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Clean Water Act discharge permit · NPDES IA0032433

WASHINGTON CITY OF STP, Washington, IA: NPDES IA0032433 discharge permit, effluent exceedances, inspections, penalties

WASHINGTON CITY OF STP, held by CITY OF WASHINGTON, holds NPDES permit IA0032433. EPA’s file records it issued October 1, 2021 and expiring September 30, 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 filedWASHINGTON CITY OF STP
Permittee as filedCITY OF WASHINGTON
NPDES IDIA0032433
Permit statusEffective
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedOctober 1, 2021
Expiration dateSeptember 30, 2026
Issuing agencySTA
AddressWashington, IA 52353
SubwatershedMiddle West Fork Crooked Creek (HUC 070801070102)
Program components on fileBiosolids, POTW
NAICS221320 – Sewage Treatment Facilities
SIC4952 – Sewerage Systems
Other EPA IDs (FRS)RCRA handler IAD000671537

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.

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]4844July 31, 2025186% over the limit
Solids, total suspended9113April 30, 2025944% over the limit
Toxicity [acute], Ceriodaphnia dubia122July 31, 2023100% over the limit
BOD, carbonaceous [5 day, 20 C]480
pH540
Oxygen, dissolved [DO]140
Nitrogen, total [as N]1000
Phosphorus, total [as P]1000
BOD, 5-day, 20 deg. C500
Nitrogen, Kjeldahl, total [as N]500
Toxicity [acute], Pimephales promelas [Fathead Minnow]100

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 IA0032433.

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 EPA public-records page covers the NPDES IA0032433 Clean Water Act discharge permit held by the City of Washington for the WASHINGTON CITY OF STP in Washington, IA, an Effective, Individual, Major-class publicly owned treatment works. The file lists 11 pollutants under a numeric limit and 3 pollutants with an effluent exceedance, with the permit issued October 1, 2021 and expiring September 30, 2026.