County · Indiana
Hamilton County, Indiana: drinking water records
This overview covers 13 ZIP codes and 14 community water systems in Hamilton County. It also stands in for 0 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Carmel Water Department IN5229004 | 99,927 | 300 | 0 | 2 | 2.9 ppb |
| Citizens Water of Westfield, LLC IN5229009 | 61,493 | 180 | 0 | 0 | 3.1 ppb |
| Indiana American Water - Noblesville IN5229015 | 45,575 | 180 | 1 | 0 | 5 ppb |
| Cicero Water Department IN5229005 | 5,607 | 60 | 0 | 0 | 7.0 ppb |
| Indiana Academy IN5229025 | 113 | 0 | 0 | 6 | 2.2 ppb |
| Little Eagle Creek Estates IN5229017 | 35 | 0 | 0 | 1 | 0 ppb |
| Harris Hills Mobile Home Park IN5229011 | 27 | 0 | 0 | 2 | 0 ppb |
| Indiana American Water - Sheridan IN5229014 | 4,435 | 0 | 0 | 0 | 2 ppb |
| Arcadia Water Department IN5229001 | 1,515 | 0 | 0 | 0 | 1.1 ppb |
| Atlanta Water Department IN5229002 | 735 | 0 | 0 | 0 | 20 ppb |
| Carmel Clay Water IN5229024 | 393 | 0 | 0 | 0 | 0 ppb |
| Suburban Estates, LLC IN5229020 | 350 | 0 | 0 | 0 | 0 ppb |
| Hamilton County Regional Utility IN5229027 | 125 | 0 | 0 | 0 | 0 ppb |
| Eagletown Estates Mobile Home Park IN5229023 | 97 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Hamilton County
No ZIP report in this county is published yet.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.