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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
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	7137707	Open	01-JUL-2025	-	No
MR	Water Quality Parameter M/R	Lead and Copper Rule	Lead and Copper Rule	7137706	Returned to Compliance	01-JAN-2008	30-JUN-2008	No
TT	Single Turbidity Exceed (Enhanced SWTR)	Interim and Long Term 1 Enhanced Surface Water Treatment Rule	Interim Enhanced Surface Water Treatment Rule	7137705	Returned to Compliance	01-APR-2005	30-APR-2005	Yes
MR	Water Quality Parameter M/R	Lead and Copper Rule	Lead and Copper Rule	3807197	Returned to Compliance	01-JAN-1997	30-JUN-1997	No
MR	Water Quality Parameter M/R	Lead and Copper Rule	Lead and Copper Rule	3759796	Returned to Compliance	01-JUL-1996	31-DEC-1996	No
TT	OCCT/SOWT Study/Recommendation	Lead and Copper Rule	Lead and Copper Rule	1960893	Returned to Compliance	07-DEC-1992	-	Yes
MR	Water Quality Parameter M/R	Lead and Copper Rule	Lead and Copper Rule	1741392	Returned to Compliance	01-APR-1992	30-SEP-1992	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	7137580	Known	30-JUN-1977	29-JUN-1981	No

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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
7976509	7137707	SIA	State Violation/Reminder Notice	15-NOV-2025	State	-
7976506	7137706	SOX	State Compliance achieved	16-JUL-2008	State	Received WQP Form
7976505	7137705	SOX	State Compliance achieved	03-JUN-2005	State	-
7975999	3759796	SOX	State Compliance achieved	19-APR-1999	State	-
7975999	3807197	SOX	State Compliance achieved	19-APR-1999	State	-
1933694	1960893	SOX	State Compliance achieved	27-DEC-1993	State	-
1933493	1741392	SOX	State Compliance achieved	21-JUN-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-HIGHLAND PARK EMERGENCY CONNECTION	44326	Yes	Consecutive Connection	Surface water	Emergency	Active
WELL 3 (00726) INACTIVE ISWS MON WELL	18532	Yes	Well	Ground water	Other	Inactive
WELL 1 (00725) ABANDONED	18531	Yes	Well	Ground water	Other	Inactive
CC04-BUFFALO GROVE EMERGENCY CONNECTION	44327	Yes	Consecutive Connection	Surface water	Emergency	Active
CC05-VERNON HILLS EMERGENCY	44328	Yes	Consecutive Connection	Surface water	Emergency	Active
CC 01-DISCH TO DSTRB FROM HIGHLAND PK	26272	Yes	Consecutive Connection	Surface water	Permanent	Active
LINCOLNSHIRE	24164	No	Distribution System/Zone	-	-	Active
SCHOOL LEAD SAMPLING	45456	No	Distribution System/Zone	-	-	Active
CHILDCARE FACILITY LEAD SAMPLING	45457	No	Distribution System/Zone	-	-	Active
GENERIC FINISHED SAMPLING STATION	27823	No	Sampling Station	-	-	Active
GENERIC RAW SAMPLING STATION	30245	No	Sampling Station	-	-	Active
GR01-2.0 MG GROUND TANK AT EAST PS	12876	No	Storage	-	-	Active
GR02-2.6 MG GROUND TANK AT WEST PS	12877	No	Storage	-	-	Active
DISTRIBUTION GROUND STORAGE	12268	No	Storage	-	-	Inactive
TP 01-EASTSIDE RESERVOIR PS	16065	No	Treatment Plant	-	-	Active
TP 02-WESTSIDE RESERVOIR PS	32110	No	Treatment Plant	-	-	Active
TP 03-WELL 1 (ABANDONED)	16066	No	Treatment Plant	-	-	Inactive
TP 04-WELL 3 (ABANDONED)	16067	No	Treatment Plant	-	-	Inactive

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
TP 01-EASTSIDE RESERVOIR PS	16065	Hypochlorination, Post	Disinfection
TP 02-WESTSIDE RESERVOIR PS	32110	Hypochlorination, Post	Disinfection

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