Water in Indiana.
Indiana's industrial corridor (East Chicago, Gary, Hammond) has some of the most documented lead-in-water exposure in the country. Agricultural nitrate and disinfection byproducts dominate elsewhere.
East Chicago's West Calumet housing complex was condemned in 2016 due to soil and water lead contamination.
How Indiana regulates drinking water.
Federal SDWA primacy. No state MCLs stricter than federal. PFAS sampling expanding under 2024 federal rule.
Indiana Department of Environmental Management — Drinking Water Branch
Indiana's water history, in order.
The contamination events, regulatory shifts, and major settlements that define how this state thinks about drinking water today.
- 2016
East Chicago's West Calumet housing complex condemned over lead contamination.
- 2019
Statewide lead testing of schools identifies hundreds of fixture-level exceedances.
The actual water you drink.
The physical rivers, aquifers, lakes, and reservoirs that feed Indiana's public water systems. Source quality is the foundation of tap quality — and where the long-term protection fights happen.
- riverWhite River
Indianapolis area.
- riverOhio River
Evansville, southern IN.
- riverSt. Joseph River
South Bend / Northern IN.
- aquiferTeays Valley Aquifer System
Buried bedrock-valley aquifer across central IN.
Source-water mix
~50% surface water, ~50% groundwater
Major cities served
Indianapolis · Fort Wayne · Evansville · South Bend · Carmel
Who actually serves the water.
The largest public water systems in Indiana by population served. Click your ZIP after to see the full live EWG report for your specific utility.
- Citizens Energy GroupIndianapolis800Kserved
- Indiana American Water — Fort WayneFort Wayne270Kserved
- Evansville Water and Sewer UtilityEvansville120Kserved
Where the contamination comes from.
Every state has a different industrial fingerprint. The industries below are the dominant historical and active contamination sources in Indiana's drinking water systems.
Lake County's industrial corridor (East Chicago, Gary, Hammond) is among the most contaminated industrial-residential overlap zones in the U.S. — heavy metals, PCBs, and lead exposure. Steel manufacturing legacy in northwest IN drives chromium and PFAS contamination.
What state data flags most consistently.
Drawn from EPA SDWIS sampling records, EWG state summaries, and regional regulatory action over the past five years. Read the full deep dive on each.
Lead
A neurotoxic metal that leaches from old pipes and solder. No safe level for children.
Trihalomethanes (TTHMs)
Byproducts of chlorinating water. Linked to bladder cancer at chronic exposure.
PFAS (Forever Chemicals)
A class of ~15,000 synthetic chemicals that don't break down. Now regulated for the first time.
Chromium-6 (Hexavalent Chromium)
The Erin Brockovich chemical. A known carcinogen with no federal-specific limit yet.
Risk isn't evenly distributed.
Residents of pre-1986 Lake County industrial communities (East Chicago, Gary, Hammond) face among the worst combined lead and industrial-contamination exposure in the country.
~15% on private wells. Northern Indiana karst region has documented bacterial and nitrate risk.
What's coming for Indiana's water.
Ohio River algal bloom risk increases with summer warming. Tile-drained agricultural runoff intensifies in extreme rainfall events. Central Indiana aquifer recharge declines under shifting precipitation patterns.
Voluntary statewide
IDEM provides voluntary technical assistance. Indianapolis Public Schools conducted voluntary testing 2018-2020.
Five questions for your next Consumer Confidence Report.
Your utility is required to send you a Consumer Confidence Report annually. Most are dense and procedural. These are the questions worth following up on for Indiana specifically.
- 1
If I'm in Lake County, has my utility been part of the East Chicago / West Calumet remediation oversight?
- 2
What is my Indianapolis-area utility's TTHM running annual average?
- 3
Has my school district published lead testing results?
Most state regulators allow public records requests for the underlying lab reports behind your CCR — your utility should be able to provide them on request.
For lead: NSF/ANSI 53 carbon block. For PFAS in northern Indiana: NSF/ANSI P473.
We don't recommend brands — the NSF/ANSI certification number matters more than the name on the box.
This is the state. Your address is the answer.
State-level patterns don't tell you about your specific tap. Run your ZIP for the live EWG contaminant report on your utility — or build a personalized Water File for your household.
Source-water mix, utility counts, lead-service-line estimates, and private-well shares are approximate, drawn from EPA SDWIS public data and state primacy-agency summaries. Contaminant rankings reflect EWG state-level monitoring data and regional regulatory action — they are not exhaustive. Timeline events are publicly documented. See methodology for the full sourcing. Search EPA SDWIS for Indiana