Drinking Water Compliance OS

NEPONSET, IL · Bureau County

NEPONSET Water System

Current status

1 open health-based violation on record as of July 4, 2026, alongside 6 other open item(s). See the violation history below for contaminant and status details.

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)
IL0110700
System type
Community Water System
Population served
450
Service connections
185
Ownership
local government
Water source
groundwater (wells)

Violation history

  • Public Notification Violation for NPDWR Violation

    Public Notice

    August 22, 2025

    Unaddressed
  • Notification, Known or Potential LSL

    LEAD AND COPPER RULE REVISIONS

    July 2, 2025

    Unaddressed
  • 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

    Unaddressed
  • LSL Inventory

    Health-based

    LEAD AND COPPER RULE REVISIONS

    October 17, 2024

    Unaddressed
  • Consumer Confidence Report Inadequate Reporting

    Consumer Confidence Rule

    July 1, 2023 – June 18, 2024

    Resolved
  • Lead Consumer Notice

    Lead and Copper Rule

    December 30, 2021 – February 11, 2022

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2017 – July 28, 2017

    Resolved
  • Monitoring, Repeat Minor (TCR)

    Coliform (TCR)

    May 1, 2015 – May 31, 2015

    Resolved
  • Monitoring and Reporting (DBP)

    Chlorine

    April 1, 2015 – June 26, 2015

    Resolved
  • Lead Consumer Notice

    Lead and Copper Rule

    January 2, 2013 – September 16, 2013

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2013 – March 31, 2013

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    October 1, 2012 – December 31, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2012 – December 31, 2012

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 11, 2012 – August 22, 2012

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 11, 2012 – August 22, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    July 1, 2012 – September 30, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2012 – September 30, 2012

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    April 13, 2012 – September 24, 2012

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    April 13, 2012 – September 24, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    April 1, 2012 – June 30, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    April 1, 2012 – June 30, 2012

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    January 18, 2012 – September 24, 2012

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    January 18, 2012 – September 24, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2012 – March 31, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    January 1, 2012 – March 31, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2011 – December 31, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    October 1, 2011 – December 31, 2011

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 19, 2011 – September 24, 2012

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    July 1, 2011 – September 30, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2011 – September 30, 2011

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2011 – August 15, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    April 1, 2011 – June 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

    Gross Alpha, Excl. Radon and U

    January 1, 2011 – March 31, 2011

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2011 – March 31, 2011

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    November 19, 2010

    Addressed
  • Public Notification Violation for NPDWR Violation

    Public Notice

    November 19, 2010

    Addressed
  • 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

    Gross Alpha, Excl. Radon and U

    October 1, 2010 – December 31, 2010

    Resolved
  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    September 1, 2010 – September 30, 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

    Gross Alpha, Excl. Radon and U

    July 1, 2010 – September 30, 2010

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    April 21, 2010 – June 23, 2010

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    April 21, 2010 – June 23, 2010

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    April 1, 2010 – June 30, 2010

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    April 1, 2010 – June 30, 2010

    Resolved
  • Lead Consumer Notice

    Lead and Copper Rule

    January 2, 2010 – May 28, 2010

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    January 1, 2010 – March 31, 2010

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2010 – March 31, 2010

    Resolved
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    January 1, 2010 – March 31, 2010

    Resolved
  • Monitoring, Regular

    Combined Uranium

    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
  • Public Notification Violation without NPDWR Violation

    Public Notice

    July 21, 2009 – September 3, 2009

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 21, 2009 – September 3, 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

    July 1, 2009 – September 30, 2009

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    April 15, 2009 – May 18, 2005

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    April 15, 2009 – May 18, 2005

    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
  • Public Notification Violation without NPDWR Violation

    Public Notice

    January 16, 2009 – May 18, 2005

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    January 16, 2009 – May 18, 2005

    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
  • Public Notification Violation without NPDWR Violation

    Public Notice

    October 12, 2008 – May 18, 2005

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    October 12, 2008 – May 18, 2005

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    October 1, 2008 – December 31, 2008

    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 – May 18, 2005

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    July 16, 2008 – May 18, 2005

    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

    Gross Alpha, Excl. Radon and U

    July 1, 2008 – September 30, 2008

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    April 17, 2008 – May 18, 2005

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    April 17, 2008 – May 18, 2005

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    April 1, 2008 – June 30, 2008

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    April 1, 2008 – June 30, 2008

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    January 17, 2008 – May 18, 2005

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    January 17, 2008 – May 18, 2005

    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

    Gross Alpha, Excl. Radon and U

    January 1, 2008 – March 31, 2008

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    October 17, 2007 – May 18, 2005

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    October 17, 2007 – May 18, 2005

    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

    Gross Alpha, Excl. Radon and U

    October 1, 2007 – December 31, 2007

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    July 24, 2007 – May 18, 2005

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 24, 2007 – May 18, 2005

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2007 – September 30, 2007

    Resolved
  • Monitoring, Regular

    Combined Uranium

    July 1, 2007 – September 30, 2007

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    July 1, 2007 – September 30, 2007

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    April 25, 2007 – May 18, 2005

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    April 25, 2007 – May 18, 2005

    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

    Gross Alpha, Excl. Radon and U

    April 1, 2007 – June 30, 2007

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    February 24, 2007 – May 18, 2005

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    February 24, 2007 – May 18, 2005

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    January 11, 2007 – May 18, 2005

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    January 11, 2007 – May 18, 2005

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    January 1, 2007 – March 31, 2007

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    January 1, 2007 – March 31, 2007

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    October 9, 2006 – May 18, 2005

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    October 9, 2006 – May 18, 2005

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2006 – December 31, 2006

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    October 1, 2006 – December 31, 2006

    Resolved
  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    August 1, 2006 – August 31, 2006

    Resolved
  • Public Notification Violation for NPDWR Violation

    Public Notice

    July 11, 2006 – May 18, 2005

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    July 11, 2006 – May 18, 2005

    Resolved
  • Consumer Confidence Report Complete Failure to Report

    Consumer Confidence Rule

    July 1, 2006 – December 5, 2007

    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)

    October 1, 2005 – December 31, 2005

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    August 12, 2005 – May 18, 2005

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 2005 – September 30, 2005

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    April 8, 2005 – May 18, 2005

    Resolved
  • Public Notification Violation without NPDWR Violation

    Public Notice

    January 18, 2005 – May 18, 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
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    April 1, 2004 – June 30, 2004

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    April 1, 2004 – June 30, 2004

    Resolved
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    April 1, 2004 – June 30, 2004

    Resolved
  • Monitoring, Regular

    Combined Uranium

    April 1, 2004 – June 30, 2004

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    October 1, 2003 – December 31, 2003

    Resolved
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    April 1, 2002 – June 30, 2002

    Resolved
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    October 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Combined Radium (-226 and -228)

    October 1, 2001 – December 31, 2001

    Resolved
  • Monitoring, Regular

    Gross Alpha, Excl. Radon and U

    April 1, 2001 – June 30, 2001

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    September 26, 2000 – September 30, 2002

    Resolved
  • Monitoring, Regular

    Fluoride

    July 1, 1999 – September 30, 1999

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    May 1, 1998 – May 20, 1999

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 1, 1994 – December 5, 1997

    Resolved
  • Maximum Contaminant Level Violation, Average

    Health-based

    Gross Alpha, Excl. Radon and U

    May 13, 1994 – May 12, 1998

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    December 1, 1993 – December 31, 1993

    Archived
  • Monitoring, Regular

    Trichloroethylene

    January 1, 1993 – March 31, 1993

    Resolved
  • Monitoring, Regular

    1,2-Dichloropropane

    January 1, 1993 – March 31, 1993

    Resolved
  • Monitoring, Regular

    1,1-Dichloroethylene

    July 1, 1992 – September 30, 1992

    Resolved
  • Monitoring, Regular

    Xylenes, Total

    July 1, 1992 – September 30, 1992

    Resolved
  • Monitoring, Regular

    Styrene

    July 1, 1992 – September 30, 1992

    Resolved
  • Monitoring, Regular

    Ethylbenzene

    July 1, 1992 – September 30, 1992

    Resolved
  • Monitoring, Regular

    Tetrachloroethylene

    July 1, 1992 – September 30, 1992

    Resolved
  • Monitoring, Regular

    1,2-Dichloropropane

    July 1, 1992 – September 30, 1992

    Resolved
  • Monitoring, Regular

    trans-1,2-Dichloroethylene

    July 1, 1992 – September 30, 1992

    Resolved
  • Monitoring, Regular

    p-Dichlorobenzene

    July 1, 1992 – September 30, 1992

    Resolved
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    May 1, 1992 – May 31, 1992

    Archived
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    March 1, 1992 – March 31, 1992

    Archived
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    February 1, 1992 – February 29, 1992

    Archived
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    November 1, 1991 – November 30, 1991

    Archived
  • Maximum Contaminant Level Violation, Acute (TCR)

    Health-based

    Coliform (TCR)

    August 1, 1991 – August 31, 1991

    Archived
  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    August 1, 1991 – August 31, 1991

    Archived
  • Monitoring, Routine Major (TCR)

    Coliform (TCR)

    March 1, 1991 – March 31, 1991

    Archived
  • Maximum Contaminant Level Violation, Average

    Health-based

    Combined Radium (-226 and -228)

    July 20, 1990 – July 19, 1994

    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 stateAddressed corrective action reported, pending final confirmationArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

Contact

CHAPMAN, MARKUS J.

309-525-5595

NEPONSET, IL 61345