Water quality for ZIP code 46321
ZIP 46321 covers Munster and Hammond in Lake County, Indiana, one of 27 ZIP codes in the county. 111 active public water systems serve the county; 73 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Lake County
29 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Highland Water Works Highland (highlands) |
23,984 | 0 | 2.4 mi | |
| Dyer Water Department Dyer |
16,800 | 0 | 3.4 mi | |
| Griffith Water Department Griffith |
16,893 | 2 | 4.1 mi | |
| Bremerton Mobile Home Park Griffith |
79 | 1 | 4.4 mi | |
| Hammond Water Works Department Hammond |
78,384 | 1 | 4.4 mi | |
| Schererville Water Department Schererville |
30,000 | 1 | 5.8 mi | |
| Crossings Mobile Home Park Merrillville |
100 | 2 | 6.8 mi | |
| St. John Municipal Water Utility St. John |
25,700 | 0 | 7.1 mi | |
| Aqua Indiana Water Company |
1,350 | 1 | 7.5 mi | |
| East Chicago Water Works East Chicago |
26,370 | 3 | 7.7 mi | |
| Whiting Water Department Whiting |
4,900 | 1 | 8.9 mi | |
| Cedar Gardens MHP Cedar Lake |
34 | 1 | 11.1 mi | |
| Rockwell Shores Apartments Merrillville |
45 | 1 | 11.7 mi | |
| Crown Point Water Works Crown Point |
30,000 | 1 | 11.9 mi | |
| New Chicago Water Works Hobart |
5,500 | 0 | 12.1 mi | |
| Cedar Lake Mobile Home Park Cedar Lake |
200 | 0 | 12.3 mi | |
| Cedar Lake Water Works Cedar Lake |
4,600 | 8 | 12.5 mi | |
| Cedar Lake Bible Conference Grounds Cedar Lake |
150 | 0 | 12.5 mi | |
| Sunset Harbor Condominiums Cedar Lake |
40 | 1 | 12.6 mi | |
| Lakeshore Subdivision Association, Inc. Cedar Lake |
265 | 2 | 12.9 mi | |
| Cedar Lake Robins Nest Schererville |
950 | 6 | 13.0 mi | |
| Indiana American Water Northwest Gary, Merrillville |
210,510 | 0 | 13.1 mi | |
| Noble Oaks Subdivision Water Association Cedar Lake |
70 | 0 | 15.2 mi | |
| Fairway Regional Water District Cedar Lake |
210 | 3 | 15.9 mi | |
| Cuii Twin Lakes Crown Point |
8,000 | 1 | 16.8 mi |
Non-community systems in Lake County (81: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Lake County, the county this ZIP code lies in, nearest to the ZIP code's centre first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Indiana records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.