Public water system · IL1635090
ActiveS L M Water Commission
At a glance
S L M Water Commission (PWSID IL1635090) is an active community water system in St. Clair County, Illinois. It reports serving 385 people through 154 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
385
Service connections
154
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does S L M Water Commission compare with other water systems in St. Clair County?
By EPA's size categories, S L M Water Commission is a very small system (500 people or fewer). St. Clair County has 42 active public water systems. Its population served is well below the county average of 6,082 people per system, and accounts for 0.2% of the 255,459 people reported by systems filed under the county. Across Illinois, the 3,872 active systems average 3,204 people each. Nationally, the average active community water system reports serving 6,703 people, so S L M Water Commission is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Illinois has 1,773 active community water systems, 46% of the state's 3,872 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 89 Illinois systems (2.3%) list surface water as their primary source.
Who owns and regulates S L M Water Commission?
EPA lists S L M Water Commission as owned by a local government. The IL state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 22 of the 42 active systems in St. Clair County (52%) are also owned by a local government.
Does S L M Water Commission have drinking water violations?
EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 2025. The violations listed here began between June 1977 and July 2025. By type: 5 monitoring and reporting, 1 required treatment not met and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Atrazine (2 of them). EPA lists 6 as resolved and 1 as archived. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2025-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Atrazinecode 2050 | No | Resolved |
| 2025-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Simazinecode 2037 | No | Resolved |
| 2014-06-01 | Required treatment not metTreatment Technique (SWTR and GWR) · code 41 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2006-08-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2006-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chloraminecode 1006 | No | Resolved |
| 1995-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Atrazinecode 2050 | Yes | Resolved |
| 1977-06-30 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Archived |
All 7 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
S L M Water Commission: frequently asked questions
Who runs S L M Water Commission?
S L M Water Commission (PWSID IL1635090) is a community water system owned by a local government. It is regulated by the IL state drinking water program.
How many people does S L M Water Commission serve?
S L M Water Commission reports serving 385 people through 154 service connections in St. Clair County, Illinois.
Where does S L M Water Commission get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does S L M Water Commission have any drinking water violations?
EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 2025. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is S L M Water Commission's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 7 violations for this system; 2 are health-based, and the most recent began in July 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the IL state drinking water program.
Where can I find S L M Water Commission's water quality report?
As a community water system, S L M Water Commission must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in St. Clair County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Il American-East St Louis | St. Clair | 131,368 | Community | Surface water |
| O Fallon | St. Clair | 46,603 | Community | Purchased surface water |
| Caseyville | St. Clair | 13,798 | Community | Purchased surface water |
| Cahokia Heights | St. Clair | 12,528 | Community | Purchased surface water |
| Mascoutah | St. Clair | 8,759 | Community | Purchased surface water |
| American Water Oper and Maintenance, LLC | St. Clair | 6,779 | Community | Purchased surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “S L M Water Commission, PWSID IL1635090, Illinois”, https://aquacensus.com/water-systems/illinois/s-l-m-water-commission-il1635090 (data as of October 1, 2026).