Clean Water Act discharge permit · NPDES IL0021083
CASEYVILLE TOWNSHIP EAST STP, O'Fallon, IL: NPDES IL0021083 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 32Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
CASEYVILLE TOWNSHIP EAST STP, held by CASEYVILLE TOWNSHIP, holds NPDES permit IL0021083, which discharges to Ellen Creek. EPA’s file records it issued September 29, 2016 and expiring September 30, 2021. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CASEYVILLE TOWNSHIP EAST STP |
|---|---|
| Permittee as filed | CASEYVILLE TOWNSHIP |
| NPDES ID | IL0021083 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 29, 2016 |
| Expiration date | September 30, 2021 |
| Address | O'Fallon, IL 62269 |
| Receiving water | ELLEN CREEK |
| Subwatershed | Ogles Creek (HUC 071402040507) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 32Pollutants on file
- 32Under a numeric limit
- 13With a violation of any kind
- 3With 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 |
|---|---|---|---|---|---|
| Phosphorus, total [as P] | 3 | 34 | 28 | July 31, 2026 | 233% over the limit |
| Nitrogen, ammonia total [as N] | 51 | 28 | 20 | August 31, 2007 | 318% over the limit |
| Zinc, total [as Zn] | 2 | 10 | 2 | February 28, 2026 | 13% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 16 | 0 | ||
| Solids, total suspended | 7 | 12 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 8 | 0 | ||
| pH | 4 | 6 | 0 | ||
| Nitrogen, total [as N] | 4 | 6 | 0 | ||
| Chlorine, total residual | 3 | 5 | 0 | ||
| Oxygen, dissolved [DO] | 5 | 4 | 0 | ||
| Coliform, fecal general | 2 | 3 | 0 | ||
| BOD, 5-day, 20 deg. C | 3 | 2 | 0 | ||
| Flow, total | 1 | 1 | 0 | ||
| Oil & Grease | 2 | 0 | 0 | ||
| Cyanide, total [as CN] | 2 | 0 | 0 | ||
| Cyanide, free [amenable to chlorination] | 2 | 0 | 0 | ||
| Fluoride, total [as F] | 2 | 0 | 0 | ||
| Arsenic, total [as As] | 2 | 0 | 0 | ||
| Barium, total [as Ba] | 2 | 0 | 0 | ||
| Cadmium, total [as Cd] | 2 | 0 | 0 | ||
| Chromium, hexavalent [as Cr] | 2 | 0 | 0 | ||
| Chromium, total [as Cr] | 2 | 0 | 0 | ||
| Copper, total [as Cu] | 2 | 0 | 0 | ||
| Iron, total [as Fe] | 2 | 0 | 0 | ||
| Iron, dissolved [as Fe] | 2 | 0 | 0 | ||
| Lead, total [as Pb] | 2 | 0 | 0 | ||
| Manganese, total [as Mn] | 2 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Silver, total [as Ag] | 2 | 0 | 0 | ||
| Selenium, total [as Se] | 2 | 0 | 0 | ||
| Phenolics, total recoverable | 2 | 0 | 0 | ||
| Mercury, total [as Hg] | 2 | 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 IL0021083.
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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
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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 IL0021083 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.