County · Indiana
St. Joseph County, Indiana: drinking water records
This overview covers 20 ZIP codes and 14 community water systems in St. Joseph County. It also stands in for 1 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 |
|---|---|---|---|---|---|
| University of Notre Dame IN5271020 | 7,400 | 420 | 2 | 1 | 7.5 ppb |
| South Bend Water Works IN5271014 | 115,000 | 540 | 8 | 0 | 4.7 ppb |
| Mishawaka Utilities IN5271009 | 49,675 | 240 | 5 | 0 | 8.9 ppb |
| Walkerton Light & Water IN5271017 | 2,262 | 60 | 0 | 0 | 8.2 ppb |
| Sisters of Holy Cross-St. Marys College IN5271025 | 2,111 | 60 | 0 | 0 | 2.8 ppb |
| Hamilton Grove IN5271024 | 384 | 0 | 0 | 9 | 7.7 ppb |
| Sunset Village & RV Park IN5271016 | 25 | 0 | 0 | 2 | 0 ppb |
| North Liberty Water Works IN5271010 | 1,896 | 0 | 0 | 0 | 1.4 ppb |
| New Carlisle Water Works IN5271011 | 1,861 | 0 | 0 | 0 | 0 ppb |
| Lakeville Water Department IN5271008 | 750 | 0 | 0 | 0 | 0.8 ppb |
| Aqua Indiana - Wedgewood Park Water Util IN5271018 | 645 | 0 | 0 | 0 | 0 ppb |
| Sisters-St. Francis Perpetual Adoration IN5271026 | 145 | 0 | 0 | 0 | 5.9 ppb |
| Holston Rentals IN5271029 | 60 | 0 | 0 | 0 | 0 ppb |
| The Hills at St. Joe Farm IN5271002 | 25 | 0 | 0 | 0 | 0 ppb |
ZIP reports in St. Joseph County
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 46595.
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.