Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	IL1115850
PWS Name	WONDER LAKE (NIU)
PWS Type	Community water system
Owner Type	Local government
Primary Source	Ground water
Primacy Type	State
Is Wholesaler?	No
Population Served	1950
County Served	McHenry

The tables below list all violations that the state reported to EPA for this water system. Health-based violations are listed first, followed by treatment technique, MRDL, monitoring, reporting, and other violations.

Health-based	Violations of maximum contaminant levels (MCLs) or maximum residual disinfectant levels (MRDLs), which specify the highest concentrations of contaminants or disinfectants, respectively, allowed in drinking water; or of treatment technique (TT) rules, which specify required processes intended to reduce the amounts of contaminants in drinking water. MCLs, MRDLs, and treatment technique rules are all health-based drinking water standards.
Maximum Contaminant Level or MCL	The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
Treatment Technique	A required process intended to reduce the level of a contaminant in drinking water.
Maximum residual disinfectant level or MRDL	The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.
Monitoring & reporting	Failure to conduct regular monitoring of drinking water quality, as required by SDWA, or to submit monitoring results in a timely fashion to the primacy agency or EPA.
Public notification & other	Failure to provide notification to the public as required by the Violations of Public Notification Rule and the Consumer Confidence Report Rule, and violations of other requirements such as those violations related to variances and exemptions.

Violations

Violation Category Code	Violation Type Description	Rule Name	Contaminant Name	Violation ID	Compliance Status Description	Compliance Period Begin Date	Compliance Period End Date	Is Health Based Ind
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	7146515	Returned to Compliance	01-NOV-2024	30-NOV-2024	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	7146516	Returned to Compliance	01-NOV-2024	30-NOV-2024	No
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	7146508	Returned to Compliance	01-JUL-2013	30-SEP-2013	Yes
MCL	Maximum Contaminant Level Violation, Average	Arsenic Rule	Arsenic	7146507	Returned to Compliance	01-APR-2013	30-JUN-2013	Yes
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	7145905	Returned to Compliance	01-OCT-2004	-	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	5698802	Known	01-MAY-2002	31-MAY-2002	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	4209398	Known	01-JUL-1998	31-JUL-1998	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	4123898	Known	01-JUN-1998	30-JUN-1998	Yes
MR	Monitoring, Repeat Minor (TCR)	Total Coliform Rule	Coliform (TCR)	4123998	Known	01-JUN-1998	30-JUN-1998	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	2141994	Known	01-DEC-1993	31-DEC-1993	No
MR	Monitoring, Repeat Minor (TCR)	Total Coliform Rule	Coliform (TCR)	2142094	Known	01-NOV-1993	30-NOV-1993	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	2141894	Known	01-NOV-1993	30-NOV-1993	Yes
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1826093	Known	01-MAY-1993	31-MAY-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	1824893	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	1824793	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	1824693	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	1824993	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	1825093	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	1825193	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	1825293	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	1825393	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	1825493	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	1825593	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	1825693	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	1825793	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	1825893	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	1825993	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	1824593	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	1824493	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	2141793	Known	01-APR-1993	30-JUN-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	1755993	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Styrene	2141693	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	1757493	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Toluene	1757393	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Benzene	1757293	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	CHLOROBENZENE	1757193	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Tetrachloroethylene	1757093	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Trichloroethylene	1756993	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloropropane	1756893	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Carbon tetrachloride	1756793	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1,1-Trichloroethane	1756693	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,2-Dichloroethane	1756593	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	trans-1,2-Dichloroethylene	1756493	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	1,1-Dichloroethylene	1756393	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	p-Dichlorobenzene	1756293	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	o-Dichlorobenzene	1756193	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	1756093	Known	01-JAN-1993	31-MAR-1993	No
MR	Monitoring, Regular	Volatile Organic Chemicals	cis-1,2-Dichloroethylene	1679693	Known	01-OCT-1992	31-DEC-1992	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Xylenes, Total	1679793	Known	01-OCT-1992	31-DEC-1992	No
MR	Monitoring, Regular	Volatile Organic Chemicals	Ethylbenzene	1681193	Known	01-OCT-1992	31-DEC-1992	No

1 - 50 of 83

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
9944732	7146516	SIF	State Public Notification received	08-OCT-2025	State	-
9944733	7146515	SIF	State Public Notification received	08-OCT-2025	State	-
9944714	7146508	SIF	State Public Notification received	12-NOV-2013	State	-
9944715	7146507	SOX	State Compliance achieved	15-OCT-2013	State	Sample 3100765-01 submitted into SDWIS 10/15/13 brings the RAA to 0.010 mg/L. IEPA EDG "no further enforcement".
9944706	7145905	SIF	State Public Notification received	22-MAR-2006	State	-
9943203	5698802	SIF	State Public Notification received	16-MAY-2003	State	-
7363698	4209398	SIE	State Public Notification requested	15-SEP-1998	State	-
7363298	4123998	SIE	State Public Notification requested	15-AUG-1998	State	-
7363298	4123898	SIE	State Public Notification requested	15-AUG-1998	State	-
1E94	1595692	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1595792	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1595892	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1595992	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1596092	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1596192	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1596292	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1596392	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1596492	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1596592	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1596692	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1596792	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1596892	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1596992	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1597092	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1597192	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1679693	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1679793	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1679893	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1679993	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1680093	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1680193	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1680293	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1680393	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1680493	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1680593	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1680693	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1680793	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1680893	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1680993	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1681093	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1681193	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1755993	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1756093	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1756193	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1756293	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1756393	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1756493	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1756593	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1756693	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS
1E94	1756793	EF!	Federal Proposed Administrative Order Issued	11-APR-1994	ODSWeb	RS

1 - 50 of 82

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
WELL 2 (20148) EMERGENCY	19863	Yes	Well	Ground water	Emergency	Active
WELL #11 (02141)	43599	Yes	Well	Ground water	Permanent	Active
WELL #10 (02140)	43598	Yes	Well	Ground water	Permanent	Active
WELL 4 (01894) NEVER DRILLED	40294	Yes	Well	Ground water	Other	Inactive
WELL 3 (01893) NEVER DRILLED	40293	Yes	Well	Ground water	Other	Inactive
WELL 1 (20147) ABANDONED	19862	Yes	Well	Ground water	Other	Inactive
WONDER LAKE (NIU)	24432	No	Distribution System/Zone	-	-	Active
SCHOOL LEAD SAMPLING	45158	No	Distribution System/Zone	-	-	Active
GENERIC FINISHED SAMPLING STATION	28091	No	Sampling Station	-	-	Active
GENERIC RAW SAMPLING STATION	30513	No	Sampling Station	-	-	Active
GR1 - 450,000 GAL GROUND STORAGE	43601	No	Storage	-	-	Active
HD1 - 7500 GAL PRESSURE TANK	43602	No	Storage	-	-	Active
DISTRIBUTION ELEVATED STORAGE	11471	No	Storage	-	-	Inactive
TP01-TREATMENT PLANT (EMERGENCY)	16553	No	Treatment Plant	-	-	Active
TP02-WELL #10 & #11 IRON FILTRATION	43600	No	Treatment Plant	-	-	Active

1 - 15 of 15

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TP01-TREATMENT PLANT (EMERGENCY)	16553	Hypochlorination, Post	Disinfection
TP02-WELL #10 & #11 IRON FILTRATION	43600	Gaseous Chlorination, Pre	Iron removal
TP02-WELL #10 & #11 IRON FILTRATION	43600	Aeration, Diffused	Iron removal
TP02-WELL #10 & #11 IRON FILTRATION	43600	Filtration, Pressure Sand	Iron removal
TP02-WELL #10 & #11 IRON FILTRATION	43600	Gaseous Chlorination, Post	Disinfection
TP02-WELL #10 & #11 IRON FILTRATION	43600	Inhibitor, Polyphosphate	Corrosion control

1 - 6 of 6

For more information on a Water System:
Ask the operators of your water system, contact your primacy agency or file a Freedom of Information Act (FOIA) request.
Drinking water in general: Find out more about your drinking water web site or call the Safe Drinking Water Hotline (1-800-426-4791). EPA has also prepared a table about various regulated drinking water contaminants.
Tools for accessing EPA drinking water data: Safe Drinking Water Information System (SDWIS) Federal Reporting Services and Drinking Water Performance and Results Report.
Research Data: As well as monitoring the levels of drinking water contaminants for which EPA has set standards, EPA, states, and water systems also carry out studies of contaminants that may need to be regulated in the future. For more information about these contaminants, please see the National Contaminant Occurrence Database.

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