Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	IL0311770
PWS Name	MARKHAM
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water purchased
Primacy Type	State
Is Wholesaler?	No
Population Served	12500
County Served	Cook

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.

Violations

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	5360123	Open	02-JUL-2025	-	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	5360124	Open	01-JUL-2025	-	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	5360125	Returned to Compliance	01-JUL-2025	30-SEP-2025	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	5360120	Returned to Compliance	01-JUL-2023	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	5360122	Returned to Compliance	15-JUN-2023	-	No
Other	Public Notification Violation for NPDWR Violation	Public Notice Rule and Revised PN Rule	Public Notice	5360121	Returned to Compliance	15-JUN-2023	-	No
MON	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	Revised Total Coliform Rule	5360118	Returned to Compliance	01-MAY-2022	31-MAY-2022	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	5360119	Returned to Compliance	01-APR-2022	30-JUN-2022	No
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	5360117	Returned to Compliance	30-DEC-2020	-	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	5360115	Returned to Compliance	01-AUG-2013	31-AUG-2013	Yes
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	5360116	Returned to Compliance	01-JUL-2013	30-SEP-2013	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	5360114	Returned to Compliance	01-JUL-2011	-	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	5360112	Returned to Compliance	01-JAN-2011	31-MAR-2011	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Chlorine	5360111	Returned to Compliance	01-JAN-2011	31-MAR-2011	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	5360113	Returned to Compliance	01-JAN-2011	31-MAR-2011	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	5360110	Returned to Compliance	01-JAN-2011	31-JAN-2011	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	TTHM	5360107	Returned to Compliance	01-JUL-2007	30-SEP-2007	No
MR	Monitoring and Reporting (DBP)	Stage 1 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	5360108	Returned to Compliance	01-JUL-2007	30-SEP-2007	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	5359905	Returned to Compliance	01-JUL-2005	31-JUL-2005	Yes
MR	Monitoring, Repeat Major (TCR)	Total Coliform Rule	Coliform (TCR)	5359805	Returned to Compliance	01-JUL-2005	31-JUL-2005	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	5359605	Returned to Compliance	01-DEC-2004	31-DEC-2004	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	5359403	Returned to Compliance	01-JUN-2003	30-JUN-2003	Yes
MR	Monitoring, Repeat Minor (TCR)	Total Coliform Rule	Coliform (TCR)	3700497	Known	01-JAN-1997	31-JAN-1997	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	3700397	Known	01-JAN-1997	31-JAN-1997	Yes
MR	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	Lead and Copper Rule	3619196	Returned to Compliance	01-OCT-1996	-	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	3101895	Known	01-JUL-1995	31-JUL-1995	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	2732295	Known	01-OCT-1994	31-OCT-1994	No
MR	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	Lead and Copper Rule	5358594	Returned to Compliance	01-OCT-1994	-	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	2596094	Known	01-AUG-1994	31-AUG-1994	Yes
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	2422894	Known	01-JUN-1994	30-JUN-1994	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	2422994	Known	01-MAY-1994	31-MAY-1994	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	2422794	Known	01-APR-1994	30-APR-1994	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	1913093	Known	01-SEP-1993	30-SEP-1993	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1912993	Known	01-AUG-1993	31-AUG-1993	No
MR	Monitoring, Repeat Major (TCR)	Total Coliform Rule	Coliform (TCR)	1796993	Known	01-MAY-1993	31-MAY-1993	No
MCL	Maximum Contaminant Level Violation, Acute (TCR)	Total Coliform Rule	Coliform (TCR)	1796593	Known	01-MAY-1993	31-MAY-1993	Yes
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	1796693	Known	01-MAY-1993	31-MAY-1993	Yes
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1796893	Known	01-APR-1993	30-APR-1993	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1725993	Known	01-JAN-1993	31-JAN-1993	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1451892	Known	01-MAR-1992	31-MAR-1992	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	1451792	Known	01-JAN-1992	31-JAN-1992	No

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Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
8218550	5360125	SOX	State Compliance achieved	30-OCT-2025	State	-
8218547	5360124	SIA	State Violation/Reminder Notice	05-AUG-2025	State	-
8218546	5360123	SIE	State Public Notification requested	03-JUL-2025	State	-
8218542	5360119	SIF	State Public Notification received	24-JUN-2024	State	-
8218544	5360118	SIF	State Public Notification received	24-JUN-2024	State	-
8218543	5360122	SOX	State Compliance achieved	20-JUN-2024	State	-
8218541	5360121	SOX	State Compliance achieved	20-JUN-2024	State	-
8218537	5360120	SIA	State Violation/Reminder Notice	24-JUL-2023	State	-
8218531	5360117	SOX	State Compliance achieved	29-MAR-2021	State	-
8218529	5360115	SIF	State Public Notification received	21-OCT-2013	State	-
8218528	5360116	SIF	State Public Notification received	21-OCT-2013	State	-
8218522	5360113	SIF	State Public Notification received	04-APR-2012	State	-
8218522	5360112	SIF	State Public Notification received	04-APR-2012	State	-
8218520	5360111	SIF	State Public Notification received	09-FEB-2012	State	-
8218520	5360110	SIF	State Public Notification received	09-FEB-2012	State	-
8218519	5360114	SOX	State Compliance achieved	08-DEC-2011	State	-
8218508	5360108	SOX	State Compliance achieved	15-OCT-2007	State	-
8218508	5360107	SOX	State Compliance achieved	15-OCT-2007	State	-
8218306	5359605	SIF	State Public Notification received	15-MAR-2006	State	-
8218006	5359905	SOX	State Compliance achieved	01-FEB-2006	State	6 months without a coliform violation.
8218006	5359805	SOX	State Compliance achieved	01-FEB-2006	State	6 months without a coliform violation.
8218404	5359403	SOX	State Compliance achieved	01-JAN-2004	State	Supply without a coliform violation for 6 months.
7091098	3619196	SOX	State Compliance achieved	09-APR-1998	State	-
6139097	3700497	SIE	State Public Notification requested	20-MAR-1997	State	-
6139097	3700397	SIE	State Public Notification requested	20-MAR-1997	State	-
4924496	5358594	SOX	State Compliance achieved	31-DEC-1995	State	-
4743795	3101895	SIE	State Public Notification requested	17-SEP-1995	State	-
3813695	2732295	SIE	State Public Notification requested	17-DEC-1994	State	-
3813495	2596094	SIE	State Public Notification requested	15-OCT-1994	State	-
8216494	2422894	SIA	State Violation/Reminder Notice	20-AUG-1994	State	-
8216094	2422994	SIF	State Public Notification received	02-AUG-1994	State	-
8216594	2422794	SIA	State Violation/Reminder Notice	11-JUN-1994	State	-
8216794	1913093	SIA	State Violation/Reminder Notice	23-OCT-1993	State	-
2054393	1912993	SIE	State Public Notification requested	26-SEP-1993	State	-
1888893	1796593	SIE	State Public Notification requested	26-JUN-1993	State	-
1888893	1796693	SIE	State Public Notification requested	26-JUN-1993	State	-
1888893	1796993	SIE	State Public Notification requested	26-JUN-1993	State	-
1889393	1796893	SIF	State Public Notification received	03-JUN-1993	State	-
1724693	1725993	SIE	State Public Notification requested	28-FEB-1993	State	-
1254192	1451892	SIE	State Public Notification requested	24-APR-1992	State	-
1128792	1451792	SIE	State Public Notification requested	01-MAR-1992	State	-

1 - 41 of 41

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
CC 01-MIDMARK WATER COMM WATER	25860	Yes	Consecutive Connection	Surface water	Permanent	Active
MARKHAM	23372	No	Distribution System/Zone	-	-	Active
GENERIC FINISHED SAMPLING STATION	27031	No	Sampling Station	-	-	Active
GENERIC RAW SAMPLING STATION	29453	No	Sampling Station	-	-	Active
ELEV1-1.0 MG ELEVATED TANK	10980	No	Storage	-	-	Active
DISTRIBUTION GROUND STORAGE	12038	No	Storage	-	-	Active
GR02-1.0 MG GROUND TANK AT TP02	32545	No	Storage	-	-	Active
GR01-2.0 MG GROUND TANK AT TP01	43637	No	Storage	-	-	Active
TP 02-BOOSTER STATION	22746	No	Treatment Plant	-	-	Active
TP 01-MAIN PUMPING STATION	31896	No	Treatment Plant	-	-	Active

1 - 10 of 10

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TP 02-BOOSTER STATION	22746	Gaseous Chlorination, Post	Disinfection
TP 01-MAIN PUMPING STATION	31896	Gaseous Chlorination, Post	Disinfection

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For more information on a Water System:
Ask the operators of your water system, contact your primacy agency or file a Freedom of Information Act (FOIA) request.
Drinking water in general: Find out more about your drinking water web site or call the Safe Drinking Water Hotline (1-800-426-4791). EPA has also prepared a table about various regulated drinking water contaminants.
Tools for accessing EPA drinking water data: Safe Drinking Water Information System (SDWIS) Federal Reporting Services and Drinking Water Performance and Results Report.
Research Data: As well as monitoring the levels of drinking water contaminants for which EPA has set standards, EPA, states, and water systems also carry out studies of contaminants that may need to be regulated in the future. For more information about these contaminants, please see the National Contaminant Occurrence Database.

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