Public Water Partners

LAKE IN THE HILLS, IL · McHenry County

LAKE IN THE HILLS Water System

Consumer Confidence Report status

LAKE IN THE 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 LAKE IN THE 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)
IL1110400
System type
Community Water System
Population served
28,661
Service connections
9,590
Ownership
local government
Water source
groundwater (wells)

LAKE IN THE HILLS is one of 225 community water systems in Illinois in the 10,001 to 100,000 people size category, serving 28,661 people from groundwater.

As of August 1, 2026, its federal record holds 9 entries between 1977 and 2025, all of which EPA lists as closed.

Of the 9, 6 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 Stage 2 Disinfectants and Disinfection Byproducts Rule, and the Radionuclides and Revised Rad Rule.

Violation history

  • Monitoring and Reporting (DBP)

    —

    Total Haloacetic Acids (HAA5)

    January 1, 2025 – December 31, 2025

    Archived

  • Monitoring and Reporting (DBP)

    —

    TTHM

    January 1, 2025 – December 31, 2025

    Archived

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    August 1, 2012 – August 31, 2012

    Resolved

  • Consumer Confidence Report Inadequate Reporting

    —

    Consumer Confidence Rule

    July 1, 2012 – July 8, 2013

    Resolved

  • Monitoring, Regular

    —

    Nitrate

    January 1, 2006 – December 31, 2006

    Resolved

  • Monitoring, Regular

    —

    Nitrate

    January 1, 1999 – March 31, 1999

    Resolved

  • Monitoring, Regular

    —

    Barium

    January 1, 1999 – March 31, 1999

    Resolved

  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    September 14, 1984 – July 1, 1986

    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

Enforcement actions

Common questions

Is LAKE IN THE HILLS required to publish a Consumer Confidence Report?

Yes. LAKE IN THE 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 LAKE IN THE HILLS’s next Consumer Confidence Report due?

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

Does LAKE IN THE HILLS have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for LAKE IN THE 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

RIVERA, KEVIN

847-960-7520

LAKE IN THE HILLS, IL 60156