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Clean Water Act discharge permit · NPDES IA0035939

GRIMES, CITY OF STP, Grimes, IA: NPDES IA0035939 discharge permit, effluent exceedances, inspections, penalties

GRIMES, CITY OF STP, held by City of Grimes, holds NPDES permit IA0035939. EPA’s file records it issued February 1, 2016 and expiring January 31, 2021.

GRIMES, CITY OF STP, Grimes, Iowa: Individual permit IA0035939, held by City of Grimes; Publicly owned treatment works; Effective; issued February 1, 2016, term to January 31, 2021, by STA; Sewage Treatment Facilities.

  • Nitrogen, ammonia total [as N]: 0 limits, 108 violations of any kind, 108 effluent exceedances, latest February 29, 2024, largest 1,773% over the limit.
  • Oxygen, dissolved [DO]: 0 limits, 12 violations of any kind, 8 effluent exceedances, latest October 31, 2021, largest 64% over the limit.
  • Solids, total suspended: 0 limits, 14 violations of any kind, 6 effluent exceedances, latest January 31, 2024, largest 567% over the limit.
  • Toxicity [acute], Ceriodaphnia dubia: 0 limits, 2 violations of any kind, 2 effluent exceedances, latest June 30, 2021, largest 100% over the limit.
  • Nitrogen, nitrate total [as N]: 0 limits, 5 violations of any kind, 1 effluent exceedance, latest October 31, 2023, largest 3% over the limit.
  • Toxicity [acute], Pimephales promelas [Fathead Minnow]: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest June 30, 2021, largest 100% over the limit.
  • BOD, carbonaceous [5 day, 20 C]: 0 limits, 8 violations of any kind, 0 effluent exceedances.
  • pH: 0 limits, 4 violations of any kind, 0 effluent exceedances.

Iowa holds 734 Publicly owned treatment works coverages of this permit type in EPA’s file; 125 were issued before IA0035939. City of Grimes holds 2 permits in Iowa.

Other permits held by City of Grimes

Coverages issued nearest IA0035939

GRIMES, CITY OF STP among its neighbors

EPA’s permit file holds 4 discharge permits in the Beaver Creek subwatershed (HUC 071000040911), IA0035939 among them. Its county holds 49, 4 of them major permits; IA0035939 is a major permit.

Other permits in the Beaver Creek subwatershed (HUC 071000040911)

Identity

Facility as filedGRIMES, CITY OF STP
Permittee as filedCity of Grimes
NPDES IDIA0035939
Permit statusEffective
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedFebruary 1, 2016
Expiration dateJanuary 31, 2021
Issuing agencySTA
AddressGrimes, IA 50111
SubwatershedBeaver Creek (HUC 071000040911)
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]0108108February 29, 20241,773% over the limit
Oxygen, dissolved [DO]0128October 31, 202164% over the limit
Solids, total suspended0146January 31, 2024567% over the limit
Toxicity [acute], Ceriodaphnia dubia022June 30, 2021100% over the limit
Nitrogen, nitrate total [as N]051October 31, 20233% over the limit
Toxicity [acute], Pimephales promelas [Fathead Minnow]011June 30, 2021100% over the limit
BOD, carbonaceous [5 day, 20 C]080
pH040

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0035939.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0035939.

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 IA0035939.

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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 discharge permit IA0035939 held by City of Grimes for the GRIMES, CITY OF STP facility in Grimes, IA, a Major Discharger classified as a publicly owned treatment works with an Effective permit status, issued February 1, 2016 and expiring January 31, 2021. The page lists 6 pollutants with an effluent exceedance and 8 pollutants on file, with 8 pollutants showing a violation of any kind, as of October 14, 2026.