Is MOUNT PROSPECT required to publish a Consumer Confidence Report?

Yes. MOUNT PROSPECT 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 MOUNT PROSPECT’s next Consumer Confidence Report due?

MOUNT PROSPECT’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.

MOUNT PROSPECT, IL · Cook County

MOUNT PROSPECT Water System

Consumer Confidence Report status

MOUNT PROSPECT 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 1 item for MOUNT PROSPECT that is open and awaiting resolution. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings.

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): IL0311980
System type: Community Water System
Population served: 41,000
Service connections: 11,590
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

MOUNT PROSPECT is one of 225 community water systems in Illinois in the 10,001 to 100,000 people size category, serving 41,000 people from surface water.

As of August 1, 2026, its federal record holds 11 entries between 1977 and 2025, of which 1 remains open; none are health-based.

Of the 11, 7 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 Consumer Confidence Rule, volatile organic chemicals, and the Total Coliform Rules.

Violation history

Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
July 1, 2025
Unaddressed
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2025 – November 4, 2025
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
December 1, 2024 – December 31, 2024
Resolved
Monitoring, Regular
—
Toluene
July 1, 2024 – September 30, 2024
Resolved
Monitoring, Regular
—
Xylenes, Total
July 1, 2024 – September 30, 2024
Resolved
Monitoring, Regular
—
Ethylbenzene
July 1, 2024 – September 30, 2024
Resolved
Monitoring, Regular
—
Benzene
July 1, 2024 – September 30, 2024
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2020 – January 13, 2021
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
July 1, 2017 – July 5, 2018
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
July 1, 2016 – September 15, 2016
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 1, 2025	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Unaddressed
July 1, 2025 – November 4, 2025	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
December 1, 2024 – December 31, 2024	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
July 1, 2024 – September 30, 2024	Monitoring, Regular	Toluene	—	Resolved
July 1, 2024 – September 30, 2024	Monitoring, Regular	Xylenes, Total	—	Resolved
July 1, 2024 – September 30, 2024	Monitoring, Regular	Ethylbenzene	—	Resolved
July 1, 2024 – September 30, 2024	Monitoring, Regular	Benzene	—	Resolved
December 30, 2020 – January 13, 2021	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
July 1, 2017 – July 5, 2018	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
July 1, 2016 – September 15, 2016	Consumer Confidence Report Inadequate Reporting	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

November 4, 2025State Compliance achieved1 linked violation
August 25, 2025State Violation/Reminder Notice1 linked violation
August 25, 2025State Violation/Reminder Notice1 linked violation
June 20, 2025State Public Notification received1 linked violation
June 20, 2025State Public Notification received1 linked violation
June 20, 2025State Public Notification received1 linked violation
June 20, 2025State Public Notification received1 linked violation
June 20, 2025State Public Notification received1 linked violation
January 24, 2025State Violation/Reminder Notice1 linked violation
January 24, 2025State Public Notification requested1 linked violation
January 21, 2025State Compliance achieved1 linked violation
January 13, 2025State Compliance achieved4 linked violations
October 11, 2024State Public Notification requested1 linked violation
October 11, 2024State Violation/Reminder Notice2 linked violations
October 11, 2024State Violation/Reminder Notice1 linked violation
October 11, 2024State Public Notification requested1 linked violation
October 11, 2024State Violation/Reminder Notice1 linked violation
October 11, 2024State Violation/Reminder Notice1 linked violation
October 11, 2024State Public Notification requested1 linked violation
January 13, 2021State Compliance achieved3 linked violations
January 6, 2021State Violation/Reminder Notice1 linked violation
July 5, 2018State Compliance achieved2 linked violations
August 25, 2017State Violation/Reminder Notice1 linked violation
September 15, 2016State Compliance achieved1 linked violation
August 11, 2016State Violation/Reminder Notice2 linked violations
September 25, 1994State Public Notification requestedgeneral compliance action — not tied to a specific violation on record
September 25, 1994State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
December 5, 1992State Violation/Reminder Notice2 linked violations
December 5, 1992State Public Notification requested2 linked violations
January 6, 1990State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
January 6, 1990State Public Notification requestedgeneral compliance action — not tied to a specific violation on record

Common questions

Is MOUNT PROSPECT required to publish a Consumer Confidence Report?: Yes. MOUNT PROSPECT 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 MOUNT PROSPECT’s next Consumer Confidence Report due?: MOUNT PROSPECT’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does MOUNT PROSPECT have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show 1 item for MOUNT PROSPECT that is open and awaiting resolution. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings.
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

DORSEY, SEAN P.

847-870-5640

MOUNT PROSPECT, IL 60056