CHICAGO, IL · Cook County

CHICAGO Water System

Current status

2 items on record are open and awaiting resolution as of July 4, 2026. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings. Full details are in the violation history below.

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): IL0316000
System type: Community Water System
Population served: 2,746,388
Service connections: 484,979
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Notification, Known or Potential LSL
—
LEAD AND COPPER RULE REVISIONS
July 2, 2025
Unaddressed
Public Notification Violation for NPDWR Violation
—
Public Notice
June 15, 2025
Unaddressed
Monitoring, Turbidity (Enhanced SWTR)
—
Interim Enhanced Surface Water Treatment Rule
May 1, 2025 – May 31, 2025
Resolved
Monitoring, Turbidity (Enhanced SWTR)
—
Interim Enhanced Surface Water Treatment Rule
April 1, 2025 – April 30, 2025
Resolved
Monitoring and Reporting (DBP)
—
CARBON, TOTAL
July 1, 2024 – September 30, 2024
Resolved
Monitoring and Reporting (DBP)
—
CARBON, TOTAL
July 1, 2024 – September 30, 2024
Resolved
Monitoring and Reporting (DBP)
—
CARBON, TOTAL
July 1, 2024 – September 30, 2024
Resolved
Monitoring and Reporting (DBP)
—
CARBON, TOTAL
July 1, 2024 – September 30, 2024
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2021 – February 1, 2022
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2021 – August 5, 2021
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2020 – July 6, 2020
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Picloram
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Dinoseb
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Aldicarb sulfoxide
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Aldicarb sulfone
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Carbofuran
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Aldicarb
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Atrazine
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
LASSO
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Heptachlor
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
2,4-D
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
2,4,5-TP
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Pentachlorophenol
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
ETHYLENE DIBROMIDE
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Chlordane
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Heptachlor epoxide
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Endrin
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
BHC-GAMMA
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Toxaphene
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Dalapon
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Diquat
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Endothall
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
OXAMYL
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Regular
—
Simazine
January 1, 2019 – December 31, 2019
Resolved
Monitoring, Turbidity (Enhanced SWTR)
—
Interim Enhanced Surface Water Treatment Rule
November 1, 2016 – November 30, 2016
Resolved
Monitoring, Turbidity (Enhanced SWTR)
—
Interim Enhanced Surface Water Treatment Rule
October 1, 2016 – October 31, 2016
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2016 – August 3, 2016
Resolved
Monitoring, Turbidity (Enhanced SWTR)
—
Interim Enhanced Surface Water Treatment Rule
October 1, 2012 – October 31, 2012
Resolved
Monitoring, Turbidity (Enhanced SWTR)
—
Interim Enhanced Surface Water Treatment Rule
September 1, 2012 – September 30, 2012
Resolved
Monitoring, Turbidity (Enhanced SWTR)
—
Interim Enhanced Surface Water Treatment Rule
December 1, 2008 – December 31, 2008
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2003 – July 31, 2003
Resolved
OCCT/SOWT Study/Recommendation
Health-based
Lead and Copper Rule
January 7, 1993 – October 7, 1993
Resolved
Monitoring, Regular
—
Thallium, Total
January 1, 1993 – December 31, 1993
Resolved
Monitoring, Regular
—
Beryllium, Total
January 1, 1993 – December 31, 1993
Resolved
Monitoring, Regular
—
Antimony, Total
January 1, 1993 – December 31, 1993
Resolved

Unaddressed no corrective action on record yetResolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
July 2, 2025	Notification, Known or Potential LSL	LEAD AND COPPER RULE REVISIONS	—	Unaddressed
June 15, 2025	Public Notification Violation for NPDWR Violation	Public Notice	—	Unaddressed
May 1, 2025 – May 31, 2025	Monitoring, Turbidity (Enhanced SWTR)	Interim Enhanced Surface Water Treatment Rule	—	Resolved
April 1, 2025 – April 30, 2025	Monitoring, Turbidity (Enhanced SWTR)	Interim Enhanced Surface Water Treatment Rule	—	Resolved
July 1, 2024 – September 30, 2024	Monitoring and Reporting (DBP)	CARBON, TOTAL	—	Resolved
July 1, 2024 – September 30, 2024	Monitoring and Reporting (DBP)	CARBON, TOTAL	—	Resolved
July 1, 2024 – September 30, 2024	Monitoring and Reporting (DBP)	CARBON, TOTAL	—	Resolved
July 1, 2024 – September 30, 2024	Monitoring and Reporting (DBP)	CARBON, TOTAL	—	Resolved
December 30, 2021 – February 1, 2022	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
July 1, 2021 – August 5, 2021	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2020 – July 6, 2020	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Picloram	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Aldicarb sulfoxide	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Aldicarb sulfone	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Carbofuran	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Aldicarb	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Atrazine	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	LASSO	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Heptachlor	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	2,4-D	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	2,4,5-TP	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Pentachlorophenol	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Total Polychlorinated Biphenyls (PCB)	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Chlordane	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Endrin	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Methoxychlor	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Toxaphene	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Dalapon	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Diquat	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Endothall	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	OXAMYL	—	Resolved
January 1, 2019 – December 31, 2019	Monitoring, Regular	Simazine	—	Resolved
November 1, 2016 – November 30, 2016	Monitoring, Turbidity (Enhanced SWTR)	Interim Enhanced Surface Water Treatment Rule	—	Resolved
October 1, 2016 – October 31, 2016	Monitoring, Turbidity (Enhanced SWTR)	Interim Enhanced Surface Water Treatment Rule	—	Resolved
July 1, 2016 – August 3, 2016	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
October 1, 2012 – October 31, 2012	Monitoring, Turbidity (Enhanced SWTR)	Interim Enhanced Surface Water Treatment Rule	—	Resolved
September 1, 2012 – September 30, 2012	Monitoring, Turbidity (Enhanced SWTR)	Interim Enhanced Surface Water Treatment Rule	—	Resolved
December 1, 2008 – December 31, 2008	Monitoring, Turbidity (Enhanced SWTR)	Interim Enhanced Surface Water Treatment Rule	—	Resolved
July 1, 2003 – July 31, 2003	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
January 7, 1993 – October 7, 1993	OCCT/SOWT Study/Recommendation	Lead and Copper Rule	Health-based	Resolved
January 1, 1993 – December 31, 1993	Monitoring, Regular	Thallium, Total	—	Resolved
January 1, 1993 – December 31, 1993	Monitoring, Regular	Beryllium, Total	—	Resolved
January 1, 1993 – December 31, 1993	Monitoring, Regular	Antimony, Total	—	Resolved

Unaddressed no corrective action on record yetResolved addressed and confirmed by the state

Enforcement actions

July 21, 2025State Violation/Reminder Notice1 linked violation
July 10, 2025State Public Notification received1 linked violation
July 10, 2025State Public Notification received1 linked violation
July 10, 2025State Public Notification received1 linked violation
July 10, 2025State Public Notification received1 linked violation
July 9, 2025State Compliance achieved2 linked violations
July 3, 2025State Public Notification requested1 linked violation
July 3, 2025State Violation/Reminder Notice1 linked violation
July 1, 2025State Public Notification requested1 linked violation
July 1, 2025State Violation/Reminder Notice1 linked violation
May 15, 2025State Violation/Reminder Notice1 linked violation
May 15, 2025State Public Notification requested1 linked violation
November 8, 2024State Compliance achieved4 linked violations
October 15, 2024State Violation/Reminder Notice1 linked violation
October 15, 2024State Public Notification requested1 linked violation
October 15, 2024State Violation/Reminder Notice1 linked violation
October 15, 2024State Public Notification requested1 linked violation
October 15, 2024State Violation/Reminder Notice1 linked violation
October 15, 2024State Public Notification requested1 linked violation
October 15, 2024State Violation/Reminder Notice1 linked violation
October 15, 2024State Public Notification requested1 linked violation
February 1, 2022State Compliance achieved1 linked violation
January 19, 2022State Violation/Reminder Notice1 linked violation
August 5, 2021State Compliance achieved1 linked violation
July 22, 2021State Violation/Reminder Notice1 linked violation
October 2, 2020State Violation/Reminder Notice1 linked violation
July 28, 2020State Compliance achieved31 linked violations
July 10, 2020State Public Notification received31 linked violations
July 6, 2020State Compliance achieved1 linked violation
July 17, 2019State Public Notification requested31 linked violations
July 17, 2019State Violation/Reminder Notice31 linked violations
July 12, 2017State Public Notification received1 linked violation
July 12, 2017State Public Notification received1 linked violation
January 10, 2017State Compliance achieved2 linked violations
December 13, 2016State Violation/Reminder Notice1 linked violation
December 13, 2016State Public Notification requested1 linked violation
November 14, 2016State Violation/Reminder Notice1 linked violation
November 14, 2016State Public Notification requested1 linked violation
August 3, 2016State Compliance achieved1 linked violation
July 18, 2016State Violation/Reminder Notice1 linked violation
July 10, 2013State Public Notification received1 linked violation
July 10, 2013State Public Notification received1 linked violation
December 6, 2012State Compliance achieved2 linked violations
November 13, 2012State Public Notification requested1 linked violation
November 13, 2012State Violation/Reminder Notice1 linked violation
October 11, 2012State Public Notification requested1 linked violation
October 11, 2012State Violation/Reminder Notice1 linked violation
July 1, 2009State Public Notification received1 linked violation
February 9, 2009State Compliance achieved1 linked violation
January 13, 2009State Public Notification requested1 linked violation
January 13, 2009State Violation/Reminder Notice1 linked violation
July 31, 2003State Compliance achieved1 linked violation
July 10, 2003State Violation/Reminder Notice1 linked violation
August 24, 1995State Public Notification received1 linked violation
August 1, 1995State Compliance achieved1 linked violation
July 25, 1995State Public Notification requested1 linked violation
July 25, 1995State Violation/Reminder Notice1 linked violation
July 18, 1994State Public Notification received4 linked violations
July 18, 1994State Public Notification received2 linked violations
July 18, 1994State Public Notification received1 linked violation
July 18, 1994State Public Notification received1 linked violation
April 20, 1994State Public Notification requested2 linked violations
April 20, 1994State Violation/Reminder Notice2 linked violations
April 20, 1994State Violation/Reminder Notice1 linked violation
January 1, 1994State Compliance achieved2 linked violations
January 1, 1994State Compliance achieved2 linked violations
January 1, 1994State Compliance achieved4 linked violations
October 7, 1993State Compliance achieved2 linked violations
October 7, 1993State Compliance achieved1 linked violation
April 20, 1993State Violation/Reminder Notice1 linked violation
April 20, 1993State Public Notification requested1 linked violation

Contact

CONNER JR, ALFONZO (RANDY)

312-744-7001

CHICAGO, IL 60611