OTTAWA TWP, IL · LaSalle County

COOKS MHP Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of May 1, 1999. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.

If you are a resident looking for your current water provider, see water systems in LaSalle County, IL.

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): IL0995145
System type: Community Water System
Population served: 25
Service connections: 15
Ownership: privately owned
Water source: groundwater (wells)

COOKS MHP is one of 1,572 community water systems in Illinois in the 500 or fewer people size category, formerly serving 25 people from groundwater.

EPA's federal records list this system as inactive in 1999; the record below is historical.

As of August 1, 2026, its federal record holds 32 entries between 1986 and 1994, all of which EPA lists as closed. Nothing has been added since 1994.

Of the 32, 25 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 volatile organic chemicals, the Total Coliform Rules, and the Radionuclides and Revised Rad Rule.

Violation history

Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
August 1, 1994 – July 31, 1998
Archived
Monitoring, Regular
—
1,1,2-Trichloroethane
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
1,2-Dichloroethane
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
1,1,1-Trichloroethane
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
Carbon tetrachloride
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
1,2-Dichloropropane
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
Trichloroethylene
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
Tetrachloroethylene
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
CHLOROBENZENE
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
Benzene
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
Toluene
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
Styrene
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
1,2,4-Trichlorobenzene
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
cis-1,2-Dichloroethylene
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
Xylenes, Total
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
o-Dichlorobenzene
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
p-Dichlorobenzene
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
July 1, 1994 – June 30, 1995
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
July 1, 1994 – June 30, 1995
Resolved
Public Education
Health-based
Lead and Copper Rule
January 1, 1994 – April 24, 1995
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
August 1, 1993 – August 31, 1993
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 1993 – July 31, 1993
Archived
Monitoring, Repeat Major (TCR)
—
Coliform (TCR)
July 1, 1993 – July 31, 1993
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
April 1, 1993 – April 30, 1993
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
March 1, 1993 – March 31, 1993
Archived
OCCT/SOWT Study/Recommendation
Health-based
Lead and Copper Rule
February 24, 1993 – February 21, 1997
Archived
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
January 1, 1992 – January 31, 1992
Archived
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
July 1, 1991 – July 31, 1991
Archived
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
August 1, 1990 – July 31, 1994
Archived
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
May 18, 1990 – February 8, 1991
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
August 5, 1986 – August 4, 1990
Archived

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

Period	Violation	Contaminant / rule	Health-based	Status
August 1, 1994 – July 31, 1998	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived
July 1, 1994 – June 30, 1995	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	1,2-Dichloroethane	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	1,1,1-Trichloroethane	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	Carbon tetrachloride	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	1,2-Dichloropropane	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	Trichloroethylene	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	Tetrachloroethylene	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	CHLOROBENZENE	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	Benzene	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	Toluene	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	Styrene	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	Xylenes, Total	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	o-Dichlorobenzene	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	p-Dichlorobenzene	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
July 1, 1994 – June 30, 1995	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
January 1, 1994 – April 24, 1995	Public Education	Lead and Copper Rule	Health-based	Resolved
August 1, 1993 – August 31, 1993	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
July 1, 1993 – July 31, 1993	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
July 1, 1993 – July 31, 1993	Monitoring, Repeat Major (TCR)	Coliform (TCR)	—	Archived
April 1, 1993 – April 30, 1993	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
March 1, 1993 – March 31, 1993	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
February 24, 1993 – February 21, 1997	OCCT/SOWT Study/Recommendation	Lead and Copper Rule	Health-based	Archived
January 1, 1992 – January 31, 1992	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
July 1, 1991 – July 31, 1991	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
August 1, 1990 – July 31, 1994	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived
May 18, 1990 – February 8, 1991	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
August 5, 1986 – August 4, 1990	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived

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

Enforcement actions

July 31, 1995State Public Notification received1 linked violation
April 4, 1995State Violation/Reminder Notice20 linked violations
April 4, 1995State Public Notification requested20 linked violations
April 26, 1994State Compliance achieved1 linked violation
January 22, 1994State Public Notification requested1 linked violation
January 22, 1994State Violation/Reminder Notice1 linked violation
December 25, 1993State Public Notification requested3 linked violations
December 25, 1993State Violation/Reminder Notice3 linked violations
December 13, 1993State Public Notification received3 linked violations
September 26, 1993State Public Notification requested1 linked violation
September 26, 1993State Violation/Reminder Notice1 linked violation
August 28, 1993State Violation/Reminder Notice2 linked violations
August 28, 1993State Public Notification requested2 linked violations
June 26, 1993State Violation/Reminder Notice1 linked violation
June 26, 1993State Public Notification requested1 linked violation
May 29, 1993State Public Notification requested1 linked violation
May 29, 1993State Violation/Reminder Notice1 linked violation
May 27, 1993State Public Notification received3 linked violations
April 22, 1993State Violation/Reminder Notice1 linked violation
April 22, 1993State Public Notification requested1 linked violation
August 24, 1992State Public Notification requested1 linked violation
March 12, 1992State Public Notification requested1 linked violation
March 1, 1992State Violation/Reminder Notice1 linked violation
March 1, 1992State Public Notification requested1 linked violation
December 2, 1991State Public Notification issued1 linked violation
November 30, 1991State Violation/Reminder Notice1 linked violation
November 6, 1991State Public Notification received1 linked violation
October 16, 1991State Public Notification requested1 linked violation
August 31, 1991State Public Notification requested1 linked violation
August 1, 1991State Public Notification received1 linked violation
May 1, 1991State Public Notification received1 linked violation
April 24, 1991State Public Notification requested1 linked violation
October 18, 1990State Public Notification received2 linked violations
October 16, 1990State Public Notification requested3 linked violations
June 21, 1990State Public Notification received1 linked violation
June 14, 1990State Public Notification requested2 linked violations
February 19, 1990State Public Notification received1 linked violation
January 16, 1990State Public Notification requested1 linked violation
October 18, 1989State Public Notification received1 linked violation
October 12, 1989State Public Notification requested1 linked violation

Last known contact on file (system is inactive)

Not on record

Phone not on record

OTTAWA TWP, IL 61350