Clean Water Act discharge permit · NPDES IA0033731
SIOUX CENTER CITY OF STP, Sioux Center, IA: NPDES IA0033731 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 18Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
SIOUX CENTER CITY OF STP, held by CITY OF SIOUX CENTER, holds NPDES permit IA0033731. EPA’s file records it issued March 1, 2021 and expiring February 28, 2026. 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 | SIOUX CENTER CITY OF STP |
|---|---|
| Permittee as filed | CITY OF SIOUX CENTER |
| NPDES ID | IA0033731 |
| 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 | March 1, 2021 |
| Expiration date | February 28, 2026 |
| Issuing agency | STA |
| Address | Sioux Center, IA 51250 |
| Program components on file | Biosolids, POTW |
| 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
- 18Pollutants on file
- 18Under a numeric limit
- 12With 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 |
|---|---|---|---|---|---|
| Copper, total [as Cu] | 4 | 15 | 5 | June 30, 2022 | 56% over the limit |
| Solids, total suspended | 9 | 14 | 4 | February 28, 2018 | 28% over the limit |
| Chloride [as Cl] | 4 | 3 | 3 | April 30, 2026 | 26% over the limit |
| Chromium, total [as Cr] | 4 | 7 | 1 | November 30, 2025 | 106% over the limit |
| pH | 5 | 6 | 1 | December 31, 2021 | |
| Oxygen, dissolved [DO] | 1 | 5 | 1 | March 31, 2026 | 26% over the limit |
| Selenium, total [as Se] | 4 | 1 | 1 | April 30, 2026 | 11% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 10 | 0 | ||
| Nitrogen, ammonia total [as N] | 48 | 4 | 0 | ||
| Cyanide, total [as CN] | 4 | 4 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 1 | 2 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 1 | 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 | ||
| Nitrogen, Kjeldahl, total [as N] | 5 | 0 | 0 | ||
| Cadmium, total [as Cd] | 4 | 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 IA0033731.
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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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.