Little Lamb Chldrn Min Indianapolis
1,286 #14 Dana Water Works Dana
1,191 #15 Gatewood Estates Plymouth
1,179 Counties in Indiana
Marion
56 systems · 949,929 served
· 5,652 violations
Lake
108 systems · 539,424 served
· 12,533 violations
Allen
91 systems · 324,113 served
· 5,221 violations
Hamilton
66 systems · 229,377 served
· 6,714 violations
St. Joseph
221 systems · 218,797 served
· 16,354 violations
Vanderburgh
6 systems · 195,582 served
· 332 violations
Clark
11 systems · 186,708 served
· 1,313 violations
Tippecanoe
88 systems · 175,836 served
· 7,057 violations
Johnson
33 systems · 154,825 served
· 2,956 violations
Elkhart
282 systems · 138,184 served
· 26,344 violations
Monroe
11 systems · 126,334 served
· 676 violations
Madison
49 systems · 103,123 served
· 2,880 violations
Delaware
66 systems · 97,615 served
· 4,362 violations
LaPorte
126 systems · 95,164 served
· 20,287 violations
Vigo
29 systems · 87,540 served
· 2,997 violations
Hendricks
53 systems · 85,793 served
· 3,666 violations
Bartholomew
15 systems · 76,992 served
· 1,592 violations
Howard
44 systems · 73,406 served
· 5,685 violations
Warrick
10 systems · 63,888 served
· 682 violations
Dubois
11 systems · 61,963 served
· 930 violations
Morgan
23 systems · 61,105 served
· 2,842 violations
Kosciusko
305 systems · 61,088 served
· 26,339 violations
Porter
83 systems · 60,757 served
· 6,413 violations
Wayne
59 systems · 58,098 served
· 4,578 violations
Grant
47 systems · 52,670 served
· 3,905 violations
Dearborn
10 systems · 46,909 served
· 431 violations
Lawrence
6 systems · 46,335 served
· 1,011 violations
Hancock
60 systems · 45,547 served
· 4,984 violations
Harrison
8 systems · 41,282 served
· 526 violations
Steuben
145 systems · 40,851 served
· 6,810 violations
Showing top 30 of 92 counties.
Drinking Water Guides
Frequently Asked Questions
How many water systems are in Indiana? ▼
Indiana has 3,967 public water systems serving approximately 5,774,616 people. These include community water systems, non-transient non-community systems, and transient non-community systems regulated under the Safe Drinking Water Act.
How many drinking water violations are in Indiana? ▼
Indiana has 352,710 total drinking water violations on record, with 35,932 classified as health-based violations. 95.8% of water systems in the state have at least one violation.
Has PFAS been found in Indiana drinking water? ▼
Of 229 water systems tested for PFAS in Indiana, 93 had PFAS detected, a 40.6% detection rate. PFAS are persistent "forever chemicals" that do not break down in the environment.
What is the violation rate for Indiana water systems? ▼
Indiana's violation rate is 95.8%. This measures the percentage of public water systems that have at least one recorded violation in the EPA SDWIS database, including both health-based and monitoring/reporting violations.
Where does this Indiana water data come from? ▼
All drinking water data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS is the federal database that tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources & Methodology
Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.