MASCOUTAH, IL · St. Clair County
S L M WATER COMMISSION Water System
Current status
No open violations on record as of July 4, 2026.
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)
- IL1635090
- System type
- Community Water System
- Population served
- 385
- Service connections
- 154
- Ownership
- local government
- Water source
- surface water (rivers, lakes, or reservoirs)
Violation history
Monitoring, Regular
—Simazine
July 1, 2025 – September 30, 2025
ArchivedMonitoring, Regular
—Atrazine
July 1, 2025 – September 30, 2025
ArchivedTreatment Technique (SWTR and GWR)
Health-basedLong Term 2 Enhanced Surface Water Treatment Rule
June 1, 2014 – June 30, 2014
ResolvedMonitoring, Routine Major (TCR)
—Coliform (TCR)
August 1, 2006 – August 31, 2006
ResolvedMonitoring and Reporting (DBP)
—Chloramine
July 1, 2006 – September 30, 2006
ResolvedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
June 30, 1977 – June 29, 1981
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 |
|---|---|---|---|---|
| July 1, 2025 – September 30, 2025 | Monitoring, Regular | Simazine | — | Archived |
| July 1, 2025 – September 30, 2025 | Monitoring, Regular | Atrazine | — | Archived |
| 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 |
Archived closed in EPA's records (typically due to age or a data correction)Resolved addressed and confirmed by the state
Enforcement actions
- December 17, 2025State Violation/Reminder Notice7 linked violations
- December 17, 2025State Public Notification requested5 linked violations
- December 17, 2025State Violation/Reminder Notice6 linked violations
- December 17, 2025State Public Notification requested6 linked violations
- July 29, 2014State 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
Contact
MUELLER, DON L.
618-566-7100
MASCOUTAH, IL 62258