COUNTY WATER-SYSTEM LEDGER
Lake, Indiana
EPA’s September 2026 export lists 15 active community water systems serving Lake, Indiana, with 2 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving Lake, Indiana
EPA associates 15 covered systems with Lake, Indiana; their reported population-served values total 517,443 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Indiana American Water - NorthwestIN5245015 | 210,510 | Surface water | No current violation flagged |
| Hammond Water Works DepartmentIN5245020 | 78,384 | Surface water | No current violation flagged |
| Crown Point Water WorksIN5245008 | 30,000 | Surface water purchased | No current violation flagged |
| Schererville Water DepartmentIN5245041 | 30,000 | Surface water purchased | No current violation flagged |
| East Chicago Water WorksIN5245012 | 26,370 | Surface water | No current violation flagged |
| St. John Municipal Water UtilityIN5245043 | 25,700 | Ground water | No current violation flagged |
| Highland Water WorksIN5245021 | 23,984 | Surface water purchased | No current violation flagged |
| Munster Water CompanyIN5245031 | 23,894 | Surface water purchased | Other current violation flag |
| Griffith Water DepartmentIN5245019 | 16,893 | Surface water purchased | No current violation flagged |
| Dyer Water DepartmentIN5245011 | 16,800 | Surface water purchased | No current violation flagged |
| Indiana American Water - LowellIN5245029 | 11,908 | Groundwater under influence of surface water | No current violation flagged |
| Cuii - Twin LakesIN5245046 | 8,000 | Ground water | No current violation flagged |
| New Chicago Water WorksIN5245032 | 5,500 | Surface water purchased | No current violation flagged |
| Whiting Water DepartmentIN5245048 | 4,900 | Surface water purchased | No current violation flagged |
| Cedar Lake Water WorksIN5245047 | 4,600 | Ground water | Current monitoring/reporting flag |
02 / SOURCE MIX
Primary water sources for Lake, Indiana
EPA classifies 15 systems serving Lake, Indiana across 4 primary-source categories; Surface water is the largest category with 3 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.