WILLOWBROOK, IL · DuPage County

WILLOWBROOK 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): IL0431100
System type: Community Water System
Population served: 9,000
Service connections: 2,207
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
Monitoring and Reporting (DBP)
—
TTHM
October 1, 2024 – December 31, 2024
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
July 1, 2023 – February 5, 2024
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
July 1, 2022 – February 5, 2024
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2020 – January 14, 2021
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
July 1, 1993 – July 31, 1993
Archived
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
December 6, 1985 – December 5, 1989
Archived
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
October 1, 2024 – December 31, 2024	Monitoring and Reporting (DBP)	TTHM	—	Resolved
July 1, 2023 – February 5, 2024	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
July 1, 2022 – February 5, 2024	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
December 30, 2020 – January 14, 2021	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
July 1, 1993 – July 31, 1993	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
December 6, 1985 – December 5, 1989	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived
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 6, 2025State Violation/Reminder Notice1 linked violation
August 26, 2025State Public Notification received2 linked violations
July 3, 2025State Public Notification requested1 linked violation
July 3, 2025State Violation/Reminder Notice1 linked violation
April 2, 2025State Compliance achieved2 linked violations
January 14, 2025State Violation/Reminder Notice2 linked violations
January 14, 2025State Public Notification requested2 linked violations
February 5, 2024State Compliance achieved2 linked violations
December 14, 2023State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
December 14, 2023State Violation/Reminder Notice1 linked violation
July 27, 2022State Violation/Reminder Notice1 linked violation
August 2, 2021State Compliance achieved1 linked violation
July 22, 2021State Violation/Reminder Notice1 linked violation
January 14, 2021State Compliance achieved1 linked violation
January 6, 2021State Violation/Reminder Notice1 linked violation
July 29, 2013State Compliance achieved1 linked violation
July 25, 2013State Violation/Reminder Notice1 linked violation
September 10, 1993State Public Notification received1 linked violation
September 4, 1993State Public Notification requested1 linked violation
September 4, 1993State Violation/Reminder Notice1 linked violation
December 31, 1988State Public Notification received1 linked violation

Contact

HALLORAN, SEAN

630-323-8215

WILLOWBROOK, IL 60527