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Clean Water Act discharge permit · NPDES IA0040266

RED OAK CITY OF STP, Red Oak, IA: NPDES IA0040266 discharge permit, effluent exceedances, inspections, penalties

RED OAK CITY OF STP, held by CITY OF RED OAK, holds NPDES permit IA0040266. EPA’s file records it issued September 1, 2019 and expiring August 31, 2024.

RED OAK CITY OF STP, Red Oak, Iowa: Individual permit IA0040266, held by CITY OF RED OAK; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued September 1, 2019, term to August 31, 2024, by STA; Sewage Treatment Facilities.

  • Nitrogen, ammonia total [as N]: 48 limits, 8 violations of any kind, 4 effluent exceedances, latest October 31, 2024, largest 4,515% over the limit.
  • Solids, total suspended: 9 limits, 13 violations of any kind, 1 effluent exceedance, latest March 31, 2026, largest 29% over the limit.
  • pH: 5 limits, 7 violations of any kind, 1 effluent exceedance, latest June 30, 2003.
  • E. coli: 1 limit, 1 violation of any kind, 1 effluent exceedance, latest July 31, 2023, largest 10% over the limit.
  • BOD, carbonaceous [5 day, 20 C]: 4 limits, 12 violations of any kind, 0 effluent exceedances.
  • Oxygen, dissolved [DO]: 1 limit, 4 violations of any kind, 0 effluent exceedances.
  • Toxicity [acute], Ceriodaphnia dubia: 1 limit, 4 violations of any kind, 0 effluent exceedances.
  • Toxicity [acute], Pimephales promelas [Fathead Minnow]: 1 limit, 4 violations of any kind, 0 effluent exceedances.
  • Nitrogen, total [as N]: 10 limits, 0 violations of any kind, 0 effluent exceedances.
  • Phosphorus, total [as P]: 10 limits, 0 violations of any kind, 0 effluent exceedances.
  • BOD, 5-day, 20 deg. C: 5 limits, 0 violations of any kind, 0 effluent exceedances.
  • Nitrogen, Kjeldahl, total [as N]: 5 limits, 0 violations of any kind, 0 effluent exceedances.

Iowa holds 734 Publicly owned treatment works coverages of this permit type in EPA’s file; 466 were issued before IA0040266. CITY OF RED OAK holds 2 permits in Iowa.

Other permits held by CITY OF RED OAK

Coverages issued nearest IA0040266

RED OAK CITY OF STP among its neighbors

EPA’s permit file holds 2 discharge permits in the Mormon Branch-East Nishnabotna River subwatershed (HUC 102400030702), IA0040266 among them. Its county holds 4, 1 of them major permits; IA0040266 is a major permit.

Other permits in the Mormon Branch-East Nishnabotna River subwatershed (HUC 102400030702)

Identity

Facility as filedRED OAK CITY OF STP
Permittee as filedCITY OF RED OAK
NPDES IDIA0040266
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedSeptember 1, 2019
Expiration dateAugust 31, 2024
Issuing agencySTA
AddressRed Oak, IA 51566
SubwatershedMormon Branch-East Nishnabotna River (HUC 102400030702)
Program components on fileBiosolids, POTW
NAICS221320 – Sewage Treatment Facilities
SIC4952 – Sewerage Systems

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Nitrogen, ammonia total [as N]4884October 31, 20244,515% over the limit
Solids, total suspended9131March 31, 202629% over the limit
pH571June 30, 2003
E. coli111July 31, 202310% over the limit
BOD, carbonaceous [5 day, 20 C]4120
Oxygen, dissolved [DO]140
Toxicity [acute], Ceriodaphnia dubia140
Toxicity [acute], Pimephales promelas [Fathead Minnow]140
Nitrogen, total [as N]1000
Phosphorus, total [as P]1000
BOD, 5-day, 20 deg. C500
Nitrogen, Kjeldahl, total [as N]500

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0040266.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0040266.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES IA0040266.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

This public-records page covers Clean Water Act discharge permit NPDES IA0040266, held by CITY OF RED OAK for the RED OAK CITY OF STP in Red Oak, IA, with a status of administratively continued and a Major Discharger class. The page lists 4 pollutants under a numeric limit and 4 pollutants with an effluent exceedance, with the permit issued September 1, 2019 and expiring August 31, 2024, drawn from the EPA permit file as loaded on October 14, 2026.