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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.

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Violations

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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
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	5289208	Returned to Compliance	01-JAN-2025	31-MAR-2025	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	5289207	Returned to Compliance	01-AUG-2010	31-AUG-2010	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	5288603	Returned to Compliance	01-JAN-2003	31-MAR-2003	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	5288403	Returned to Compliance	01-OCT-2002	31-DEC-2002	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	5288001	Returned to Compliance	14-FEB-2001	30-SEP-2002	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	4415899	Returned to Compliance	01-JAN-1999	22-FEB-2000	Yes
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	4094098	Returned to Compliance	01-JUL-1998	-	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	2868395	Returned to Compliance	01-JAN-1995	28-FEB-1995	Yes
TT	OCCT/SOWT Study/Recommendation	Lead and Copper Rule	Lead and Copper Rule	2868494	Returned to Compliance	01-JAN-1994	-	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	1382892	Returned to Compliance	01-NOV-1991	31-OCT-1995	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	404188	Returned to Compliance	30-NOV-1987	29-NOV-1991	Yes

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Enforcement Actions

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Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
8355614	5289208	SIF	State Public Notification received	24-JUN-2025	State	-
8355611	5289207	SIF	State Public Notification received	22-OCT-2010	State	-
8355303	5288603	SIE	State Public Notification requested	10-APR-2003	State	-
1003	5288001	SOX	State Compliance achieved	28-FEB-2003	State	Began Purchasing Lake Michigan Water
1003	5288403	SOX	State Compliance achieved	28-FEB-2003	State	Began Purchasing Lake Michigan Water
3000	4415899	SOX	State Compliance achieved	22-FEB-2000	State	-
8354799	4094098	SOX	State Compliance achieved	31-DEC-1998	State	-
4347095	2868395	SOX	State Compliance achieved	28-FEB-1995	State	-
4116295	2868494	SOX	State Compliance achieved	03-JAN-1995	State	-
1725393	404188	SOX	State Compliance achieved	19-FEB-1993	State	-
1725393	1382892	SOX	State Compliance achieved	19-FEB-1993	State	-

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All Facilities

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Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
CC03-EMER CONN W/IAWC-CHICAGO SUBURBAN	40285	Yes	Consecutive Connection	Surface water	Other	Inactive
WELL 1 (20652) - ABANDONED	20360	Yes	Well	Ground water	Other	Inactive
WELL 2 (20653) EMER	20361	Yes	Well	Ground water	Emergency	Active
CC 02-CONNECTION W/ CHICAGO SUBURBAN	33381	Yes	Consecutive Connection	Surface water	Permanent	Active
PROSPECT HEIGHTS	23399	No	Distribution System/Zone	-	-	Active
IDSE	35033	No	Distribution System/Zone	-	-	Active
SCHOOL LEAD SAMPLING	45237	No	Distribution System/Zone	-	-	Active
GENERIC FINISHED SAMPLING STATION	27058	No	Sampling Station	-	-	Active
GENERIC RAW SAMPLING STATION	29480	No	Sampling Station	-	-	Active
PEAKING STATION GROUND STORAGE	12060	No	Storage	-	-	Active
TAP 01 GROUND STORAGE	12645	No	Storage	-	-	Inactive
DISTRIBUTION PRESSURE STORAGE-ABANDONED	13257	No	Storage	-	-	Inactive
TAP 01 PRESSURE STORAGE - ABANDONED	13973	No	Storage	-	-	Inactive
TP 01- PEAKING ST W/ CL2 & EMERG WELL 2	14802	No	Treatment Plant	-	-	Active

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
TP 01- PEAKING ST W/ CL2 & EMERG WELL 2	14802	Hypochlorination, Post	Disinfection

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