Clean Water Act discharge permit · NPDES IA0059081
WALKER CITY OF STP, Walker, IA: NPDES IA0059081 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 8Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
WALKER CITY OF STP, held by CITY OF WALKER, holds NPDES permit IA0059081. EPA’s file records it issued August 1, 2022 and expiring July 31, 2027. 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 | WALKER CITY OF STP |
|---|---|
| Permittee as filed | CITY OF WALKER |
| NPDES ID | IA0059081 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | August 1, 2022 |
| Expiration date | July 31, 2027 |
| Issuing agency | STA |
| Address | Walker, IA 52352 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | East Branch Blue Creek (HUC 070802051501) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 9Pollutants on file
- 8Under a numeric limit
- 7With a violation of any kind
- 7With 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 |
|---|---|---|---|---|---|
| BOD, carbonaceous [5 day, 20 C] | 4 | 42 | 17 | December 31, 2014 | 3,900% over the limit |
| Solids, total suspended | 9 | 45 | 13 | July 31, 2016 | 204% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 10 | 7 | May 31, 2004 | 228% over the limit |
| Nitrogen, ammonia total [as N] | 48 | 11 | 2 | May 31, 2025 | 69% over the limit |
| Nitrogen, total [as N] | 2 | 4 | 2 | July 31, 2025 | 6,619% over the limit |
| pH | 5 | 13 | 1 | April 30, 2006 | |
| Oxygen, dissolved [DO] | 1 | 1 | 1 | February 28, 2015 | 17% over the limit |
| BOD, 5-day, 20 deg. C | 5 | 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 IA0059081.
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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- One watershed — $2,990/year
- 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 IA0059081 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.