Clean Water Act discharge permit · NPDES IL0027341
MT. VERNON STP, CITY OF, Mount Vernon, IL: NPDES IL0027341 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 13Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
MT. VERNON STP, CITY OF, held by MT VERNON, CITY OF, holds NPDES permit IL0027341, which discharges to Casey Fork Creek To Big Muddy River. EPA’s file records it issued December 28, 2010 and expiring January 31, 2016. 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 | MT. VERNON STP, CITY OF |
|---|---|
| Permittee as filed | MT VERNON, CITY OF |
| NPDES ID | IL0027341 |
| 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 | December 28, 2010 |
| Expiration date | January 31, 2016 |
| Address | Mount Vernon, IL 62864 |
| Receiving water | CASEY FORK CREEK TO BIG MUDDY RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Town of Mount Vernon-Casey Fork (HUC 071401060103) |
| Program components on file | Biosolids, POTW, Pretreatment |
| 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
- 13Pollutants on file
- 13Under a numeric limit
- 6With a violation of any kind
- 2With 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 |
|---|---|---|---|---|---|
| Coliform, fecal general | 2 | 5 | 3 | May 31, 2019 | 650% over the limit |
| Solids, total suspended | 6 | 1 | 1 | March 31, 2018 | 43% over the limit |
| Nitrogen, ammonia total [as N] | 48 | 8 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 4 | 4 | 0 | ||
| Chlorine, total residual | 3 | 4 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 2 | 0 | ||
| Oxygen, dissolved [DO] | 5 | 0 | 0 | ||
| pH | 4 | 0 | 0 | ||
| BOD, 5-day, 20 deg. C | 2 | 0 | 0 | ||
| Phosphorus, total [as P] | 2 | 0 | 0 | ||
| Nitrogen, total [as N] | 1 | 0 | 0 | ||
| Zinc, total [as Zn] | 1 | 0 | 0 | ||
| Flow, total | 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
- 19Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 5, 2026 | Wet-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment | ST6 |
| June 6, 2025 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| May 19, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| May 8, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| May 8, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| May 8, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| May 8, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| May 4, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| April 25, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| April 5, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| March 23, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| March 23, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| March 23, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| March 23, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| March 23, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| March 23, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| March 23, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| March 23, 2025 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
| December 16, 2024 | Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | ST6 |
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.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.