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Indiana Water Quality
513
Utilities in database
5.2M
Residents served
30%
On private wells
3
Key contaminants tracked
Drinking Water in Indiana
Indiana has 513 community water systems serving approximately 5.2 million residents. Primary water sources include groundwater. The most commonly reported contaminants include disinfection byproducts, lead, nitrates. 30% of Indiana residents rely on private wells. IDEM holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Indiana
Top 20 of 513 by populationCitizens Water - Indianapolis
IN5249004 · 880,345 served
Fort Wayne - 3 Rivers Filtration Plant
IN5202020 · 269,994 served
Indiana American Water - Northwest
IN5245015 · 210,510 served
Evansville Water Utility
IN5282002 · 182,444 served
South Bend Water Works
IN5271014 · 115,000 served
Indiana American Water - S. Indiana
IN5210005 · 104,445 served
Carmel Water Department
IN5229004 · 99,927 served
Indiana American Water - Johnson County
IN5241005 · 86,813 served
City of Bloomington Utilities
IN5253002 · 83,000 served
Hammond Water Works Department
IN5245020 · 78,384 served
Indiana American Water - Muncie
IN5218012 · 74,030 served
Lafayette Water Works
IN5279013 · 70,835 served
Indiana American Water - Terre Haute
IN5284012 · 67,765 served
Citizens Water of Westfield, Llc
IN5229009 · 61,493 served
Indiana American Water - Kokomo
IN5234007 · 59,313 served
Anderson Water Department
IN5248002 · 55,212 served
Columbus Municipal Utility
IN5203002 · 51,122 served
Purdue Univ. Water Works
IN5279015 · 50,000 served
Mishawaka Utilities
IN5271009 · 49,675 served
City of Lawrence Utilities
IN5249005 · 49,000 served
Key Contaminant Concerns in Indiana
Lead
Lead is a naturally occurring heavy metal that was widely used in plumbing infrastructure until it was banned for new installations in 1986. An estimated 9.2 million lead service lines still connect homes to public water mains across the United States, along with millions of homes with lead solder in their internal plumbing.
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always from human activity — nitrate interferes with the blood's ability to carry oxygen. The United States produces over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Indiana Water FAQs
Quick Links
Data source: Utility data from EPA SDWIS. 513 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-19