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Clean Water Act discharge permit · NPDES IA0035319

DALLAS CENTER CITY OF STP, Dallas Center, IA: NPDES IA0035319 discharge permit, effluent exceedances, inspections, penalties

DALLAS CENTER CITY OF STP, held by CITY OF DALLAS CENTER, holds NPDES permit IA0035319. EPA’s file records it issued August 1, 2016 and expiring July 31, 2021.

DALLAS CENTER CITY OF STP, Dallas Center, Iowa: Individual permit IA0035319, held by CITY OF DALLAS CENTER; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued August 1, 2016, term to July 31, 2021, by STA.

  • Oxygen, dissolved [DO]: 1 limit, 40 violations of any kind, 36 effluent exceedances, latest January 31, 2021, largest 49% over the limit.
  • BOD, carbonaceous [5 day, 20 C]: 4 limits, 27 violations of any kind, 19 effluent exceedances, latest July 31, 2026, largest 110% over the limit.
  • Nitrogen, ammonia total [as N]: 248 limits, 17 violations of any kind, 17 effluent exceedances, latest March 31, 2026, largest 592% over the limit.
  • Solids, total suspended: 9 limits, 19 violations of any kind, 7 effluent exceedances, latest May 31, 2024, largest 296% over the limit.
  • pH: 5 limits, 8 violations of any kind, 4 effluent exceedances, latest April 30, 2025.
  • E. coli: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest July 31, 2022, largest 47% over the limit.
  • Toxicity [acute], Ceriodaphnia dubia: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest January 31, 2023, largest 100% over the limit.
  • Toxicity [acute], Pimephales promelas [Fathead Minnow]: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest January 31, 2023, largest 593% over the limit.
  • Nitrogen, Kjeldahl, total [as N]: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • BOD, 5-day, 20 deg. C: 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; 139 were issued before IA0035319.

Coverages issued nearest IA0035319

DALLAS CENTER CITY OF STP among its neighbors

EPA’s permit file holds 2 discharge permits in the Little Walnut Creek-Walnut Creek subwatershed (HUC 071000061601), IA0035319 among them. Its county holds 19, 4 of them major permits; IA0035319 is a major permit.

Other permits in the Little Walnut Creek-Walnut Creek subwatershed (HUC 071000061601)

  • CITY OF WAUKEE, Waukee: IAL032794, minor permit, permit term to December 31, 2025

Identity

Facility as filedDALLAS CENTER CITY OF STP
Permittee as filedCITY OF DALLAS CENTER
NPDES IDIA0035319
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
IssuedAugust 1, 2016
Expiration dateJuly 31, 2021
Issuing agencySTA
AddressDallas Center, IA 50063
SubwatershedLittle Walnut Creek-Walnut Creek (HUC 071000061601)

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
Oxygen, dissolved [DO]14036January 31, 202149% over the limit
BOD, carbonaceous [5 day, 20 C]42719July 31, 2026110% over the limit
Nitrogen, ammonia total [as N]2481717March 31, 2026592% over the limit
Solids, total suspended9197May 31, 2024296% over the limit
pH584April 30, 2025
E. coli011July 31, 202247% over the limit
Toxicity [acute], Ceriodaphnia dubia011January 31, 2023100% over the limit
Toxicity [acute], Pimephales promelas [Fathead Minnow]011January 31, 2023593% over the limit
Nitrogen, Kjeldahl, total [as N]240
BOD, 5-day, 20 deg. C500

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0035319.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0035319.

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 IA0035319.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

This public-records page covers the Clean Water Act NPDES discharge permit IA0035319 for DALLAS CENTER CITY OF STP in Dallas Center, IA, held by CITY OF DALLAS CENTER and listed as administratively continued. The page lists 7 pollutants under a numeric limit, 8 pollutants with an effluent exceedance, 10 pollutants on file, and 9 pollutants with a violation of any kind.