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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
RPT	Notification, Known or Potential LSL	Lead and Copper Rule Revisions	LEAD AND COPPER RULE REVISIONS	2486999	Open	02-JUL-2025	-	No
RPT	LSL Reporting	Lead and Copper Rule Revisions	LEAD AND COPPER RULE REVISIONS	2486998	Returned to Compliance	17-OCT-2024	-	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	2486994	Known	01-APR-1994	30-APR-1994	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1978593	Known	01-SEP-1993	30-SEP-1993	No
MR	Monitoring, Repeat Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1978693	Known	01-AUG-1993	31-AUG-1993	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	1978493	Known	01-AUG-1993	31-AUG-1993	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
2127503	2486998	SIF	State Public Notification received	12-AUG-2025	State	-
2127502	2486999	SIE	State Public Notification requested	03-JUL-2025	State	-
2127494	2486994	SIA	State Violation/Reminder Notice	11-JUN-1994	State	-
2127094	1978593	SIF	State Public Notification received	08-NOV-1993	State	-
2127294	1978693	SIF	State Public Notification received	12-OCT-1993	State	-
2127394	1978493	SIF	State Public Notification received	12-OCT-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
CC 02-CRYSTAL LAKE MONTICELLO 3 OAKS	33768	Yes	Consecutive Connection	Ground water	Permanent	Active
WELL 1 (20165) ABANDONED	19880	Yes	Well	Ground water	Other	Inactive
CC 03-CRYSTAL LAKE SANDS RTE 14	33769	Yes	Consecutive Connection	Ground water	Permanent	Active
OAKBROOK ESTS MHP	24415	No	Distribution System/Zone	-	-	Active
GENERIC FINISHED SAMPLING STATION	28074	No	Sampling Station	-	-	Active
GENERIC RAW SAMPLING STATION	30496	No	Sampling Station	-	-	Active
DISTRIBUTION PRESSURE STORAGE	13589	No	Storage	-	-	Active

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Treatment Processes

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No treatment process(es) found. EPA has no record of treatment process(es) reported by the primacy agency for this water system.

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