Is WILLOWBROOK required to publish a Consumer Confidence Report?

Yes. WILLOWBROOK is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is WILLOWBROOK’s next Consumer Confidence Report due?

WILLOWBROOK’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

WILLOWBROOK, IL · DuPage County

WILLOWBROOK Water System

Consumer Confidence Report status

WILLOWBROOK must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for WILLOWBROOK.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 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)

WILLOWBROOK is one of 248 community water systems in Illinois in the 3,301 to 10,000 people size category, serving 9,000 people from surface water.

As of August 1, 2026, its federal record holds 2 entries between 1985 and 1993, all of which EPA lists as closed. Nothing has been added since 1993.

Of the 2, 1 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves the Total Coliform Rules and the Radionuclides and Revised Rad Rule.

Violation history

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

Archived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
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

Archived 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

Common questions

Is WILLOWBROOK required to publish a Consumer Confidence Report?: Yes. WILLOWBROOK is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is WILLOWBROOK’s next Consumer Confidence Report due?: WILLOWBROOK’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does WILLOWBROOK have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for WILLOWBROOK.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

HALLORAN, SEAN

630-323-8215

WILLOWBROOK, IL 60527