Is CLARENDON HILLS required to publish a Consumer Confidence Report?

Yes. CLARENDON HILLS 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 CLARENDON HILLS’s next Consumer Confidence Report due?

CLARENDON HILLS’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.

CLARENDON HILLS, IL · DuPage County

CLARENDON HILLS Water System

Consumer Confidence Report status

CLARENDON HILLS 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 CLARENDON HILLS.

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): IL0430250
System type: Community Water System
Population served: 8,702
Service connections: 2,742
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

CLARENDON HILLS is one of 248 community water systems in Illinois in the 3,301 to 10,000 people size category, serving 8,702 people from surface water.

As of August 1, 2026, its federal record holds 4 entries between 1977 and 2023, all of which EPA lists as closed. Nothing has been added since 2023.

Of the 4, 3 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 Radionuclides and Revised Rad Rule, the Lead and Copper Rule, and the Consumer Confidence Rule.

Violation history

Monitoring, Regular
—
Combined Radium (-226 and -228)
January 1, 2023 – December 31, 2025
Archived
Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2020 – January 14, 2021
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
July 1, 2017 – July 2, 2018
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
June 30, 1977 – June 29, 1981
Archived

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

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2023 – December 31, 2025	Monitoring, Regular	Combined Radium (-226 and -228)	—	Archived
December 30, 2020 – January 14, 2021	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
July 1, 2017 – July 2, 2018	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
June 30, 1977 – June 29, 1981	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

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

Enforcement actions

February 20, 2026State Compliance achievedgeneral compliance action — not tied to a specific violation on record
January 14, 2026State Public Notification requested1 linked violation
January 14, 2026State Violation/Reminder Notice1 linked violation
January 14, 2026State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
January 14, 2026State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
January 14, 2021State Compliance achieved1 linked violation
January 6, 2021State Violation/Reminder Notice1 linked violation
July 2, 2018State Compliance achieved1 linked violation
August 25, 2017State Violation/Reminder Notice1 linked violation
November 27, 1996State Public Notification received1 linked violation
October 26, 1996State Public Notification requested1 linked violation
October 26, 1996State Violation/Reminder Notice1 linked violation
October 31, 1992State Public Notification requested1 linked violation
October 31, 1992State Violation/Reminder Notice1 linked violation
October 8, 1989State Public Notification requestedgeneral compliance action — not tied to a specific violation on record

Common questions

Is CLARENDON HILLS required to publish a Consumer Confidence Report?: Yes. CLARENDON HILLS 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 CLARENDON HILLS’s next Consumer Confidence Report due?: CLARENDON HILLS’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does CLARENDON HILLS have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for CLARENDON HILLS.
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

MCLAUGHLIN, BRENDAN

630-286-4750

CLARENDON HILLS, IL 60514