Clean Water Act discharge permit · NPDES IA0023710
MOUNT VERNON CITY OF STP, Mount Vernon, IA: NPDES IA0023710 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 14Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
MOUNT VERNON CITY OF STP, held by CITY OF MOUNT VERNON, holds NPDES permit IA0023710. EPA’s file records it issued July 1, 2020 and expiring June 30, 2025. 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 | MOUNT VERNON CITY OF STP |
|---|---|
| Permittee as filed | CITY OF MOUNT VERNON |
| NPDES ID | IA0023710 |
| 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 | July 1, 2020 |
| Expiration date | June 30, 2025 |
| Issuing agency | STA |
| Address | Mount Vernon, IA 52314 |
| Subwatershed | Spring Creek-Cedar River (HUC 070802060403) |
| Program components on file | Biosolids, POTW |
| NAICS | 221320 – Sewage Treatment Facilities |
| 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
- 14Pollutants on file
- 14Under a numeric limit
- 10With a violation of any kind
- 6With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 96 | 16 | 12 | August 31, 2024 | 128% over the limit |
| Chloride [as Cl] | 4 | 31 | 7 | June 30, 2026 | 8% over the limit |
| Copper, total [as Cu] | 8 | 17 | 5 | December 31, 2023 | 346% over the limit |
| Oxygen, dissolved [DO] | 1 | 10 | 5 | August 31, 2015 | 58% over the limit |
| E. coli | 1 | 2 | 2 | August 31, 2021 | 376% over the limit |
| pH | 5 | 7 | 1 | July 31, 2015 | |
| Toxicity [acute], Ceriodaphnia dubia | 1 | 28 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 1 | 28 | 0 | ||
| Solids, total suspended | 9 | 12 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 4 | 10 | 0 | ||
| Nitrogen, total [as N] | 10 | 0 | 0 | ||
| Phosphorus, total [as P] | 10 | 0 | 0 | ||
| BOD, 5-day, 20 deg. C | 5 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 5 | 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 IA0023710.
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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Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.