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Clean Water Act discharge permit · NPDES IA0041815

OSCEOLA CITY OF STP, Osceola, IA: NPDES IA0041815 discharge permit, effluent exceedances, inspections, penalties

OSCEOLA CITY OF STP, held by CITY OF OSCEOLA, holds NPDES permit IA0041815. EPA’s file records it issued November 1, 2024 and expiring October 31, 2029. 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 filedOSCEOLA CITY OF STP
Permittee as filedCITY OF OSCEOLA
NPDES IDIA0041815
Permit statusEffective
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedNovember 1, 2024
Expiration dateOctober 31, 2029
Issuing agencySTA
AddressOsceola, IA 50213
SubwatershedHeadwaters White Breast Creek (HUC 071000081302)
Program components on fileBiosolids, POTW
NAICS221320 – Sewage Treatment Facilities
SIC4952 – 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

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
Copper, total [as Cu]4165157July 31, 20262,134% over the limit
Nitrogen, ammonia total [as N]48126122July 31, 20241,057% over the limit
Chloride [as Cl]45749March 31, 2026145% over the limit
BOD, carbonaceous [5 day, 20 C]44432August 31, 2024280% over the limit
Cyanide, total [as CN]41511October 31, 2025746% over the limit
E. coli11111July 31, 202448,597% over the limit
Chromium, hexavalent [as Cr]444November 30, 202332% over the limit
Solids, total suspended4142November 30, 20252% over the limit
Oxygen, dissolved [DO]161August 31, 201616% over the limit
pH260
Toxicity [acute], Ceriodaphnia dubia110
Toxicity [acute], Pimephales promelas [Fathead Minnow]110

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0041815.

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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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 IA0041815 for OSCEOLA CITY OF STP in Osceola, IA, held by CITY OF OSCEOLA, with an effective permit status and a Major Discharger class. The page lists 12 pollutants on file, 9 of which are under a numeric limit and 9 of which show an effluent exceedance, with the permit issued November 1, 2024 and expiring October 31, 2029.