Is S L M WATER COMMISSION required to publish a Consumer Confidence Report?

Yes. S L M WATER COMMISSION is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is S L M WATER COMMISSION’s next Consumer Confidence Report due?

S L M WATER COMMISSION’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

MASCOUTAH, IL · St. Clair County

S L M WATER COMMISSION Water System

Consumer Confidence Report status

S L M WATER COMMISSION must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for S L M WATER COMMISSION.

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): IL1635090
System type: Community Water System
Population served: 385
Service connections: 154
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

S L M WATER COMMISSION is one of 1,572 community water systems in Illinois in the 500 or fewer people size category, serving 385 people from surface water.

As of August 1, 2026, its federal record holds 6 entries between 1977 and 2025, all of which EPA lists as closed.

Of the 6, 5 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 synthetic organic chemicals, the Surface Water Treatment Rules, and the Total Coliform Rules.

Violation history

Monitoring, Regular
—
Simazine
July 1, 2025 – September 30, 2025
Resolved
Monitoring, Regular
—
Atrazine
July 1, 2025 – September 30, 2025
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Long Term 2 Enhanced Surface Water Treatment Rule
June 1, 2014 – June 30, 2014
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 2006 – August 31, 2006
Resolved
Monitoring and Reporting (DBP)
—
Chloramine
July 1, 2006 – September 30, 2006
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
June 30, 1977 – June 29, 1981
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
July 1, 2025 – September 30, 2025	Monitoring, Regular	Simazine	—	Resolved
July 1, 2025 – September 30, 2025	Monitoring, Regular	Atrazine	—	Resolved
June 1, 2014 – June 30, 2014	Treatment Technique (SWTR and GWR)	Long Term 2 Enhanced Surface Water Treatment Rule	Health-based	Resolved
August 1, 2006 – August 31, 2006	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2006 – September 30, 2006	Monitoring and Reporting (DBP)	Chloramine	—	Resolved
June 30, 1977 – June 29, 1981	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

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

Enforcement actions

December 17, 2025State Violation/Reminder Notice6 linked violations
December 17, 2025State Violation/Reminder Notice7 linked violations
July 29, 2014State Public Notification requested28 linked violations
June 5, 1995State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
June 5, 1995State Public Notification requestedgeneral compliance action — not tied to a specific violation on record

Common questions

Is S L M WATER COMMISSION required to publish a Consumer Confidence Report?: Yes. S L M WATER COMMISSION is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is S L M WATER COMMISSION’s next Consumer Confidence Report due?: S L M WATER COMMISSION’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does S L M WATER COMMISSION have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for S L M WATER COMMISSION.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

MUELLER, DON L.

618-566-7100

MASCOUTAH, IL 62258