MATTESON, IL · Cook County

MATTESON Water System

Current status

3 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): IL0311800
System type: Community Water System
Population served: 18,293
Service connections: 6,692
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
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
July 1, 2025
Unaddressed
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
July 1, 2025
Unaddressed
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2024 – December 31, 2024
Resolved
Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
October 1, 2024 – December 31, 2024
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
August 13, 2024 – June 26, 2024
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
August 13, 2024 – June 26, 2024
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
May 1, 2023 – May 31, 2023
Resolved
Monitoring and Reporting (DBP)
—
Chlorine
April 1, 2023 – June 26, 2023
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2020 – March 12, 2021
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2019 – July 24, 2019
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
June 30, 1977 – June 29, 1981
Archived

Unaddressed no corrective action on record yetResolved 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
July 2, 2025	Notification, Known or Potential LSL	LEAD AND COPPER RULE REVISIONS	—	Unaddressed
July 1, 2025	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Unaddressed
July 1, 2025	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Unaddressed
October 1, 2024 – December 31, 2024	Monitoring and Reporting (DBP)	TTHM	—	Resolved
October 1, 2024 – December 31, 2024	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
August 13, 2024 – June 26, 2024	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
August 13, 2024 – June 26, 2024	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
May 1, 2023 – May 31, 2023	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
April 1, 2023 – June 26, 2023	Monitoring and Reporting (DBP)	Chlorine	—	Resolved
December 30, 2020 – March 12, 2021	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
July 1, 2019 – July 24, 2019	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
June 30, 1977 – June 29, 1981	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

Unaddressed no corrective action on record yetResolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

September 22, 2025State Violation/Reminder Notice1 linked violation
July 29, 2025State Public Notification requested1 linked violation
July 29, 2025State Violation/Reminder Notice1 linked violation
July 3, 2025State Public Notification requested1 linked violation
July 3, 2025State Violation/Reminder Notice1 linked violation
April 10, 2025State Compliance achieved2 linked violations
January 14, 2025State Public Notification requested2 linked violations
January 14, 2025State Violation/Reminder Notice2 linked violations
September 19, 2024State Violation/Reminder Notice1 linked violation
September 19, 2024State Violation/Reminder Notice1 linked violation
July 8, 2024State Public Notification received1 linked violation
July 8, 2024State Public Notification received1 linked violation
June 26, 2024State Compliance achieved1 linked violation
June 26, 2024State Compliance achieved1 linked violation
August 13, 2023State Public Notification requested1 linked violation
August 13, 2023State Public Notification requested1 linked violation
August 13, 2023State Violation/Reminder Notice1 linked violation
August 13, 2023State Violation/Reminder Notice1 linked violation
June 26, 2023State Compliance achieved1 linked violation
June 26, 2023State Compliance achieved1 linked violation
March 12, 2021State Compliance achieved1 linked violation
January 6, 2021State Violation/Reminder Notice2 linked violations
July 24, 2019State Compliance achieved1 linked violation
July 17, 2019State Violation/Reminder Notice1 linked violation
April 1, 2006State Compliance achieved1 linked violation
November 17, 2005State Public Notification received1 linked violation
November 3, 2005State Violation/Reminder Notice1 linked violation
November 3, 2005State Public Notification requested1 linked violation
February 8, 1996State Public Notification received1 linked violation
January 20, 1996State Public Notification requested1 linked violation
January 20, 1996State Violation/Reminder Notice1 linked violation

Contact

HARDIN, GORDON

708-748-1411

MATTESON, IL 60443