St. Clair County, Illinois Water Systems

St. Clair County, Illinois

42 community water systems on record — 27 active, 15 inactive.

Every active community water system nationwide must produce a Consumer Confidence Report under the EPA's revised rule, effective for reports due July 1, 2027.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Illinois’s official records. Always confirm current status with Illinois before making decisions based on this information.

Community water systems in St. Clair County, Illinois

System name	City	Population served	Status
AMERICAN WATER OPER AND MAINTENANCE, LLC	SCOTT AIR FORCE BASE	6,779	Active
ARAPAHO VILLAGE MHP	BELLEVILLE	368	Active
CAHOKIA	CAHOKIA	4,150	Inactive
CAHOKIA HEIGHTS	CAHOKIA HEIGHTS	15,250	Active
CASEYVILLE	CASEYVILLE	13,798	Active
COMMONFIELDS OF CAHOKIA PWD	CAHOKIA	11,030	Inactive
CONCORDIA WATER COOPERATIVE	JERSEYVILLE	510	Inactive
DUPO	DUPO	4,684	Active
FAYETTEVILLE	SWANSEA	441	Active
FREEBURG	FREEBURG	4,707	Active
FSH WATER COMMISSION	FREEBURG	313	Active
IL AMERICAN-EAST ST LOUIS	GODFREY	131,368	Active
ILDU LEPERE MHP, LLC	CEDAREDGE	250	Active
JOHN DESHIELDS FED HSNG CMPLX	EAST ST LOUIS	600	Inactive
KASKASKIA WATER DISTRICT	NEW ATHENS	0	Active
LEBANON	LEBANON	4,714	Active
LENZBURG	SWANSEA	616	Active
MARISSA	FREEBURG	1,921	Active
MASCOUTAH	MASCOUTAH	8,759	Active
MEADOWBROOK MH COMMUNITY, LLC	FARMINGTON HILLS	463	Active
MIDWEST ESTS SBDV	UNSPEC PL IN CO	25	Inactive
MILLSTADT	SWANSEA	4,071	Active
MOUND PWD	COLLINSVILLE	1,500	Active
NEW ATHENS	NEW ATHENS	1,970	Active
O FALLON	O'FALLON	46,603	Active
PARKVIEW MHP	O FALLON TWP	35	Inactive
PATRIOTS LANDING	UNSPEC PL IN CO	1,700	Inactive
PRAIRIE DUPONT PWD	EAST CARONDELET	1,863	Active
RANGELAND PARK MHP	O FALLON TWP	55	Inactive
S L M WATER COMMISSION	MASCOUTAH	385	Active
SAVE SITE	FREEBURG TWP	400	Inactive
SCHMID LAKE SUBDIVISION	SUGAR LOAF TWP	43	Inactive
SHILOH	SHILOH	4,000	Inactive
SMITHTON	SMITHTON	4,006	Active
SOUTHWESTERN IL CORRECTIONAL CENTER	EAST ST. LOUIS	563	Active
SPRING VALLEY MHP	SHILOH VAL TWP	40	Inactive
ST CLAIR COUNTY COZY ACRES	ST CLAIR COUNTY COZY ACRES	56	Inactive
ST LIBORY	SWANSEA	628	Active
ST OF ILL SIU E ST LOUIS	—	780	Inactive
SUMMERFIELD	SUMMERFIELD	347	Active
SWANSEA	SWANSEA	5,432	Inactive
VALLEY VIEW ESTATES	FARMINGTON HILLS	580	Active