Water quality in Seneca, Illinois
Seneca is in LaSalle County. 172 active public water systems serve the county; 101 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 LaSalle County
36 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Seneca Mobile Homes LLC |
10 | 2 | 1.1 mi | |
| Country Acres MHP (la Salle County) |
222 | 1 | 1.4 mi | |
| Four Star Campground Marseilles |
250 | 1 | 3.0 mi | |
| Marseilles Marseilles |
5,061 | 4 | 4.8 mi | |
| Naplate Naplate |
465 | 2 | 11.9 mi | |
| IL Prairie Estate Sbdv Water Association |
78 | 0 | 12.3 mi | |
| Ottawa Ottawa |
18,097 | 3 | 12.3 mi | |
| Grand Ridge Grand Ridge |
515 | 1 | 12.8 mi | |
| Oaklane Sbdv |
63 | 1 | 13.1 mi | |
| Land and Wtr Assn |
83 | 2 | 13.4 mi | |
| Ottawa Estates MHP |
125 | 0 | 13.8 mi | |
| Sheridan Correctional Center |
1,670 | 2 | 14.8 mi | |
| IL American-Streator Streator |
19,000 | 0 | 18.4 mi | |
| Jons MHP |
92 | 3 | 20.5 mi | |
| IL American-Leonore Leonore |
111 | 0 | 21.3 mi | |
| Countryside Estates MHP |
158 | 0 | 21.3 mi | |
| North Utica North Utica |
1,323 | 3 | 21.3 mi | |
| IL American-Lake Holiday |
4,750 | 0 | 21.5 mi | |
| Leland Leland |
951 | 0 | 23.4 mi | |
| Oglesby Oglesby |
4,500 | 1 | 23.7 mi | |
| Jonesville Pwd |
243 | 1 | 24.0 mi | |
| Ilog Oglesby Mhp, LLC Oglesby |
88 | 0 | 24.4 mi | |
| Tonica Tonica |
705 | 0 | 24.8 mi | |
| Earlville Earlville |
1,613 | 0 | 25.1 mi | |
| LA Salle La Salle |
9,700 | 4 | 25.4 mi |
Non-community systems in LaSalle County (135: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to LaSalle County, nearest to Seneca 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.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 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 Illinois 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.