Groundwater Rule (GWR) violations in Illinois
19 active public water systems in Illinois had a Groundwater Rule (GWR) violation in the past three years, 19 of them in the latest quarter of EPA's data. What Groundwater Rule (GWR) is and why it matters.
Systems with a Groundwater Rule (GWR) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Camp Duncan Pool Lake County |
960 | 4 | 2 | |
|
Camp Independence Lake County |
960 | 4 | 2 | |
|
Smiths Float Inn Park Lake County |
170 | 2 | 1 | |
|
Duncan House Lake County |
105 | 2 | 1 | |
|
Bobs Marina Lake County |
100 | 2 | 1 | |
|
Braidwood Rec Club Coyote Will County |
100 | 1 | 1 | |
|
Dickson Valley Camp Kendall County |
100 | 1 | 1 | |
|
Johnsons Mound Forest Preserve (31021) Kane County |
100 | 3 | 2 | |
|
Kankakee Elks Country Club Kankakee County |
100 | 2 | 2 | |
|
Marengo Ridge (16162) McHenry County |
50 | 3 | 1 | |
|
Pelican Bay Marina Lake County |
50 | 1 | 1 | |
|
Gfl Illinois LLC Kane County |
45 | 2 | 1 | |
|
Camp Duncan Fireside Lake County |
25 | 4 | 2 | |
|
Camp Duncan Sorenson Lodge Lake County |
25 | 4 | 2 | |
|
Catalpa Grove Stark County |
25 | 1 | 1 | |
|
Fish Lake Beach Lake County |
25 | 1 | 1 | |
|
Wilson Nurseries Camp NO 2 Kane County |
25 | 4 | 2 | |
|
Wilson Nurseries Camp NO 3 Kane County |
25 | 3 | 2 | |
|
Waterfall Glen Forest Preserve DuPage County |
25 | 2 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Groundwater Rule (GWR), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Groundwater Rule (GWR) 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.