State
Illinois: drinking water records
EPA lists 1,783 community water systems serving homes in Illinois. 479 took part in EPA's national PFAS survey (UCMR 5), and 127 found at least one PFAS above the level laboratories can measure.
In focus1,783community water systems
Public records. Clearer context.
0
ZIP reports published
1,783
community water systems
411
systems with a health-based violation since 2016
159
systems that reached the lead action level since 2016
Counties
- Adams County 20 systems
- Alexander County 7 systems
- Bond County 9 systems
- Boone County 8 systems
- Brown County 5 systems
- Bureau County 25 systems
- Calhoun County 5 systems
- Carroll County 10 systems
- Cass County 7 systems
- Champaign County 32 systems
- Christian County 19 systems
- Clark County 6 systems
- Clay County 7 systems
- Clinton County 24 systems
- Coles County 9 systems
- Cook County 156 systems
- Crawford County 7 systems
- Cumberland County 5 systems
- De Witt County 8 systems
- DeKalb County 20 systems
- Douglas County 11 systems
- DuPage County 48 systems
- Edgar County 8 systems
- Edwards County 4 systems
- Effingham County 11 systems
- Fayette County 9 systems
- Ford County 13 systems
- Franklin County 22 systems
- Fulton County 23 systems
- Gallatin County 16 systems
- Greene County 10 systems
- Grundy County 19 systems
- Hamilton County 4 systems
- Hancock County 11 systems
- Hardin County 7 systems
- Henderson County 7 systems
- Henry County 39 systems
- Iroquois County 25 systems
- Jackson County 21 systems
- Jasper County 4 systems
- Jefferson County 11 systems
- Jersey County 6 systems
- Jo Daviess County 15 systems
- Johnson County 6 systems
- Kane County 40 systems
- Kankakee County 18 systems
- Kendall County 10 systems
- Knox County 19 systems
- LaSalle County 36 systems
- Lake County 102 systems
- Lawrence County 9 systems
- Lee County 15 systems
- Livingston County 18 systems
- Logan County 15 systems
- Macon County 13 systems
- Macoupin County 30 systems
- Madison County 36 systems
- Marion County 15 systems
- Marshall County 11 systems
- Mason County 9 systems
- Massac County 5 systems
- McDonough County 15 systems
- McHenry County 33 systems
- McLean County 35 systems
- Menard County 7 systems
- Mercer County 14 systems
- Monroe County 6 systems
- Montgomery County 18 systems
- Morgan County 14 systems
- Moultrie County 6 systems
- Ogle County 21 systems
- Peoria County 20 systems
- Perry County 6 systems
- Piatt County 9 systems
- Pike County 14 systems
- Pope County 2 systems
- Pulaski County 6 systems
- Putnam County 8 systems
- Randolph County 14 systems
- Richland County 11 systems
- Rock Island County 48 systems
- Saline County 12 systems
- Sangamon County 33 systems
- Schuyler County 5 systems
- Scott County 6 systems
- Shelby County 9 systems
- St. Clair County 24 systems
- Stark County 4 systems
- Stephenson County 13 systems
- Tazewell County 29 systems
- Union County 9 systems
- Vermilion County 20 systems
- Wabash County 5 systems
- Warren County 6 systems
- Washington County 12 systems
- Wayne County 10 systems
- White County 9 systems
- Whiteside County 11 systems
- Will County 51 systems
- Williamson County 24 systems
- Winnebago County 23 systems
- Woodford County 19 systems
ZIP reports
Sources
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.