OSWEGO, IL · Kendall County

OSWEGO Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Illinois’s official records. Always confirm current status with Illinois before making decisions based on this information.

System facts

System ID (PWSID): IL0930150
System type: Community Water System
Population served: 38,169
Service connections: 12,887
Ownership: local government
Water source: groundwater (wells)

Violation history

Monitoring and Reporting (DBP)
—
Chlorine
September 1, 2024 – September 30, 2024
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
July 1, 2022 – June 9, 2023
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
July 1, 2017 – June 25, 2018
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
May 14, 2017 – May 15, 2017
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2017 – March 31, 2017
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
July 1, 2016 – September 30, 2016
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
April 1, 2014 – June 30, 2014
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
April 1, 2010 – June 30, 2010
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
January 1, 2007 – March 31, 2007
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
July 1, 2006 – August 14, 2006
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2006 – March 31, 2006
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
July 1, 2005 – September 30, 2005
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
January 1, 2005 – March 25, 2005
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
October 1, 2004 – December 31, 2004
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
October 1, 2003 – December 31, 2003
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
July 1, 2003 – September 30, 2003
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
April 1, 2003 – June 30, 2003
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2003 – March 31, 2003
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
October 1, 2002 – December 31, 2002
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
March 31, 2001 – September 30, 2002
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
October 19, 1999 – March 16, 2000
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
February 1, 1999 – September 30, 2002
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
April 1, 1998 – April 30, 1998
Archived
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
March 1, 1998 – March 31, 1998
Archived
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
March 1, 1995 – January 31, 1999
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
July 1, 1992 – September 30, 1992
Resolved
Monitoring, Regular
—
1,2-Dichloroethane
July 1, 1992 – September 30, 1992
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
July 1, 1992 – September 30, 1992
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
July 1, 1992 – September 30, 1992
Resolved
Monitoring, Regular
—
CHLOROBENZENE
July 1, 1992 – September 30, 1992
Resolved
Monitoring, Regular
—
Carbon tetrachloride
July 1, 1992 – September 30, 1992
Resolved
Monitoring, Regular
—
1,1,1-Trichloroethane
July 1, 1992 – September 30, 1992
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
February 25, 1991 – February 24, 1995
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
April 1, 1984 – March 31, 1988
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
June 30, 1977 – June 29, 1981
Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
September 1, 2024 – September 30, 2024	Monitoring and Reporting (DBP)	Chlorine	—	Resolved
July 1, 2022 – June 9, 2023	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
July 1, 2017 – June 25, 2018	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
May 14, 2017 – May 15, 2017	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
January 1, 2017 – March 31, 2017	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
July 1, 2016 – September 30, 2016	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
April 1, 2014 – June 30, 2014	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
April 1, 2010 – June 30, 2010	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
January 1, 2007 – March 31, 2007	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
July 1, 2006 – August 14, 2006	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
January 1, 2006 – March 31, 2006	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
July 1, 2005 – September 30, 2005	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
January 1, 2005 – March 25, 2005	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
October 1, 2004 – December 31, 2004	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
October 1, 2003 – December 31, 2003	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
July 1, 2003 – September 30, 2003	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
April 1, 2003 – June 30, 2003	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
January 1, 2003 – March 31, 2003	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
October 1, 2002 – December 31, 2002	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
March 31, 2001 – September 30, 2002	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
October 19, 1999 – March 16, 2000	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
February 1, 1999 – September 30, 2002	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
April 1, 1998 – April 30, 1998	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
March 1, 1998 – March 31, 1998	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
March 1, 1995 – January 31, 1999	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
July 1, 1992 – September 30, 1992	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
July 1, 1992 – September 30, 1992	Monitoring, Regular	1,2-Dichloroethane	—	Resolved
July 1, 1992 – September 30, 1992	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
July 1, 1992 – September 30, 1992	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
July 1, 1992 – September 30, 1992	Monitoring, Regular	CHLOROBENZENE	—	Resolved
July 1, 1992 – September 30, 1992	Monitoring, Regular	Carbon tetrachloride	—	Resolved
July 1, 1992 – September 30, 1992	Monitoring, Regular	1,1,1-Trichloroethane	—	Resolved
February 25, 1991 – February 24, 1995	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
April 1, 1984 – March 31, 1988	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
June 30, 1977 – June 29, 1981	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

June 10, 2025State Public Notification received1 linked violation
November 1, 2024State Compliance achieved1 linked violation
October 22, 2024State Public Notification requested1 linked violation
October 22, 2024State Violation/Reminder Notice1 linked violation
June 9, 2023State Compliance achieved1 linked violation
July 27, 2022State Violation/Reminder Notice1 linked violation
June 25, 2018State Compliance achieved1 linked violation
August 27, 2017State Compliance achieved1 linked violation
August 10, 2017State Violation/Reminder Notice1 linked violation
June 14, 2017State Bilateral Compliance Agreement signed1 linked violation
June 13, 2017State Violation/Reminder Notice1 linked violation
May 18, 2017State Public Notification received1 linked violation
May 18, 2017State Public Notification received1 linked violation
May 15, 2017State Compliance achieved1 linked violation
April 26, 2017State Formal Notice of Violation issued1 linked violation
April 13, 2017State Violation/Reminder Notice1 linked violation
April 13, 2017State Public Notification requested1 linked violation
November 22, 2016State Compliance achieved1 linked violation
October 12, 2016State Violation/Reminder Notice1 linked violation
October 12, 2016State Public Notification requested1 linked violation
September 11, 2014State Public Notification received1 linked violation
August 25, 2014State Compliance achieved1 linked violation
July 11, 2014State Public Notification requested1 linked violation
July 11, 2014State Violation/Reminder Notice1 linked violation
November 18, 2010State Public Notification received1 linked violation
September 24, 2010State Compliance achieved1 linked violation
July 14, 2010State Violation/Reminder Notice1 linked violation
July 14, 2010State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
July 14, 2010State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
July 14, 2010State Public Notification requested1 linked violation
April 24, 2007State Compliance achieved1 linked violation
April 18, 2007State Violation/Reminder Notice1 linked violation
April 18, 2007State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
October 12, 2006State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
October 12, 2006State Violation/Reminder Notice1 linked violation
July 10, 2006State Violation/Reminder Notice6 linked violations
May 23, 2006State Compliance achieved21 linked violations
April 11, 2006State Public Notification requested6 linked violations
March 30, 2006State Public Notification received2 linked violations
February 22, 2006State Public Notification received2 linked violations
October 7, 2005State Violation/Reminder Notice2 linked violations
October 7, 2005State Public Notification requested1 linked violation
April 4, 2005State Public Notification received15 linked violations
March 25, 2005State Compliance achieved4 linked violations
March 25, 2005State Violation/Reminder Notice3 linked violations
March 1, 2005State Compliance achieved2 linked violations
February 9, 2005State Public Notification received1 linked violation
January 7, 2005State Public Notification requested1 linked violation
September 15, 2004State Public Notification received1 linked violation
August 16, 2004State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
August 16, 2004State Public Notification received2 linked violations
July 10, 2004State Violation/Reminder Notice1 linked violation
July 10, 2004State Public Notification requested1 linked violation
July 10, 2004State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
July 10, 2004State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
February 27, 2004State Public Notification receivedgeneral compliance action — not tied to a specific violation on record
April 10, 2003State Public Notification requested1 linked violation
April 10, 2003State Violation/Reminder Notice1 linked violation
April 10, 2003State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
April 10, 2003State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
January 10, 2003State Public Notification requested1 linked violation
January 10, 2003State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
December 20, 2001State Bilateral Compliance Agreement signed7 linked violations
March 16, 2000State Compliance achieved1 linked violation
February 28, 2000State Bilateral Compliance Agreement signed1 linked violation
February 7, 2000State Public Notification requested1 linked violation
February 7, 2000State Formal Notice of Violation issued2 linked violations
February 7, 2000State Violation/Reminder Notice1 linked violation
June 27, 1998State Violation/Reminder Notice1 linked violation
June 27, 1998State Public Notification requested1 linked violation
May 30, 1998State Violation/Reminder Notice1 linked violation
March 1, 1998State Public Notification received2 linked violations
December 1, 1997State Public Notification received2 linked violations
June 17, 1997State Public Notification received2 linked violations
February 25, 1997State Public Notification received2 linked violations
December 3, 1996State Public Notification received2 linked violations
September 1, 1996State Public Notification received2 linked violations
February 26, 1996State Public Notification received2 linked violations
October 4, 1995State Public Notification received2 linked violations
July 1, 1995State Public Notification received2 linked violations
April 1, 1995State Public Notification received2 linked violations
January 6, 1995State Public Notification received1 linked violation
January 1, 1995State Public Notification received1 linked violation
July 30, 1993State Compliance achieved17 linked violations
April 15, 1993State Public Notification received1 linked violation
January 1, 1993State Public Notification received1 linked violation
October 13, 1992State Public Notification received1 linked violation
August 5, 1992State Public Notification received1 linked violation
July 1, 1992State Public Notification requested18 linked violations
July 1, 1992State Violation/Reminder Notice18 linked violations
June 4, 1992State Public Notification received1 linked violation
May 7, 1992State Public Notification requested1 linked violation
March 12, 1992State Public Notification requested1 linked violation
December 11, 1991State Public Notification received1 linked violation
October 10, 1991State Administrative/Compliance Order without penalty issued2 linked violations
September 30, 1991State Public Notification received1 linked violation
August 22, 1991State Public Notification received1 linked violation
August 20, 1991State Public Notification requested1 linked violation
April 19, 1991State Public Notification received1 linked violation
February 25, 1991State Public Notification received1 linked violation

Contact

CASSIDY, CURTIS

630-551-2189

OSWEGO, IL 60543