DARIEN, IL · DuPage County

YORK TOWNSHIP WATER SYSTEM Water System

Current status

1 item on record is open and awaiting resolution as of July 4, 2026. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings. Full details are in the violation history below.

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): IL0430010
System type: Community Water System
Population served: 1,423
Service connections: 480
Ownership: privately owned
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
July 1, 2025
Unaddressed
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
October 1, 2012 – September 11, 2013
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
October 2, 2011 – October 11, 2011
Resolved
Lead Consumer Notice
—
Lead and Copper Rule
April 2, 2011 – October 11, 2011
Resolved
Monitoring, Regular
—
Nitrate
January 1, 2011 – December 31, 2011
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 6, 2010 – December 23, 2010
Resolved
OCCT/SOWT Treatment Installation/Demonstration
Health-based
Lead and Copper Rule
August 22, 2009 – June 30, 2011
Resolved
Public Notification Violation without NPDWR Violation
—
Public Notice
January 19, 2008 – February 15, 2008
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
January 19, 2008 – February 15, 2008
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
November 1, 2007 – November 30, 2007
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
February 1, 2006 – February 28, 2006
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
May 1, 2002 – May 31, 2002
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
March 1, 2000 – March 31, 2000
Archived
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
October 19, 1999 – January 31, 2000
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 1999 – September 30, 1999
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
May 1, 1998 – May 31, 1998
Archived
Monitoring, Regular
—
Dalapon
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Diquat
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Endothall
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
OXAMYL
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Simazine
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Picloram
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Aldicarb sulfoxide
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Aldicarb
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
BHC-GAMMA
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Methoxychlor
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Toxaphene
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Atrazine
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
LASSO
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Heptachlor
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Heptachlor epoxide
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
2,4-D
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
2,4,5-TP
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Pentachlorophenol
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
ETHYLENE DIBROMIDE
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Chlordane
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Regular
—
Endrin
October 1, 1994 – December 31, 1994
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 1994 – September 30, 1994
Archived
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
October 1, 1993 – December 31, 1994
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
October 1, 1992 – October 31, 1992
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 1992 – September 30, 1992
Archived
Monitoring, Repeat Minor (TCR)
—
Coliform (TCR)
September 1, 1992 – September 30, 1992
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)

Period	Violation	Contaminant / rule	Health-based	Status
July 1, 2025	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Unaddressed
October 1, 2012 – September 11, 2013	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
October 2, 2011 – October 11, 2011	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
April 2, 2011 – October 11, 2011	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
January 1, 2011 – December 31, 2011	Monitoring, Regular	Nitrate	—	Resolved
October 6, 2010 – December 23, 2010	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
August 22, 2009 – June 30, 2011	OCCT/SOWT Treatment Installation/Demonstration	Lead and Copper Rule	Health-based	Resolved
January 19, 2008 – February 15, 2008	Public Notification Violation without NPDWR Violation	Public Notice	—	Resolved
January 19, 2008 – February 15, 2008	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
November 1, 2007 – November 30, 2007	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
February 1, 2006 – February 28, 2006	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
May 1, 2002 – May 31, 2002	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
March 1, 2000 – March 31, 2000	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
October 19, 1999 – January 31, 2000	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
September 1, 1999 – September 30, 1999	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
May 1, 1998 – May 31, 1998	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
October 1, 1994 – December 31, 1994	Monitoring, Regular	Dalapon	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Diquat	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Endothall	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	OXAMYL	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Simazine	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Picloram	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Aldicarb sulfoxide	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Aldicarb	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	BHC-GAMMA	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Methoxychlor	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Toxaphene	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Atrazine	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	LASSO	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Heptachlor	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Heptachlor epoxide	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	2,4-D	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	2,4,5-TP	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Pentachlorophenol	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Total Polychlorinated Biphenyls (PCB)	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Chlordane	—	Resolved
October 1, 1994 – December 31, 1994	Monitoring, Regular	Endrin	—	Resolved
September 1, 1994 – September 30, 1994	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
October 1, 1993 – December 31, 1994	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Resolved
October 1, 1992 – October 31, 1992	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
September 1, 1992 – September 30, 1992	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
September 1, 1992 – September 30, 1992	Monitoring, Repeat Minor (TCR)	Coliform (TCR)	—	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

September 20, 2025State Violation/Reminder Notice1 linked violation
September 11, 2013State Compliance achieved1 linked violation
June 26, 2013State Public Notification received1 linked violation
October 11, 2012State Public Notification requested1 linked violation
October 11, 2012State Violation/Reminder Notice1 linked violation
July 2, 2012State Public Notification received1 linked violation
February 8, 2012State Compliance achieved1 linked violation
January 12, 2012State Public Notification requested1 linked violation
January 12, 2012State Violation/Reminder Notice1 linked violation
October 11, 2011State Compliance achieved2 linked violations
October 4, 2011State Violation/Reminder Notice1 linked violation
June 30, 2011State Compliance achieved1 linked violation
January 7, 2011State Bilateral Compliance Agreement signed1 linked violation
December 23, 2010State Compliance achieved1 linked violation
December 21, 2010State Formal Notice of Violation issued1 linked violation
October 6, 2010State Violation/Reminder Notice1 linked violation
February 18, 2010State Bilateral Compliance Agreement signed1 linked violation
November 2, 2009State Formal Notice of Violation issued1 linked violation
October 9, 2009State Public Notification received1 linked violation
September 9, 2009State Violation/Reminder Notice1 linked violation
September 9, 2009State Public Notification requested1 linked violation
June 1, 2008State Compliance achieved1 linked violation
February 15, 2008State Compliance achieved2 linked violations
February 15, 2008State Public Notification received1 linked violation
February 13, 2008State Violation/Reminder Notice2 linked violations
December 19, 2007State Public Notification requested1 linked violation
December 19, 2007State Violation/Reminder Notice3 linked violations
September 1, 2006State Compliance achieved2 linked violations
May 3, 2006State Public Notification received3 linked violations
March 28, 2000State Bilateral Compliance Agreement signed1 linked violation
February 7, 2000State Formal Notice of Violation issued1 linked violation
November 15, 1999State Violation/Reminder Notice1 linked violation
November 15, 1999State Public Notification requested1 linked violation
July 15, 1998State Public Notification requested1 linked violation
July 15, 1998State Violation/Reminder Notice1 linked violation
August 26, 1995State Violation/Reminder Notice1 linked violation
August 26, 1995State Public Notification requested1 linked violation
March 16, 1995State Public Notification requested31 linked violations
March 16, 1995State Violation/Reminder Notice31 linked violations
February 23, 1995State Compliance achieved31 linked violations
December 31, 1994State Compliance achieved2 linked violations
November 26, 1994State Public Notification requested1 linked violation
November 26, 1994State Violation/Reminder Notice1 linked violation
October 22, 1994State Public Notification requested1 linked violation
October 22, 1994State Violation/Reminder Notice1 linked violation
September 25, 1994State Public Notification requested2 linked violations
September 25, 1994State Public Notification requested1 linked violation
September 25, 1994State Violation/Reminder Notice1 linked violation
September 25, 1994State Violation/Reminder Notice2 linked violations
January 1, 1994State Public Notification requested2 linked violations
January 1, 1994State Violation/Reminder Notice1 linked violation
January 1, 1994State Public Notification requested1 linked violation
December 4, 1993State Public Notification requested2 linked violations
December 4, 1993State Violation/Reminder Notice2 linked violations
December 4, 1993State Public Notification requested1 linked violation
December 4, 1993State Violation/Reminder Notice1 linked violation
April 1, 1993State Public Notification requested1 linked violation
April 1, 1993State Violation/Reminder Notice1 linked violation
December 5, 1992State Public Notification requested1 linked violation
December 5, 1992State Violation/Reminder Notice1 linked violation
October 31, 1992State Violation/Reminder Notice2 linked violations
October 31, 1992State Public Notification requested2 linked violations
September 30, 1992State Public Notification received1 linked violation
September 5, 1992State Violation/Reminder Notice1 linked violation
September 5, 1992State Public Notification requested1 linked violation

Contact

ADAMS, JONATHAN

630-964-7503

DARIEN, IL 60561