Clean Water Act discharge permit · NPDES IA0042986
WALNUT CITY OF STP, Walnut, IA: NPDES IA0042986 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 7Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
WALNUT CITY OF STP, held by CITY OF WALNUT, holds NPDES permit IA0042986. EPA’s file records it issued April 30, 2001 and expiring April 29, 2006. 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 | WALNUT CITY OF STP |
|---|---|
| Permittee as filed | CITY OF WALNUT |
| NPDES ID | IA0042986 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | April 30, 2001 |
| Expiration date | April 29, 2006 |
| Issuing agency | STA |
| Address | Walnut, IA 51577 |
| Subwatershed | Headwaters Walnut Creek (HUC 102400020701) |
| 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
- 7Pollutants on file
- 7Under a numeric limit
- 5With a violation of any kind
- 5With 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 |
|---|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 2 | 57 | 55 | January 31, 2026 | 42,421% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 9 | 33 | 29 | November 30, 2025 | 16,067% over the limit |
| pH | 5 | 15 | 13 | February 28, 2026 | |
| Solids, total suspended | 9 | 16 | 12 | August 31, 2023 | 349% over the limit |
| Nitrogen, ammonia total [as N] | 28 | 12 | 8 | February 28, 2025 | 17,414% over the limit |
| Oxygen, dissolved [DO] | 3 | 0 | 0 | ||
| Solids, settleable | 3 | 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 IA0042986.
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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, IA0042986.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 IA0042986 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.