CAHOKIA, IL · St. Clair County

CAHOKIA Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of August 6, 2021. 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 St. Clair 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): IL1630200
System type: Community Water System
Population served: 4,150
Service connections: 1,570
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

CAHOKIA is one of 248 community water systems in Illinois in the 3,301 to 10,000 people size category, formerly serving 4,150 people from surface water.

EPA's federal records list this system as inactive in 2021; the record below is historical.

As of August 1, 2026, its federal record holds 9 entries between 1997 and 2020, all of which EPA lists as closed. Nothing has been added since 2020.

Of the 9, 6 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 the Consumer Confidence Rule, the Total Coliform Rules, and the Stage 1 Disinfectants and Disinfection Byproducts Rule.

Violation history

Lead Consumer Notice
—
Lead and Copper Rule
December 30, 2020 – January 28, 2021
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
July 1, 2017 – June 21, 2018
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
July 1, 2016 – September 13, 2016
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
May 1, 2016 – May 31, 2016
Resolved
Monitoring and Reporting (DBP)
—
Chloramine
April 1, 2016 – June 24, 2016
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
February 1, 2016 – February 29, 2016
Resolved
Monitoring and Reporting (DBP)
—
Chloramine
January 1, 2016 – March 29, 2016
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2003 – July 11, 2003
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
July 1, 1997 – July 31, 1997
Archived

Resolved 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
December 30, 2020 – January 28, 2021	Lead Consumer Notice	Lead and Copper Rule	—	Resolved
July 1, 2017 – June 21, 2018	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
July 1, 2016 – September 13, 2016	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
May 1, 2016 – May 31, 2016	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
April 1, 2016 – June 24, 2016	Monitoring and Reporting (DBP)	Chloramine	—	Resolved
February 1, 2016 – February 29, 2016	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
January 1, 2016 – March 29, 2016	Monitoring and Reporting (DBP)	Chloramine	—	Resolved
July 1, 2003 – July 11, 2003	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 1997 – July 31, 1997	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived

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

Enforcement actions

January 28, 2021State Compliance achieved1 linked violation
January 6, 2021State Violation/Reminder Notice1 linked violation
June 21, 2018State Compliance achieved1 linked violation
August 25, 2017State Violation/Reminder Notice1 linked violation
February 15, 2017State Public Notification received1 linked violation
February 15, 2017State Public Notification received1 linked violation
September 13, 2016State Compliance achieved1 linked violation
August 11, 2016State Violation/Reminder Notice1 linked violation
June 24, 2016State Compliance achieved2 linked violations
June 13, 2016State Violation/Reminder Notice1 linked violation
June 13, 2016State Public Notification requested1 linked violation
June 13, 2016State Violation/Reminder Notice1 linked violation
June 13, 2016State Public Notification requested1 linked violation
April 4, 2016State Public Notification received1 linked violation
April 4, 2016State Public Notification received4 linked violations
March 29, 2016State Compliance achieved2 linked violations
March 14, 2016State Public Notification requested1 linked violation
March 14, 2016State Violation/Reminder Notice1 linked violation
March 14, 2016State Public Notification requested1 linked violation
March 14, 2016State Violation/Reminder Notice1 linked violation
July 11, 2003State Compliance achieved2 linked violations
October 5, 1997State Public Notification requested1 linked violation
October 5, 1997State Violation/Reminder Notice1 linked violation
September 17, 1997State Public Notification received1 linked violation
September 15, 1991State Public Notification requested1 linked violation
June 23, 1989State Public Notification received1 linked violation
June 17, 1989State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record

Last known contact on file (system is inactive)

BRANSON, LYNN

618-337-2149

CAHOKIA, IL 62206