WONDER LAKE, IL · McHenry County

WONDER LAKE (NIU) Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

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.

System facts

System ID (PWSID): IL1115850
System type: Community Water System
Population served: 1,950
Service connections: 780
Ownership: local government
Water source: groundwater (wells)

Violation history

Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
November 1, 2024 – November 30, 2024
Resolved
Monitoring and Reporting (DBP)
—
Chlorine
November 1, 2024 – November 30, 2024
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
July 1, 2013 – September 30, 2013
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
May 1, 2002 – May 31, 2002
Archived
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
July 1, 1998 – July 31, 1998
Archived
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
June 1, 1998 – June 30, 1998
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
June 1, 1998 – June 30, 1998
Archived
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
December 1, 1993 – December 31, 1993
Archived
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
November 1, 1993 – November 30, 1993
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
November 1, 1993 – November 30, 1993
Archived
Monitoring, Regular
—
1,1-Dichloroethylene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
cis-1,2-Dichloroethylene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
o-Dichlorobenzene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
Styrene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
Benzene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
Tetrachloroethylene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
Trichloroethylene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
1,2-Dichloropropane
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
Carbon tetrachloride
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
1,1,1-Trichloroethane
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
1,2-Dichloroethane
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
trans-1,2-Dichloroethylene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
Trichloroethylene
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
1,1,1-Trichloroethane
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
Carbon tetrachloride
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
1,2-Dichloropropane
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
Tetrachloroethylene
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
CHLOROBENZENE
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
Benzene
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
Toluene
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
Ethylbenzene
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
Styrene
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
Ethylbenzene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
Toluene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
1,2-Dichloropropane
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
1,1,1-Trichloroethane
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
trans-1,2-Dichloroethylene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
1,1-Dichloroethylene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
cis-1,2-Dichloroethylene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
Styrene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
Trichloroethylene
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
1,2-Dichloropropane
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
Carbon tetrachloride
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
1,1,1-Trichloroethane
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
1,2-Dichloroethane
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
trans-1,2-Dichloroethylene
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
o-Dichlorobenzene
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
Ethylbenzene
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
Toluene
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
Benzene
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
CHLOROBENZENE
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
Tetrachloroethylene
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
Styrene
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
cis-1,2-Dichloroethylene
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
p-Dichlorobenzene
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
Xylenes, Total
July 1, 1992 – September 30, 1992
Archived
Monitoring, Regular
—
1,1-Dichloroethylene
July 1, 1992 – September 30, 1992
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 1, 1991 – November 30, 1991
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
June 30, 1977 – June 29, 1981
Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
November 1, 2024 – November 30, 2024	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
November 1, 2024 – November 30, 2024	Monitoring and Reporting (DBP)	Chlorine	—	Resolved
July 1, 2013 – September 30, 2013	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
May 1, 2002 – May 31, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
July 1, 1998 – July 31, 1998	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
June 1, 1998 – June 30, 1998	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Archived
June 1, 1998 – June 30, 1998	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
December 1, 1993 – December 31, 1993	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
November 1, 1993 – November 30, 1993	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	Archived
November 1, 1993 – November 30, 1993	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	1,1-Dichloroethylene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	o-Dichlorobenzene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	Styrene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	Benzene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	Tetrachloroethylene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	Trichloroethylene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	1,2-Dichloropropane	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	Carbon tetrachloride	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	1,1,1-Trichloroethane	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	1,2-Dichloroethane	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	Trichloroethylene	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	1,1-Dichloroethylene	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	1,2-Dichloroethane	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	1,1,1-Trichloroethane	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	Carbon tetrachloride	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	1,2-Dichloropropane	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	Tetrachloroethylene	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	CHLOROBENZENE	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	Benzene	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	Toluene	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	Ethylbenzene	—	Archived
January 1, 1993 – March 31, 1993	Monitoring, Regular	Styrene	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	Ethylbenzene	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	Toluene	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	1,2-Dichloropropane	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	1,1,1-Trichloroethane	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	1,1-Dichloroethylene	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	Styrene	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	Trichloroethylene	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	1,2-Dichloropropane	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	Carbon tetrachloride	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	1,1,1-Trichloroethane	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	1,2-Dichloroethane	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	o-Dichlorobenzene	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	Ethylbenzene	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	Toluene	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	Benzene	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	CHLOROBENZENE	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	Tetrachloroethylene	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	Styrene	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	p-Dichlorobenzene	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	Xylenes, Total	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	1,1-Dichloroethylene	—	Archived
November 1, 1991 – November 30, 1991	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
June 30, 1977 – June 29, 1981	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

October 8, 2025State Public Notification received1 linked violation
October 8, 2025State Public Notification received1 linked violation
December 23, 2024State Violation/Reminder Notice1 linked violation
December 23, 2024State Public Notification requested1 linked violation
December 23, 2024State Violation/Reminder Notice1 linked violation
December 23, 2024State Public Notification requested1 linked violation
December 18, 2024State Compliance achieved1 linked violation
December 18, 2024State Compliance achieved1 linked violation
November 12, 2013State Public Notification received1 linked violation
October 15, 2013State Compliance achieved2 linked violations
October 15, 2013State Public Notification requested1 linked violation
October 15, 2013State Violation/Reminder Notice1 linked violation
October 4, 2013State Compliance Meeting conducted2 linked violations
August 26, 2013State Public Notification received1 linked violation
August 12, 2013State Formal Notice of Violation issued2 linked violations
July 23, 2013State Violation/Reminder Notice1 linked violation
July 23, 2013State Public Notification requested1 linked violation
March 22, 2006State Public Notification received1 linked violation
September 30, 2005State Compliance achieved1 linked violation
February 7, 2005State Violation/Reminder Notice2 linked violations
February 7, 2005State Public Notification requested2 linked violations
May 16, 2003State Public Notification received1 linked violation
August 29, 2002State Violation/Reminder Notice4 linked violations
August 15, 1998State Violation/Reminder Notice2 linked violations
August 15, 1998State Public Notification requested2 linked violations
February 5, 1994State Public Notification requested1 linked violation
February 5, 1994State Public Notification requested1 linked violation
February 5, 1994State Violation/Reminder Notice1 linked violation
January 8, 1994State Public Notification requested3 linked violations
January 8, 1994State Violation/Reminder Notice2 linked violations
January 8, 1994State Violation/Reminder Notice3 linked violations
January 8, 1994State Public Notification requested2 linked violations
January 8, 1994State Violation/Reminder Notice2 linked violations
January 8, 1994State Public Notification requested2 linked violations
October 19, 1993State Compliance achieved2 linked violations
October 19, 1993State Compliance achieved5 linked violations
October 19, 1993State Compliance achieved6 linked violations
October 19, 1993State Compliance achieved7 linked violations
October 19, 1993State Compliance achieved3 linked violations
October 19, 1993State Compliance achieved3 linked violations
October 19, 1993State Compliance achieved3 linked violations
October 19, 1993State Compliance achieved4 linked violations
October 19, 1993State Compliance achieved4 linked violations
October 19, 1993State Compliance achieved2 linked violations
October 19, 1993State Compliance achieved2 linked violations
October 19, 1993State Compliance achieved2 linked violations
October 19, 1993State Compliance achieved1 linked violation
October 19, 1993State Compliance achieved1 linked violation
October 19, 1993State Compliance achieved4 linked violations
October 19, 1993State Compliance achieved3 linked violations
October 19, 1993State Compliance achieved4 linked violations
October 19, 1993State Compliance achieved1 linked violation
October 19, 1993State Compliance achieved1 linked violation
October 19, 1993State Compliance achieved2 linked violations
October 19, 1993State Compliance achieved2 linked violations
October 19, 1993State Compliance achieved68 linked violations
July 10, 1993State Public Notification requested1 linked violation
July 10, 1993State Violation/Reminder Notice1 linked violation
July 7, 1993State Public Notification requested17 linked violations
July 7, 1993State Violation/Reminder Notice17 linked violations
April 20, 1993State Public Notification requested17 linked violations
April 20, 1993State Violation/Reminder Notice17 linked violations
January 19, 1993State Violation/Reminder Notice17 linked violations
January 19, 1993State Public Notification requested17 linked violations
July 1, 1992State Violation/Reminder Notice17 linked violations
July 1, 1992State Public Notification requested17 linked violations
January 11, 1992State Violation/Reminder Notice1 linked violation
June 26, 1990State Public Notification issuedgeneral compliance action — not tied to a specific violation on record
April 12, 1990State Violation/Reminder Notice1 linked violation
April 12, 1990State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
January 13, 1990State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
January 13, 1990State Public Notification requested3 linked violations

Contact

MANGUM, JAMES

815-277-9589

WONDER LAKE, IL 60097