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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	7022513	Open	01-JUL-2025	-	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	7022512	Returned to Compliance	01-JUL-2021	-	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	7022508	Returned to Compliance	01-JUL-2012	-	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	7022507	Returned to Compliance	01-AUG-2011	31-AUG-2011	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	7022506	Returned to Compliance	01-JUN-2006	30-JUN-2006	Yes
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1457392	Known	01-FEB-1992	29-FEB-1992	No
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	7022280	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
1258124	7022513	SIA	State Violation/Reminder Notice	20-SEP-2025	State	-
1258123	7022512	SOX	State Compliance achieved	28-OCT-2021	State	-
1258113	7022508	SOX	State Compliance achieved	08-JUL-2013	State	-
1258111	7022507	SOX	State Compliance achieved	03-OCT-2011	State	Last September results entered 10/3/2011 and all were clean
1258107	7022506	SOX	State Compliance achieved	01-JAN-2007	State	SUPPLY WITHOUT TCR VIOLATIONS FOR 6 MOS
1257492	1457392	SIE	State Public Notification requested	03-APR-1992	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 06-MASTER -BEAU BIEN	26052	Yes	Consecutive Connection	Surface water	Permanent	Active
WELL 4 (20731) ABANDONED	20439	Yes	Well	Ground water	Other	Inactive
WELL 2 (20729) (ABANDONED)	20437	Yes	Well	Ground water	Other	Inactive
WELL 6 (20733) EMERGENCY	20441	Yes	Well	Ground water	Emergency	Active
WELL 5 (20732) EMERGENCY	20440	Yes	Well	Ground water	Emergency	Active
WELL 3 (20730) EMERGENCY	20438	Yes	Well	Ground water	Emergency	Active
CC 07-MASTER METER GREEN TRAILS RD	26053	Yes	Consecutive Connection	Surface water	Permanent	Active
CC 08-MASTER METER WARRENVILLE	26054	Yes	Consecutive Connection	Surface water	Permanent	Active
LISLE	23585	No	Distribution System/Zone	-	-	Active
SCHOOL LEAD SAMPLING	46313	No	Distribution System/Zone	-	-	Active
CHILD CARE FACILITIES LEAD SAMPLING	46314	No	Distribution System/Zone	-	-	Active
GENERIC FINISHED SAMPLING STATION	27244	No	Sampling Station	-	-	Active
GENERIC RAW SAMPLING STATION	29666	No	Sampling Station	-	-	Active
DISTRIBUTION ELEVATED STORAGE	11089	No	Storage	-	-	Active
DISTRIBUTION STANDPIPE STORAGE	14346	No	Storage	-	-	Active
GROUND STORAGE	35037	No	Storage	-	-	Active
DISTRIBUTION PRESSURE STORAGE	13297	No	Storage	-	-	Inactive
TP 02-WELL 3 (EMERGENCY)	15214	No	Treatment Plant	-	-	Active
TP 04-WELL 5 (EMERGENCY)	15216	No	Treatment Plant	-	-	Active
TP 05-WELL 6 (EMERGENCY)	15217	No	Treatment Plant	-	-	Active
TP09-BOOSTER STATION W/ CALC. HYPOCHLOR	35038	No	Treatment Plant	-	-	Active
CHLORINATED CC06 AT BEAU BIEN STATION	35039	No	Treatment Plant	-	-	Active
CHLORINATED CC07 AT GREEN TRAILS STATION	35040	No	Treatment Plant	-	-	Active
CHLORINATED CC08 AT WARRENVILLE STATION	35041	No	Treatment Plant	-	-	Active
TP 01-WELL 2 (EMERGENCY)	15213	No	Treatment Plant	-	-	Inactive
TP 03-WELL 4 (ABANDONED)	15215	No	Treatment Plant	-	-	Inactive

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
TP 01-WELL 2 (EMERGENCY)	15213	Gaseous Chlorination, Pre	Disinfection
TP 02-WELL 3 (EMERGENCY)	15214	Gaseous Chlorination, Pre	Disinfection
TP 04-WELL 5 (EMERGENCY)	15216	Gaseous Chlorination, Pre	Disinfection
TP 05-WELL 6 (EMERGENCY)	15217	Gaseous Chlorination, Pre	Disinfection
TP09-BOOSTER STATION W/ CALC. HYPOCHLOR	35038	Hypochlorination, Post	Disinfection
CHLORINATED CC06 AT BEAU BIEN STATION	35039	Gaseous Chlorination, Pre	Disinfection
CHLORINATED CC07 AT GREEN TRAILS STATION	35040	Gaseous Chlorination, Pre	Disinfection
CHLORINATED CC08 AT WARRENVILLE STATION	35041	Gaseous Chlorination, Pre	Disinfection

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