Safe Drinking Water Information System (SDWIS) Federal Reporting Services

Your Drinking Water Query results from SDWIS Fed Reporting Services

PWS ID	IL0312520
PWS Name	POSEN
PWS Type	Community water system
Owner Type	Local government
Primary Source	Surface water purchased
Primacy Type	State
Is Wholesaler?	No
Population Served	5331
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	5412816	Returned to Compliance	02-JUL-2025	-	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	5412818	Open	01-JUL-2025	-	No
MR	Lead Consumer Notice	Lead and Copper Rule	Lead and Copper Rule	5412815	Returned to Compliance	30-DEC-2020	-	No
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	5412814	Returned to Compliance	01-JUL-2017	-	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	5412811	Returned to Compliance	01-JUL-2014	-	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	TTHM	5412812	Returned to Compliance	01-JAN-2014	31-AUG-2014	No
MR	Monitoring and Reporting (DBP)	Stage 2 Disinfectants and Disinfection Byproducts Rule	Total Haloacetic Acids (HAA5)	5412813	Returned to Compliance	01-JAN-2014	31-AUG-2014	No
MCL	Maximum Contaminant Level Violation, Monthly (TCR)	Total Coliform Rule	Coliform (TCR)	5412810	Returned to Compliance	01-JUN-2013	30-JUN-2013	Yes
Other	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	Consumer Confidence Rule	5412809	Returned to Compliance	01-JUL-2012	-	No
MR	Water Quality Parameter M/R	Lead and Copper Rule	Lead and Copper Rule	5412807	Returned to Compliance	01-JUL-2007	31-DEC-2007	No
Other	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	Consumer Confidence Rule	5412504	Returned to Compliance	01-JUL-2004	-	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	4488102	Known	01-OCT-2002	31-OCT-2002	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	5411402	Known	01-NOV-2001	30-NOV-2001	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	5411302	Known	01-OCT-2001	31-OCT-2001	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	5287701	Known	01-MAR-2001	31-MAR-2001	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	5287601	Known	01-FEB-2001	28-FEB-2001	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	5240901	Known	01-OCT-2000	31-OCT-2000	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	5181800	Known	01-AUG-2000	31-AUG-2000	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	5181700	Known	01-JUL-2000	31-JUL-2000	No
MR	Monitoring, Routine Major (TCR)	Total Coliform Rule	Coliform (TCR)	4654900	Known	01-OCT-1999	31-OCT-1999	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	4487999	Known	01-APR-1999	30-APR-1999	No
MR	Monitoring, Routine Minor (TCR)	Total Coliform Rule	Coliform (TCR)	4093998	Known	01-JUN-1998	30-JUN-1998	No
MR	Water Quality Parameter M/R	Lead and Copper Rule	Lead and Copper Rule	3786697	Returned to Compliance	01-JAN-1997	30-JUN-1997	No
TT	Public Education	Lead and Copper Rule	Lead and Copper Rule	3619596	Returned to Compliance	01-JAN-1996	-	Yes
TT	OCCT/SOWT Study/Recommendation	Lead and Copper Rule	Lead and Copper Rule	1914493	Returned to Compliance	21-DEC-1992	-	Yes

1 - 25 of 25

Enforcement Actions

Latest Enforcement ID	Associated To Violation ID	Enforcement Action Type Code	Enforcement Action Description	Enforcement Date	Originator Description	Enforcement Comment
8356324	5412816	SIF	State Public Notification received	11-SEP-2025	State	-
8356323	5412818	SIA	State Violation/Reminder Notice	06-SEP-2025	State	-
8356320	5412815	SOX	State Compliance achieved	02-FEB-2021	State	-
8356317	5412814	SIA	State Violation/Reminder Notice	18-JUL-2017	State	-
8356316	5412813	SOX	State Compliance achieved	23-SEP-2015	State	-
8356316	5412812	SOX	State Compliance achieved	23-SEP-2015	State	-
8356312	5412811	SOX	State Compliance achieved	08-SEP-2014	State	-
8356309	5412810	SIF	State Public Notification received	15-AUG-2013	State	-
8356306	5412809	SOX	State Compliance achieved	02-AUG-2012	State	-
8356304	5412807	SOX	State Compliance achieved	04-FEB-2008	State	Received WQP Form
8355905	5412504	SOX	State Compliance achieved	30-JUN-2005	State	-
203	4488102	SIE	State Public Notification requested	18-DEC-2002	State	-
827802	5411402	SIE	State Public Notification requested	15-JAN-2002	State	-
774502	5411302	SIE	State Public Notification requested	15-DEC-2001	State	-
499201	5287701	SIE	State Public Notification requested	15-MAY-2001	State	-
499001	5287601	SIE	State Public Notification requested	15-APR-2001	State	-
304201	5240901	SIE	State Public Notification requested	15-DEC-2000	State	-
304001	5181800	SIE	State Public Notification requested	15-OCT-2000	State	-
114100	5181700	SIE	State Public Notification requested	15-SEP-2000	State	-
8354600	4654900	SIE	State Public Notification requested	15-DEC-1999	State	-
7959699	4487999	SIE	State Public Notification requested	15-JUN-1999	State	-
7313698	4093998	SIE	State Public Notification requested	15-AUG-1998	State	-
7092098	3786697	SOX	State Compliance achieved	09-APR-1998	State	-
6919298	3619596	SOX	State Compliance achieved	09-FEB-1998	State	-
199994	1914493	SOX	State Compliance achieved	21-MAR-1994	State	-

1 - 25 of 25

All Facilities

Facility Name	Facility ID	Is Source	Facility Type Description	Water Type Description	Availability Description	Facility Activity Status
CC 01-PUMPING STATION	25892	Yes	Consecutive Connection	Surface water	Permanent	Active
POSEN	23398	No	Distribution System/Zone	-	-	Active
SCHOOL LEAD SAMPLING	47010	No	Distribution System/Zone	-	-	Active
CHILDCARE FACILITY LEAD SAMPLING	47011	No	Distribution System/Zone	-	-	Active
GENERIC FINISHED SAMPLING STATION	27057	No	Sampling Station	-	-	Active
GENERIC RAW SAMPLING STATION	29479	No	Sampling Station	-	-	Active
GR01-1.0 MG GROUND TANK AT TP01	12644	No	Storage	-	-	Active
DISTRIBUTION GROUND STORAGE	12059	No	Storage	-	-	Inactive
TP 01-PUMPING STATION	31928	No	Treatment Plant	-	-	Active

1 - 9 of 9

Treatment Processes

Facility Name	Facility ID	Treatment Process	Treatment Objective
TP 01-PUMPING STATION	31928	Gaseous Chlorination, Pre	Disinfection

1 - 1 of 1

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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