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OSWEGO

Illinois — Community Water System — PWSID: IL0930150

System Information

PWSIDIL0930150
System NameOSWEGO
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region05
Serves SchoolNo
WholesalerNo
First ReportedFeb 13, 1981
Last ReportedDec 4, 2025

Location & Contact

StateIllinois
CityOSWEGO
ZIP Code60543
Address100 Parkers Mill
OrganizationCASSIDY, CURTIS
Phone630-551-2189

Population & Service

Population Served38,169
Service Connections12,887

Drinking Water Violations (272)

This water system has 272 violations recorded in the EPA SDWIS database.

Begin Date End Date Contaminant Category Health-Based Major Measured Federal MCL State MCL Status Return to Compliance Rule
Sep 1, 2024 Sep 30, 2024 Chlorine MR No No — 4.0 mg/L — Resolved Sep 30, 2024 Stage 1 Disinfectants and Disinfection Byproducts Rule
Sep 1, 2024 Sep 30, 2024 Chlorine MR No No — 4.0 mg/L — Resolved Sep 30, 2024 Stage 1 Disinfectants and Disinfection Byproducts Rule
Sep 1, 2024 Sep 30, 2024 Chlorine MR No No — 4.0 mg/L — Resolved Sep 30, 2024 Stage 1 Disinfectants and Disinfection Byproducts Rule
Sep 1, 2024 Sep 30, 2024 Chlorine MR No No — 4.0 mg/L — Resolved Sep 30, 2024 Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2022 — Consumer Confidence Rule Other No No — — — Resolved Jun 9, 2023 Consumer Confidence Rule
Jul 1, 2022 — Consumer Confidence Rule Other No No — — — Resolved Jun 9, 2023 Consumer Confidence Rule
Jul 1, 2017 — Consumer Confidence Rule Other No No — — — Resolved Jun 25, 2018 Consumer Confidence Rule
Jul 1, 2017 — Consumer Confidence Rule Other No No — — — Resolved Jun 25, 2018 Consumer Confidence Rule
May 14, 2017 — Public Notice Other No No — — — Resolved May 15, 2017 Public Notice Rule and Revised PN Rule
May 14, 2017 — Public Notice Other No No — — — Resolved May 15, 2017 Public Notice Rule and Revised PN Rule
Jan 1, 2017 Mar 31, 2017 Combined Radium (-226 and -228) MCL Yes No 6 PCI/L 5 pCi/L 5 Resolved Mar 31, 2017 Radionuclides and Revised Rad Rule
Jan 1, 2017 Mar 31, 2017 Combined Radium (-226 and -228) MCL Yes No 6 PCI/L 5 pCi/L 5 Resolved Mar 31, 2017 Radionuclides and Revised Rad Rule
Jan 1, 2017 Mar 31, 2017 Combined Radium (-226 and -228) MCL Yes No 6 PCI/L 5 pCi/L 5 Resolved Mar 31, 2017 Radionuclides and Revised Rad Rule
Jan 1, 2017 Mar 31, 2017 Combined Radium (-226 and -228) MCL Yes No 6 PCI/L 5 pCi/L 5 Resolved Mar 31, 2017 Radionuclides and Revised Rad Rule
Jan 1, 2017 Mar 31, 2017 Combined Radium (-226 and -228) MCL Yes No 6 PCI/L 5 pCi/L 5 Resolved Mar 31, 2017 Radionuclides and Revised Rad Rule
Jan 1, 2017 Mar 31, 2017 Combined Radium (-226 and -228) MCL Yes No 6 PCI/L 5 pCi/L 5 Resolved Mar 31, 2017 Radionuclides and Revised Rad Rule
Jul 1, 2016 Sep 30, 2016 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Sep 30, 2016 Radionuclides and Revised Rad Rule
Jul 1, 2016 Sep 30, 2016 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Sep 30, 2016 Radionuclides and Revised Rad Rule
Jul 1, 2016 Sep 30, 2016 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Sep 30, 2016 Radionuclides and Revised Rad Rule
Jul 1, 2016 Sep 30, 2016 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Sep 30, 2016 Radionuclides and Revised Rad Rule
Apr 1, 2014 Jun 30, 2014 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Jun 30, 2014 Radionuclides and Revised Rad Rule
Apr 1, 2014 Jun 30, 2014 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Jun 30, 2014 Radionuclides and Revised Rad Rule
Apr 1, 2014 Jun 30, 2014 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Jun 30, 2014 Radionuclides and Revised Rad Rule
Apr 1, 2014 Jun 30, 2014 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Jun 30, 2014 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Apr 1, 2010 Jun 30, 2010 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Jun 30, 2010 Radionuclides and Revised Rad Rule
Jan 1, 2007 Mar 31, 2007 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Mar 31, 2007 Radionuclides and Revised Rad Rule
Jan 1, 2007 Mar 31, 2007 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Mar 31, 2007 Radionuclides and Revised Rad Rule
Jul 1, 2006 Sep 30, 2006 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Aug 14, 2006 Radionuclides and Revised Rad Rule
Jul 1, 2006 Sep 30, 2006 Combined Radium (-226 and -228) MR No Yes — 5 pCi/L — Resolved Aug 14, 2006 Radionuclides and Revised Rad Rule
Apr 1, 2006 Jun 30, 2006 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved May 23, 2006 Radionuclides and Revised Rad Rule
Apr 1, 2006 Jun 30, 2006 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved May 23, 2006 Radionuclides and Revised Rad Rule
Apr 1, 2006 Jun 30, 2006 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved May 23, 2006 Radionuclides and Revised Rad Rule
Apr 1, 2006 Jun 30, 2006 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved May 23, 2006 Radionuclides and Revised Rad Rule
Jan 1, 2006 Mar 31, 2006 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved Mar 31, 2006 Radionuclides and Revised Rad Rule
Jan 1, 2006 Mar 31, 2006 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved Mar 31, 2006 Radionuclides and Revised Rad Rule
Jan 1, 2006 Mar 31, 2006 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved Mar 31, 2006 Radionuclides and Revised Rad Rule
Jan 1, 2006 Mar 31, 2006 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved Mar 31, 2006 Radionuclides and Revised Rad Rule
Jan 1, 2006 Mar 31, 2006 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved Mar 31, 2006 Radionuclides and Revised Rad Rule
Jan 1, 2006 Mar 31, 2006 Combined Radium (-226 and -228) MCL Yes No 7 PCI/L 5 pCi/L — Resolved Mar 31, 2006 Radionuclides and Revised Rad Rule
Oct 1, 2005 Dec 31, 2005 Combined Radium (-226 and -228) MCL Yes No 7.225 5 pCi/L — Resolved Dec 31, 2005 Radionuclides and Revised Rad Rule
Oct 1, 2005 Dec 31, 2005 Combined Radium (-226 and -228) MCL Yes No 7.225 5 pCi/L — Resolved Dec 31, 2005 Radionuclides and Revised Rad Rule
Oct 1, 2005 Dec 31, 2005 Combined Radium (-226 and -228) MCL Yes No 7.225 5 pCi/L — Resolved Dec 31, 2005 Radionuclides and Revised Rad Rule
Oct 1, 2005 Dec 31, 2005 Combined Radium (-226 and -228) MCL Yes No 7.225 5 pCi/L — Resolved Dec 31, 2005 Radionuclides and Revised Rad Rule
Oct 1, 2005 Dec 31, 2005 Combined Radium (-226 and -228) MCL Yes No 7.225 5 pCi/L — Resolved Dec 31, 2005 Radionuclides and Revised Rad Rule
Oct 1, 2005 Dec 31, 2005 Combined Radium (-226 and -228) MCL Yes No 7.225 5 pCi/L — Resolved Dec 31, 2005 Radionuclides and Revised Rad Rule
Jul 1, 2005 Sep 30, 2005 Combined Radium (-226 and -228) MCL Yes No 9.1 5 pCi/L — Resolved Sep 30, 2005 Radionuclides and Revised Rad Rule
Jul 1, 2005 Sep 30, 2005 Combined Radium (-226 and -228) MCL Yes No 9.1 5 pCi/L — Resolved Sep 30, 2005 Radionuclides and Revised Rad Rule

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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