Clean Water Act discharge permit · NPDES IA0023302
DENISON MUNICIPAL UTILITIES-STP, Denison, IA: NPDES IA0023302 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 15Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
DENISON MUNICIPAL UTILITIES-STP, held by DENISON MUNICIPAL UTILITIES, holds NPDES permit IA0023302. EPA’s file records it issued January 1, 2021 and expiring December 31, 2025. 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 | DENISON MUNICIPAL UTILITIES-STP |
|---|---|
| Permittee as filed | DENISON MUNICIPAL UTILITIES |
| NPDES ID | IA0023302 |
| 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 | January 1, 2021 |
| Expiration date | December 31, 2025 |
| Issuing agency | STA |
| Address | Denison, IA 51442 |
| Subwatershed | Welsh Creek-Boyer River (HUC 102300070304) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 16Pollutants on file
- 15Under a numeric limit
- 7With a violation of any kind
- 4With 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] | 48 | 43 | 19 | September 30, 2023 | 222% over the limit |
| pH | 5 | 27 | 13 | June 30, 2023 | |
| Solids, total suspended | 9 | 27 | 3 | November 30, 2011 | 9% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 13 | 1 | October 31, 1998 | 4% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 24 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 1 | 6 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 1 | 6 | 0 | ||
| Nitrogen, total [as N] | 15 | 0 | 0 | ||
| Phosphorus, total [as P] | 10 | 0 | 0 | ||
| Copper, total [as Cu] | 9 | 0 | 0 | ||
| Thallium, total [as Tl] | 9 | 0 | 0 | ||
| BOD, 5-day, 20 deg. C | 5 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 5 | 0 | 0 | ||
| Chloride [as Cl] | 5 | 0 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 0 | 0 | ||
| E. coli | 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 IA0023302.
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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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 IA0023302 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.