Clean Water Act discharge permit · NPDES IA0033138
ROCKWELL CITY, CITY OF STP, Rockwell City, IA: NPDES IA0033138 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 14Pollutants under a numeric limit
- 11Pollutants with an effluent exceedance
ROCKWELL CITY, CITY OF STP, held by CITY OF ROCKWELL CITY, holds NPDES permit IA0033138. EPA’s file records it issued February 1, 2018 and expiring January 31, 2023. 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 | ROCKWELL CITY, CITY OF STP |
|---|---|
| Permittee as filed | CITY OF ROCKWELL CITY |
| NPDES ID | IA0033138 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | February 1, 2018 |
| Expiration date | January 31, 2023 |
| Issuing agency | STA |
| Address | Rockwell City, IA 50579 |
| Subwatershed | Drainage Ditch 13-Lake Creek (HUC 071000060603) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 16Pollutants on file
- 14Under a numeric limit
- 13With a violation of any kind
- 11With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 9 | 73 | 57 | February 28, 2026 | 367% over the limit |
| Nitrogen, ammonia total [as N] | 96 | 45 | 33 | December 31, 2024 | 315% over the limit |
| Oil & Grease | 2 | 15 | 13 | February 28, 2021 | 127% over the limit |
| Chloride [as Cl] | 4 | 12 | 12 | July 31, 2026 | 162% over the limit |
| Oxygen, dissolved [DO] | 1 | 14 | 10 | April 30, 2022 | 42% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 14 | 10 | May 31, 2011 | 341% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 26 | 8 | July 31, 2023 | 73% over the limit |
| Toxicity [acute], Ceriodaphnia dubia | 1 | 8 | 4 | September 30, 2022 | 100% over the limit |
| pH | 5 | 7 | 3 | September 30, 2019 | |
| E. coli | 0 | 3 | 2 | April 30, 2026 | 129% over the limit |
| Copper, total [as Cu] | 9 | 2 | 2 | March 31, 2026 | 195% over the limit |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 1 | 4 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 7 | 2 | 0 | ||
| Nitrogen, total [as N] | 10 | 0 | 0 | ||
| Phosphorus, total [as P] | 10 | 0 | 0 | ||
| BOD, 5-day, 20 deg. C | 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 IA0033138.
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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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 IA0033138 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.