Illinois
Mercer County drinking water quality
27 active public water systems serve 11,007 people in Mercer County. 12 are compliant, 15 had at least one EPA violation in the past three years, 0 are designated serious violators, and 0 carry a health flag.
Community water systems
14 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Aledo Aledo |
3,470 | 0 | 0 | |
|
Viola Viola |
869 | 2 | 1 | |
|
Sherrard Sherrard |
785 | 1 | 0 | |
|
Fyre Lake Water Company |
760 | 3 | 0 | |
|
Keithsburg Keithsburg |
747 | 2 | 0 | |
|
New Windsor Windsor |
740 | 4 | 3 | |
|
Matherville Mathersville |
651 | 0 | 0 | |
|
New Boston New Boston |
613 | 1 | 1 | |
|
Joy Joy |
377 | 4 | 1 | |
|
Seaton Seaton |
214 | 4 | 0 | |
|
North Henderson North Henderson |
172 | 1 | 0 | |
|
Swedona Water Association |
109 | 1 | 0 | |
|
M C L W System, Inc. |
98 | 0 | 0 | |
|
Unity Water Corporation |
93 | 1 | 0 |
Non-community systems (13: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
7 Eleven |
504 | 0 | 0 | |
|
Trinity Presbyterian Church |
150 | 0 | 0 | |
|
Camp Summit |
100 | 1 | 0 | |
|
First Christian Church (131912) |
100 | 0 | 0 | |
|
Haven Hills Campground and Resort |
80 | 1 | 0 | |
|
Norwood United Presbyterian Church |
80 | 0 | 0 | |
|
Cable Community Church |
70 | 0 | 0 | |
|
Mercer Market Vending Machine |
60 | 0 | 0 | |
|
Boden Comm Water Assn |
50 | 1 | 0 | |
|
Gold Star FS |
40 | 0 | 0 | |
|
Lgc Shady Lakes RV LLC |
25 | 2 | 0 | |
|
Midwest Fiber Products INC |
25 | 0 | 0 | |
|
Twice the Ice Aledo |
25 | 0 | 0 |
Inactive systems (88, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
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.