Mercer County, Illinois Water Systems

Mercer County, Illinois

19 community water systems on record — 14 active, 5 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 Mercer County, Illinois

System name	City	Population served	Status
ALEDO	ALEDO	3,470	Active
ASHS WELL 2 SBDV	PREEMPTION TWP	25	Inactive
ASHS WELL 4 SBDV	PREEMPTION TWP	32	Inactive
CAMPBELLS WTR CORP 1	PREEMPTION TWP	70	Inactive
FYRE LAKE WATER COMPANY	SHERRARD	760	Active
JOY	JOY	377	Active
KEITHSBURG	KEITHSBURG	747	Active
M C L W SYSTEM, INC.	MILAN	98	Active
MATHERVILLE	MATHERVILLE	651	Active
MERCER COUNTY ASH SUBD WE	MERCER COUNTY ASH SUBD WE	28	Inactive
MERCER COUNTY SW ASHLAND	MERCER COUNTY SW ASHLAND	28	Inactive
NEW BOSTON	NEW BOSTON	613	Active
NEW WINDSOR	NEW WINDSOR	740	Active
NORTH HENDERSON	NORTH HENDERSON	172	Active
SEATON	MUSCATINE	214	Active
SHERRARD	SHERRARD	785	Active
SWEDONA WATER ASSOCIATION	SHERRARD	109	Active
UNITY WATER CORPORATION	SHERRARD	93	Active
VIOLA	VIOLA	970	Active