County · Indiana
Lake County, Indiana: drinking water records
This overview covers 27 ZIP codes and 28 community water systems in Lake 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 |
|---|---|---|---|---|---|
| Hammond Water Works Department IN5245020 | 78,384 | 120 | 0 | 1 | 3 ppb |
| Indiana American Water - Lowell IN5245029 | 11,908 | 120 | 0 | 5 | 1 ppb |
| Cedar Lake Water Works IN5245047 | 4,600 | 120 | 0 | 1 | 1.1 ppb |
| Indiana American Water - Northwest IN5245015 | 210,510 | 240 | 0 | 0 | 3 ppb |
| Crown Point Water Works IN5245008 | 30,000 | 120 | 0 | 0 | 0.7 ppb |
| Schererville Water Department IN5245041 | 30,000 | 120 | 0 | 0 | 1 ppb |
| East Chicago Water Works IN5245012 | 26,370 | 120 | 0 | 0 | 8 ppb |
| St. John Municipal Water Utility IN5245043 | 25,700 | 120 | 0 | 0 | 2.7 ppb |
| Highland Water Works IN5245021 | 23,984 | 120 | 0 | 0 | 2.4 ppb |
| Munster Water Company IN5245031 | 23,894 | 120 | 0 | 0 | 2 ppb |
| Griffith Water Department IN5245019 | 16,893 | 120 | 0 | 0 | 1.0 ppb |
| Dyer Water Department IN5245011 | 16,800 | 120 | 0 | 0 | 7.7 ppb |
| Cuii - Twin Lakes IN5245046 | 8,000 | 120 | 0 | 0 | 2.3 ppb |
| New Chicago Water Works IN5245032 | 5,500 | 120 | 0 | 0 | 0 ppb |
| Whiting Water Department IN5245048 | 4,900 | 120 | 0 | 0 | 3.7 ppb |
| Apple Valley Utilities, INC. IN5245001 | 712 | 120 | 0 | 0 | 0 ppb |
| Fairway Regional Water District IN5245009 | 210 | 0 | 0 | 1 | 0 ppb |
| Aqua Indiana Water Company IN5245017 | 1,350 | 0 | 0 | 0 | 0 ppb |
| Cedar Lake - Robins Nest IN5245067 | 950 | 0 | 0 | 0 | 18 ppb |
| Schneider Water Department IN5245042 | 267 | 0 | 0 | 0 | 0.3 ppb |
| Lakeshore Subdivision Association, INC. IN5245053 | 265 | 0 | 0 | 0 | 2 ppb |
| Cedar Lake Mobile Home Park IN5245005 | 200 | 0 | 0 | 0 | 0.1 ppb |
| Cedar Lake Bible Conference Grounds IN5245055 | 150 | 0 | 0 | 0 | 4.6 ppb |
| Noble Oaks Subdivision Water Association IN5245054 | 70 | 0 | 0 | 0 | 1.3 ppb |
| Oakwood Mobile Home Park IN5245034 | 45 | 0 | 0 | 0 | 0.7 ppb |
ZIP reports in Lake 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: 46377.
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.