Public Water Partners

WINNETKA, IL · Cook County

WINNETKA Water System

Consumer Confidence Report status

WINNETKA 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 WINNETKA.

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)
IL0313330
System type
Community Water System
Population served
12,475
Service connections
4,477
Ownership
local government
Water source
surface water (rivers, lakes, or reservoirs)

WINNETKA is one of 225 community water systems in Illinois in the 10,001 to 100,000 people size category, serving 12,475 people from surface water.

As of August 1, 2026, its federal record holds 8 entries between 1979 and 2010, all of which EPA lists as closed. Nothing has been added since 2010.

Of the 8, 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 inorganic chemicals, the Consumer Confidence Rule, and the Total Coliform Rules.

Violation history

  • Consumer Confidence Report Complete Failure to Report

    —

    Consumer Confidence Rule

    July 1, 2010 – July 20, 2010

    Resolved

  • Monitoring, Routine Major (TCR)

    —

    Coliform (TCR)

    December 1, 2006 – December 31, 2006

    Resolved

  • Monitoring and Reporting (DBP)

    —

    Chlorine

    October 1, 2006 – December 31, 2006

    Resolved

  • Monitoring, Regular

    —

    Chromium

    June 25, 1979 – June 24, 1980

    Archived

  • Monitoring, Regular

    —

    Arsenic

    June 25, 1979 – June 24, 1980

    Archived

  • Monitoring, Regular

    —

    Fluoride

    June 25, 1979 – June 24, 1980

    Archived

  • Monitoring, Regular

    —

    Barium

    June 25, 1979 – June 24, 1980

    Archived

  • Monitoring, Regular

    —

    Cadmium

    June 25, 1979 – June 24, 1980

    Archived

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

Enforcement actions

No enforcement actions on record for this system.

Common questions

Is WINNETKA required to publish a Consumer Confidence Report?

Yes. WINNETKA 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 WINNETKA’s next Consumer Confidence Report due?

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

Does WINNETKA have any open drinking water violations on record?

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

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

NARHI, NICHOLAS

847-716-3556

WINNETKA, IL 60093