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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	Total Haloacetic Acids (HAA5)	7118609	Returned to Compliance	01-JUL-2024	30-SEP-2024	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	7118610	Returned to Compliance	01-JUL-2024	-	No
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	7118608	Returned to Compliance	01-OCT-2023	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	7118605	Returned to Compliance	01-JAN-2005	31-MAR-2005	No
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	1126990	Returned to Compliance	01-OCT-1989	30-SEP-1993	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	237786	Returned to Compliance	01-DEC-1985	30-NOV-1989	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Combined Radium (-226 and -228)	237886	Returned to Compliance	04-OCT-1985	03-OCT-1989	Yes
MCL	Maximum Contaminant Level Violation, Average	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	237682	Known	02-DEC-1981	01-DEC-1985	Yes
MR	Monitoring, Regular	Radionuclides and Revised Rad Rule	Gross Alpha, Excl. Radon and U	7118480	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
1137415	7118609	SIF	State Public Notification received	23-JUN-2025	State	-
1137414	7118610	SOX	State Compliance achieved	11-JUN-2025	State	-
1137409	7118608	SIF	State Public Notification received	02-OCT-2024	State	-
1137405	7118605	SIF	State Public Notification received	13-JUN-2005	State	-
1136992	237886	SOX	State Compliance achieved	09-MAR-1992	State	-
1136992	1126990	SOX	State Compliance achieved	09-MAR-1992	State	-
386	237786	SIF	State Public Notification received	30-SEP-1986	State	-
582	237682	SIF	State Public Notification received	30-SEP-1982	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 12-ELMHURST INTER (EMERGENCY)	33758	Yes	Consecutive Connection	Surface water	Emergency	Active
WELL 3 (20761) ABANDONED	20464	Yes	Well	Ground water	Other	Inactive
WELL 2 (20760) ABANDONED	20463	Yes	Well	Ground water	Other	Inactive
WELL 1 (20759) ABANDONED	20462	Yes	Well	Ground water	Other	Inactive
WELL 7 (20764) EMERGENCY	20467	Yes	Well	Ground water	Emergency	Active
WELL 6 (20763) EMERGENCY	20466	Yes	Well	Ground water	Emergency	Active
WELL 5 (20762) EMERGENCY	20465	Yes	Well	Ground water	Emergency	Active
CC 08-MEYERS RD	26061	Yes	Consecutive Connection	Surface water	Permanent	Active
CC 09-RESERVOIR AV	26062	Yes	Consecutive Connection	Surface water	Permanent	Active
CC 10-35 ST AND HWY 83	26063	Yes	Consecutive Connection	Surface water	Permanent	Active
OAK BROOK	23588	No	Distribution System/Zone	-	-	Active
SCHOOL LEAD SAMPLING	45887	No	Distribution System/Zone	-	-	Active
CHILDCARE FACILITY LEAD SAMPLING	45889	No	Distribution System/Zone	-	-	Active
PF 11 - BOOSTER STATION LOW TO HIGH	39515	No	Pump Facility	-	-	Active
GENERIC FINISHED SAMPLING STATION	27247	No	Sampling Station	-	-	Active
GENERIC RAW SAMPLING STATION	29669	No	Sampling Station	-	-	Active
GR01-3.5 MG GROUND TANK AT TP01	12729	No	Storage	-	-	Active
GR08-4.0 MG GROUND TANK AT TP08	12730	No	Storage	-	-	Active
ELEV1-0.25 MG EAST SIDE	44545	No	Storage	-	-	Active
ELEV2-0.25 MG TOWER WEST SIDE	44546	No	Storage	-	-	Active
DISTRIBUTION ELEVATED STORAGE	11092	No	Storage	-	-	Inactive
DISTRIBUTION GROUND STORAGE	12133	No	Storage	-	-	Inactive
TP 05-WELL 5 (EMERGENCY)	15230	No	Treatment Plant	-	-	Active
TP 06-WELL 6 (EMERGENCY)	15231	No	Treatment Plant	-	-	Active
TP 07-WELL 7 (EMERGENCY)	15232	No	Treatment Plant	-	-	Active
TP 01-PUMPING STA/RESERVOIR A	22813	No	Treatment Plant	-	-	Active
TP 10-CONN. FR CC10 TO HIGH PRES SYSTEM	32035	No	Treatment Plant	-	-	Active
TP 08-CHLORIN AT MEYERS RD	32931	No	Treatment Plant	-	-	Active
TP 09-CHLORIN AT DELIVERY STA	32933	No	Treatment Plant	-	-	Active
TP 02-WELL 1 (ABANDONED)	15227	No	Treatment Plant	-	-	Inactive
TP 03-WELL 2 (ABANDONED)	15228	No	Treatment Plant	-	-	Inactive
TP 04-WELL 3 (ABANDONED)	15229	No	Treatment Plant	-	-	Inactive
TP 11-PUMPING STA/RESERVOIR B	22814	No	Treatment Plant	-	-	Inactive

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Treatment Processes

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Facility Name	Facility ID	Treatment Process	Treatment Objective
TP 05-WELL 5 (EMERGENCY)	15230	Hypochlorination, Post	Disinfection
TP 06-WELL 6 (EMERGENCY)	15231	Gaseous Chlorination, Pre	Disinfection
TP 07-WELL 7 (EMERGENCY)	15232	Gaseous Chlorination, Post	Disinfection
TP 01-PUMPING STA/RESERVOIR A	22813	Gaseous Chlorination, Post	Disinfection
TP 11-PUMPING STA/RESERVOIR B	22814	Gaseous Chlorination, Post	Disinfection
TP 10-CONN. FR CC10 TO HIGH PRES SYSTEM	32035	Gaseous Chlorination, Post	Disinfection
TP 08-CHLORIN AT MEYERS RD	32931	Gaseous Chlorination, Pre	Disinfection
TP 09-CHLORIN AT DELIVERY STA	32933	Gaseous Chlorination, Post	Disinfection

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