Public Water Partners

DEERFIELD, IL · Lake County

DEERFIELD Water System

Consumer Confidence Report status

DEERFIELD 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 2 items for DEERFIELD that are 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)
IL0974340
System type
Community Water System
Population served
19,196
Service connections
6,281
Ownership
local government
Water source
surface water (rivers, lakes, or reservoirs)

DEERFIELD is one of 225 community water systems in Illinois in the 10,001 to 100,000 people size category, serving 19,196 people from surface water.

As of August 1, 2026, its federal record holds 14 entries between 1977 and 2026, of which 2 remain open; none are health-based.

Of the 14, 5 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, the Lead and Copper Rule, and the Stage 2 Disinfectants and Disinfection Byproducts Rule.

Violation history

  • Follow-up Or Routine LCR Tap M/R

    —

    Lead and Copper Rule

    January 1, 2026

    Unaddressed

  • Consumer Confidence Report Inadequate Reporting

    —

    Consumer Confidence Rule

    July 1, 2025

    Unaddressed

  • Monitoring and Reporting (DBP)

    —

    Total Haloacetic Acids (HAA5)

    January 1, 2025 – March 31, 2025

    Resolved

  • Monitoring and Reporting (DBP)

    —

    TTHM

    January 1, 2025 – March 31, 2025

    Resolved

  • Consumer Confidence Report Inadequate Reporting

    —

    Consumer Confidence Rule

    July 10, 2023 – July 1, 2024

    Resolved

  • Consumer Confidence Report Inadequate Reporting

    —

    Consumer Confidence Rule

    July 1, 2022 – July 1, 2024

    Resolved

  • Consumer Confidence Report Complete Failure to Report

    —

    Consumer Confidence Rule

    July 1, 2019 – July 19, 2019

    Resolved

  • Consumer Confidence Report Inadequate Reporting

    —

    Consumer Confidence Rule

    July 1, 2018 – July 19, 2019

    Resolved

  • Consumer Confidence Report Inadequate Reporting

    —

    Consumer Confidence Rule

    July 1, 2014 – June 29, 2015

    Resolved

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    August 1, 2013 – August 31, 2013

    Resolved

  • Maximum Contaminant Level Violation, Acute (TCR)

    Health-based

    Coliform (TCR)

    August 1, 2013 – August 31, 2013

    Resolved

  • Follow-up Or Routine LCR Tap M/R

    —

    Lead and Copper Rule

    October 1, 2005 – June 14, 2006

    Resolved

  • OCCT/SOWT Study/Recommendation

    Health-based

    Lead and Copper Rule

    December 7, 1992 – December 28, 1993

    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)

Enforcement actions

Common questions

Is DEERFIELD required to publish a Consumer Confidence Report?

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

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

Does DEERFIELD have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show 2 items for DEERFIELD that are 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

PHILLIPS, ROBERT W.

847-317-2490

DEERFIELD, IL 60015