Diquat violations in Illinois
52 active public water systems in Illinois had a Diquat violation in the past three years, 15 of them in the latest quarter of EPA's data. What Diquat is and why it matters.
Systems with a Diquat violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Northbrook Northbrook · Cook County |
34,200 | 2 | 0 | |
|
North Chicago North Chicago · Lake County |
16,813 | 4 | 1 | |
|
Carlyle Carlyle · Clinton County |
3,373 | 4 | 1 | |
|
Prospect Heights Plaza Cook County |
1,240 | 6 | 2 | |
|
Vienna Correctional Center Johnson County |
501 | 3 | 0 | |
|
Victory Christian Center McLean County |
325 | 8 | 1 | |
|
Maranatha Bible Church Cook County |
213 | 3 | 0 | |
|
Mindhaven Academy McHenry County |
100 | 7 | 1 | |
|
Criswell Court MHP Joliet · Will County |
94 | 8 | 3 | |
|
Career Center of Southern Illinois Monroe County |
50 | 9 | 2 | |
|
Gpwd Center Will County |
50 | 4 | 0 | |
|
Walnut Grove MHC Champaign County |
40 | 5 | 0 | |
|
Nussbaum Transportation Well #3 McLean County |
30 | 2 | 0 | |
|
Zutat Feed Solutions Livingston County |
30 | 4 | 0 | |
|
Winnebago Landfill Winnebago County |
25 | 3 | 0 | |
|
Schaumburg Schaumburg · Cook County |
75,750 | 1 | 0 | |
|
Lockport Lockport · Will County |
23,100 | 4 | 0 | |
|
Crest Hill Crest Hill · Will County |
20,223 | 10 | 2 | |
|
Manhattan Manhattan · Will County |
10,340 | 1 | 0 | |
|
IL American-Whispering Hills McHenry County |
8,300 | 4 | 0 | |
|
Fountain Water District Valmeyer · Monroe County |
4,350 | 3 | 0 | |
|
South Jacksonville South Jacksonville · Morgan County |
3,501 | 4 | 0 | |
|
Dawson Dawson · Sangamon County |
2,375 | 5 | 1 | |
|
Northwest Bible Baptist Church Kane County |
1,600 | 4 | 0 | |
|
Clifton Clifton · Iroquois County |
1,500 | 1 | 0 | |
|
ST Anne Saint Anne · Kankakee County |
1,200 | 4 | 0 | |
|
Snap on Tools McHenry County |
700 | 7 | 0 | |
|
ST Francisville Saint Francisville · Lawrence County |
583 | 7 | 0 | |
|
Spring Grove Elementary School McHenry County |
500 | 6 | 0 | |
|
Bay View Baptist Church Tazewell County |
425 | 2 | 0 | |
|
Monroe Center School New Well Ogle County |
380 | 3 | 0 | |
|
Whole Foods Mart Kildeer Well Lake County |
250 | 3 | 1 | |
|
North Boone Middle School Boone County |
230 | 8 | 2 | |
|
Bone Gap Bone Gap · Edwards County |
209 | 5 | 1 | |
|
Kishwaukee College DeKalb County |
200 | 5 | 0 | |
|
Rockland Office Plaza Lake County |
200 | 7 | 1 | |
|
ST George School Kankakee County |
200 | 3 | 0 | |
|
Country Estates Subdivision Henry County |
188 | 5 | 2 | |
|
South Barrington Partners, LLC Cook County |
121 | 5 | 0 | |
|
Loves Travel Stop Ogle County |
80 | 6 | 2 | |
|
Trinity Lutheran School Randolph County |
80 | 9 | 1 | |
|
Ads Valley View Landfill, INC Macon County |
60 | 3 | 0 | |
|
American Precision Elctronics DuPage County |
60 | 4 | 1 | |
|
Spectrum Preferred Meats Ogle County |
60 | 7 | 1 | |
|
Cci Manufacturing Cook County |
57 | 5 | 0 | |
|
Dolan Education Center Winnebago County |
50 | 6 | 1 | |
|
Tegrant Sonoco Protective Solutions Will County |
50 | 6 | 0 | |
|
Kaluzny Bros INC Will County |
40 | 5 | 2 | |
|
Illinois Marine Towing Will County |
39 | 5 | 2 | |
|
Diversified Cpc Will County |
25 | 6 | 0 |
About this data
A system is counted once if any of its violations in the past three years involved Diquat, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Diquat alone.
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.