Clean Water Act discharge permit · NPDES IA0049573
CORYDON CITY OF STP, Corydon, IA: NPDES IA0049573 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 10Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
CORYDON CITY OF STP, held by CITY OF CORYDON, holds NPDES permit IA0049573. EPA’s file records it issued July 1, 2021 and expiring June 30, 2026. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CORYDON CITY OF STP |
|---|---|
| Permittee as filed | CITY OF CORYDON |
| NPDES ID | IA0049573 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | July 1, 2021 |
| Expiration date | June 30, 2026 |
| Issuing agency | STA |
| Address | Corydon, IA 50060 |
| Subwatershed | West Jackson Creek (HUC 102802010103) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 12Pollutants on file
- 10Under a numeric limit
- 9With a violation of any kind
- 8With 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 | 171 | 171 | March 31, 2025 | 546% over the limit |
| Oxygen, dissolved [DO] | 1 | 29 | 25 | April 30, 2026 | 40% over the limit |
| pH | 5 | 28 | 24 | March 31, 2019 | |
| BOD, carbonaceous [5 day, 20 C] | 4 | 28 | 20 | June 30, 2026 | 6,040% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 7 | 7 | December 31, 2019 | 9,021% over the limit |
| Solids, total suspended | 9 | 18 | 5 | April 30, 2018 | 10% over the limit |
| Oil & Grease | 2 | 3 | 3 | August 31, 2024 | 1,290% over the limit |
| E. coli | 0 | 1 | 1 | October 31, 2024 | 15% over the limit |
| Phosphorus, total [as P] | 2 | 4 | 0 | ||
| BOD, 5-day, 20 deg. C | 5 | 0 | 0 | ||
| Copper, total [as Cu] | 5 | 0 | 0 | ||
| Lead, total [as Pb] | 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 IA0049573.
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
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Start the watch
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- One state — $4,990/year
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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 IA0049573 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.