Drinking Water Compliance OS

LAKE FOREST, IL · Lake County

ELM OAK MUTUAL WATER SYSTEM Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 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)
IL0975736
System type
Community Water System
Population served
50
Service connections
20
Ownership
privately owned
Water source
groundwater (wells)

Violation history

  • Public Notification Violation for NPDWR Violation

    Public Notice

    February 11, 2024 – July 29, 2025

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    February 11, 2024 – July 29, 2025

    Resolved
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    January 1, 2020 – December 31, 2022

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    November 15, 2019 – December 18, 2019

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2019 – December 31, 2019

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 17, 2019 – August 19, 2019

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 17, 2019 – August 19, 2019

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2019 – September 30, 2019

    Resolved
  • Monitoring, Regular

    Combined Uranium

    April 1, 2019 – June 30, 2019

    Resolved
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    April 1, 2019 – June 30, 2019

    Resolved
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    January 1, 2019 – June 30, 2019

    Resolved
  • Monitoring, Routine (RTCR)

    Revised Total Coliform Rule

    June 1, 2018 – June 30, 2018

    Resolved
  • Monitoring and Reporting (DBP)

    Chlorine

    April 1, 2018 – June 30, 2018

    Resolved
  • Consumer Confidence Report Inadequate Reporting

    Consumer Confidence Rule

    July 1, 2012 – June 17, 2013

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2011 – September 30, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    April 1, 2011 – June 30, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2011 – March 31, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2010 – December 31, 2010

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2010 – September 30, 2010

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    April 1, 2010 – June 30, 2010

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2010 – March 31, 2010

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    October 1, 2009 – December 31, 2009

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2009 – December 31, 2009

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    July 1, 2009 – September 30, 2009

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2009 – September 30, 2009

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    April 1, 2009 – June 30, 2009

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    April 1, 2009 – June 30, 2009

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    January 1, 2009 – March 31, 2009

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2009 – March 31, 2009

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2008 – December 31, 2008

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 16, 2008 – July 31, 2008

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2008 – September 30, 2008

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    April 1, 2008 – June 30, 2008

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2008 – March 31, 2008

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2007 – December 31, 2007

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2007 – September 30, 2007

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    April 1, 2007 – June 30, 2007

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2007 – March 31, 2007

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2006 – December 31, 2006

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 30, 2006 – August 31, 2006

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    July 30, 2006 – August 31, 2006

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2006 – September 30, 2006

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    April 1, 2006 – June 30, 2006

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2006 – March 31, 2006

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2005 – December 31, 2005

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2005 – September 30, 2005

    Resolved
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    April 1, 2005 – June 30, 2005

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2005 – March 31, 2005

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2004 – December 31, 2004

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2004 – September 30, 2004

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    April 1, 2004 – June 30, 2004

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2004 – March 31, 2004

    Resolved
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    October 1, 2003 – December 31, 2003

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2003 – December 31, 2003

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2003 – September 30, 2003

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    April 1, 2003 – June 30, 2003

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2003 – March 31, 2003

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2002 – December 31, 2002

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    March 26, 2002 – September 30, 2002

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    January 1, 2000 – April 10, 2001

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    November 1, 1999 – September 30, 2002

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    November 1, 1995 – October 31, 1999

    Archived
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    June 1, 1992 – August 31, 1992

    Resolved
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    June 1, 1992 – August 31, 1992

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    May 1, 1992 – May 31, 1992

    Archived
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    September 1, 1991 – November 30, 1991

    Resolved
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    September 1, 1991 – November 30, 1991

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    July 1, 1991 – July 31, 1991

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    June 4, 1991 – December 1, 1992

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    May 1, 1991 – May 31, 1991

    Archived

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

Enforcement actions

Contact

LACKO, ANTHONY A.

847-362-8646

LAKE FOREST, IL 60046