Clean Water Act discharge permit · NPDES IL0023043
CASEYVILLE TOWNSHIP - WEST STP, O'Fallon, IL: NPDES IL0023043 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 11Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
CASEYVILLE TOWNSHIP - WEST STP, held by CASEYVILLE TOWNSHIP, holds NPDES permit IL0023043, which discharges to Clair Creek. EPA’s file records it issued September 30, 2019 and expiring September 30, 2024. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CASEYVILLE TOWNSHIP - WEST STP |
|---|---|
| Permittee as filed | CASEYVILLE TOWNSHIP |
| NPDES ID | IL0023043 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | September 30, 2019 |
| Expiration date | September 30, 2024 |
| Address | O'Fallon, IL 62269 |
| Receiving water | CLAIR CREEK |
| Subwatershed | Schoenberger Creek (HUC 071401010502) |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 12Pollutants on file
- 11Under a numeric limit
- 11With a violation of any kind
- 1With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Solids, total suspended | 8 | 12 | 4 | February 28, 2022 | 100% over the limit |
| Nitrogen, ammonia total [as N] | 17 | 8 | 0 | ||
| pH | 6 | 6 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 6 | 0 | ||
| BOD, 5-day, 20 deg. C | 4 | 4 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 4 | 4 | 0 | ||
| Chlorine, total residual | 3 | 4 | 0 | ||
| Nitrogen, total [as N] | 0 | 4 | 0 | ||
| Oxygen, dissolved [DO] | 8 | 3 | 0 | ||
| Coliform, fecal general | 3 | 2 | 0 | ||
| Flow, total | 2 | 1 | 0 | ||
| Coliform, fecal - % samples exceeding limit | 1 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES IL0023043.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, IL0023043.
Start the watch
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID IL0023043 there.
Nearby on the register
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- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.