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Clean Water Act discharge permit · NPDES IA0035220

DECORAH CITY OF STP, Decorah, IA: NPDES IA0035220 discharge permit, effluent exceedances, inspections, penalties

DECORAH CITY OF STP, held by CITY OF DECORAH, holds NPDES permit IA0035220. EPA’s file records it issued September 1, 2017 and expiring August 31, 2022.

DECORAH CITY OF STP, Decorah, Iowa: Individual permit IA0035220, held by CITY OF DECORAH; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued September 1, 2017, term to August 31, 2022, by STA; Sewage Treatment Facilities.

  • Toxicity [acute], Ceriodaphnia dubia: 1 limit, 3 violations of any kind, 2 effluent exceedances, latest May 31, 2015, largest 100% over the limit.
  • Copper, total [as Cu]: 0 limits, 2 violations of any kind, 2 effluent exceedances, latest January 31, 2006, largest 70% over the limit.
  • Toxicity [acute], Pimephales promelas [Fathead Minnow]: 1 limit, 3 violations of any kind, 1 effluent exceedance, latest May 31, 2015, largest 100% over the limit.
  • E. coli: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest October 31, 2008, largest 55% over the limit.
  • Cyanide, total [as CN]: 0 limits, 52 violations of any kind, 0 effluent exceedances.
  • Chromium, total [as Cr]: 0 limits, 52 violations of any kind, 0 effluent exceedances.
  • Coliform, fecal general: 0 limits, 10 violations of any kind, 0 effluent exceedances.
  • Solids, total suspended: 9 limits, 8 violations of any kind, 0 effluent exceedances.
  • BOD, carbonaceous [5 day, 20 C]: 4 limits, 8 violations of any kind, 0 effluent exceedances.
  • pH: 5 limits, 4 violations of any kind, 0 effluent exceedances.
  • Nitrogen, ammonia total [as N]: 48 limits, 0 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; 261 were issued before IA0035220. CITY OF DECORAH holds 2 permits in Iowa.

Other permits held by CITY OF DECORAH

Coverages issued nearest IA0035220

DECORAH CITY OF STP among its neighbors

EPA’s permit file holds 1 discharge permits in the Community of Freeport-Upper Iowa River subwatershed (HUC 070600020408), IA0035220 among them. Its county holds 12, 1 of them major permits; IA0035220 is a major permit.

Identity

Facility as filedDECORAH CITY OF STP
Permittee as filedCITY OF DECORAH
NPDES IDIA0035220
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, 2017
Expiration dateAugust 31, 2022
Issuing agencySTA
AddressDecorah, IA 52101
Receiving water impaired303(D) Listed
SubwatershedCommunity of Freeport-Upper Iowa River (HUC 070600020408)
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
Toxicity [acute], Ceriodaphnia dubia132May 31, 2015100% over the limit
Copper, total [as Cu]022January 31, 200670% over the limit
Toxicity [acute], Pimephales promelas [Fathead Minnow]131May 31, 2015100% over the limit
E. coli011October 31, 200855% over the limit
Cyanide, total [as CN]0520
Chromium, total [as Cr]0520
Coliform, fecal general0100
Solids, total suspended980
BOD, carbonaceous [5 day, 20 C]480
pH540
Nitrogen, ammonia total [as N]4800
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 IA0035220.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0035220.

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 IA0035220.

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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 the NPDES IA0035220 discharge permit held by CITY OF DECORAH for the DECORAH CITY OF STP in Decorah, IA, with a permit status of administratively continued and a Major Discharger class. The facts list 10 pollutants under a numeric limit and 4 pollutants with an effluent exceedance, and the permit was issued September 1, 2017 and expired August 31, 2022.