Is WONDER LAKE (NIU) required to publish a Consumer Confidence Report?

Yes. WONDER LAKE (NIU) is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is WONDER LAKE (NIU)’s next Consumer Confidence Report due?

WONDER LAKE (NIU)’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

WONDER LAKE, IL · McHenry County

WONDER LAKE (NIU) Water System

Consumer Confidence Report status

WONDER LAKE (NIU) must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for WONDER LAKE (NIU).

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 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)

WONDER LAKE (NIU) is one of 773 community water systems in Illinois in the 501 to 3,300 people size category, serving 1,950 people from groundwater.

As of August 1, 2026, its federal record holds 65 entries between 1977 and 2024, all of which EPA lists as closed.

Of the 65, 62 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves volatile organic chemicals, the Total Coliform Rules, and inorganic chemicals.

Violation history

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
Maximum Contaminant Level Violation, Average
Health-based
Arsenic
April 1, 2013 – June 30, 2013
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
July 1, 1998 – July 31, 1998
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
June 1, 1998 – June 30, 1998
Archived
Monitoring, Repeat Minor (TCR)
—
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
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
May 1, 1993 – May 31, 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
—
o-Dichlorobenzene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
1,1-Dichloroethylene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
Styrene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
Ethylbenzene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
Toluene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
Benzene
April 1, 1993 – June 30, 1993
Archived
Monitoring, Regular
—
CHLOROBENZENE
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
—
Trichloroethylene
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 1993 – March 31, 1993
Archived
Monitoring, Regular
—
o-Dichlorobenzene
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
—
Styrene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
Toluene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
Benzene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
Trichloroethylene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
1,2-Dichloropropane
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
Carbon tetrachloride
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
Ethylbenzene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
trans-1,2-Dichloroethylene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
p-Dichlorobenzene
October 1, 1992 – December 31, 1992
Archived
Monitoring, Regular
—
1,2-Dichloropropane
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
—
1,1-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
—
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
—
Trichloroethylene
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
—
o-Dichlorobenzene
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 and Reporting (DBP)	Chlorine	—	Resolved
July 1, 2013 – September 30, 2013	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
April 1, 2013 – June 30, 2013	Maximum Contaminant Level Violation, Average	Arsenic	Health-based	Resolved
July 1, 1998 – July 31, 1998	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
June 1, 1998 – June 30, 1998	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
June 1, 1998 – June 30, 1998	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	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
May 1, 1993 – May 31, 1993	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	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
April 1, 1993 – June 30, 1993	Monitoring, Regular	o-Dichlorobenzene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	1,1-Dichloroethylene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	Styrene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	Ethylbenzene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	Toluene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	Benzene	—	Archived
April 1, 1993 – June 30, 1993	Monitoring, Regular	CHLOROBENZENE	—	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
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	o-Dichlorobenzene	—	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	Styrene	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	Toluene	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	Benzene	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	Trichloroethylene	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	1,2-Dichloropropane	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	Carbon tetrachloride	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	Ethylbenzene	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Archived
October 1, 1992 – December 31, 1992	Monitoring, Regular	p-Dichlorobenzene	—	Archived
July 1, 1992 – September 30, 1992	Monitoring, Regular	1,2-Dichloropropane	—	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	1,1-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	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	Trichloroethylene	—	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	o-Dichlorobenzene	—	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 Public Notification requested1 linked violation
December 23, 2024State Violation/Reminder Notice1 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 Violation/Reminder Notice1 linked violation
October 15, 2013State Compliance achieved2 linked violations
October 15, 2013State Public Notification requested1 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 Public Notification requested3 linked violations
September 15, 1998State Public Notification requested2 linked violations
August 15, 1998State Public Notification requested2 linked violations
August 15, 1998State Violation/Reminder Notice2 linked violations
February 5, 1994State Public Notification requested1 linked violation
February 5, 1994State Violation/Reminder Notice1 linked violation
February 5, 1994State Public Notification requested1 linked violation
January 8, 1994State Violation/Reminder Notice3 linked violations
January 8, 1994State Violation/Reminder Notice2 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 achieved3 linked violations
October 19, 1993State Compliance achieved5 linked violations
October 19, 1993State Compliance achieved7 linked violations
October 19, 1993State Compliance achieved7 linked violations
October 19, 1993State Compliance achieved5 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 achieved3 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 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 achieved4 linked violations
October 19, 1993State Compliance achieved5 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 achieved1 linked violation
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 achieved68 linked violations
July 10, 1993State Public Notification requested1 linked violation
July 10, 1993State Violation/Reminder Notice1 linked violation
July 7, 1993State Violation/Reminder Notice17 linked violations
July 7, 1993State Public Notification requested17 linked violations
April 20, 1993State Violation/Reminder Notice17 linked violations
April 20, 1993State Public Notification requested17 linked violations
January 19, 1993State Public Notification requested17 linked violations
January 19, 1993State Violation/Reminder Notice17 linked violations
July 1, 1992State Public Notification requested17 linked violations
July 1, 1992State Violation/Reminder Notice17 linked violations
June 26, 1990State Public Notification issuedgeneral compliance action — not tied to a specific violation on record
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

Common questions

Is WONDER LAKE (NIU) required to publish a Consumer Confidence Report?: Yes. WONDER LAKE (NIU) is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is WONDER LAKE (NIU)’s next Consumer Confidence Report due?: WONDER LAKE (NIU)’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does WONDER LAKE (NIU) have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for WONDER LAKE (NIU).
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

MANGUM, JAMES

815-277-9589

WONDER LAKE, IL 60097