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Clean Water Act discharge permit · NPDES IA0000256

ROQUETTE AMERICA, INC., Keokuk, IA: NPDES IA0000256 discharge permit, effluent exceedances, inspections, penalties

ROQUETTE AMERICA, INC. holds NPDES permit IA0000256. EPA’s file records it issued July 1, 2018 and expiring June 30, 2023.

ROQUETTE AMERICA, INC., Keokuk, Iowa: Individual permit IA0000256; Administratively continued (past its expiration date and still in force until reissued); issued July 1, 2018, term to June 30, 2023, by STA; Wet Corn Milling and Starch Manufacturing.

  • pH: 11 limits, 110 violations of any kind, 99 effluent exceedances, latest May 31, 2026.
  • Solids, total suspended: 11 limits, 98 violations of any kind, 68 effluent exceedances, latest September 30, 2024, largest 387% over the limit.
  • Temperature, water deg. fahrenheit: 0 limits, 39 violations of any kind, 39 effluent exceedances, latest July 31, 2011, largest 15% over the limit.
  • Chlorine, total residual: 16 limits, 118 violations of any kind, 36 effluent exceedances, latest June 30, 2025, largest 932% over the limit.
  • BOD, 5-day, 20 deg. C: 7 limits, 28 violations of any kind, 26 effluent exceedances, latest July 31, 2026, largest 454% over the limit.
  • Nitrogen, ammonia total [as N]: 48 limits, 24 violations of any kind, 12 effluent exceedances, latest June 30, 2026, largest 109% over the limit.
  • Nickel, total [as Ni]: 7 limits, 16 violations of any kind, 12 effluent exceedances, latest May 31, 2026, largest 1,373% over the limit.
  • Zinc, total [as Zn]: 2 limits, 17 violations of any kind, 11 effluent exceedances, latest December 31, 2012, largest 1,136% over the limit.
  • Chloroform: 2 limits, 14 violations of any kind, 10 effluent exceedances, latest December 31, 2004, largest 29,725% over the limit.
  • Cyanide, total [as CN]: 2 limits, 16 violations of any kind, 8 effluent exceedances, latest January 31, 2003, largest 1,445% over the limit.
  • Phenol: 2 limits, 20 violations of any kind, 7 effluent exceedances, latest March 31, 2026, largest 19,900% over the limit.
  • Copper, total [as Cu]: 2 limits, 8 violations of any kind, 4 effluent exceedances, latest May 31, 2010, largest 37,222% over the limit.
  • Toxicity [acute], Ceriodaphnia dubia: 1 limit, 9 violations of any kind, 3 effluent exceedances, latest June 30, 2016, largest 100% over the limit.
  • Chromium, total [as Cr]: 2 limits, 8 violations of any kind, 2 effluent exceedances, latest January 31, 2003, largest 1,047% over the limit.
  • Flow, in conduit or thru treatment plant: 0 limits, 3 violations of any kind, 2 effluent exceedances, latest December 31, 2009, largest 1,007% over the limit.
  • Di[2-ethylhexyl] phthalate [DEHP]: 2 limits, 5 violations of any kind, 1 effluent exceedance, latest December 31, 2010, largest 55% over the limit.
  • Hexachlorobenzene: 4 limits, 12 violations of any kind, 0 effluent exceedances.
  • 1,3-Dichloropropene: 2 limits, 10 violations of any kind, 0 effluent exceedances.
  • 1,2-Dichloroethane: 2 limits, 8 violations of any kind, 0 effluent exceedances.
  • Chloroethane: 2 limits, 8 violations of any kind, 0 effluent exceedances.
  • Lead, total [as Pb]: 2 limits, 6 violations of any kind, 0 effluent exceedances.
  • Acenaphthylene: 2 limits, 6 violations of any kind, 0 effluent exceedances.
  • Acenaphthene: 2 limits, 6 violations of any kind, 0 effluent exceedances.
  • Methyl chloride [Chloromethane]: 2 limits, 6 violations of any kind, 0 effluent exceedances.
  • Pyrene: 2 limits, 6 violations of any kind, 0 effluent exceedances.
  • 4-Nitrophenol: 2 limits, 6 violations of any kind, 0 effluent exceedances.
  • Vinyl chloride: 2 limits, 6 violations of any kind, 0 effluent exceedances.
  • Tetrachloroethene: 2 limits, 6 violations of any kind, 0 effluent exceedances.
  • Carbon tetrachloride: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Toluene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Benzene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Acrylonitrile: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Benzo[b]fluoranthene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Benzo[k]fluoranthene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Benzo[a]pyrene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Chrysene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Diethyl phthalate: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Dimethyl phthalate: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Ethylbenzene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Fluoranthene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Hexachloroethane: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Methylene chloride: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Nitrobenzene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Phenanthrene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 1,1-Dichloroethane: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 1,1-Dichloroethylene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 1,1,1-Trichloroethane: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 1,1,2-Trichloroethane: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Benzo[a]anthracene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 1,2-Dichlorobenzene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 1,2-Dichloropropane: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • trans-1,2-Dichloroethylene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 1,2,4-Trichlorobenzene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 1,3-Dichlorobenzene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 1,4-Dichlorobenzene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 2-Chlorophenol: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 2-Nitrophenol: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 2,4-Dichlorophenol: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 2,4-Dimethylphenol: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • 2,4-Dinitrotoluene: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • March 10, 2026: Sampling (E).
  • March 10, 2026: Sampling (E).

Other permits held by ROQUETTE AMERICA, INC.

ROQUETTE AMERICA, INC. among its neighbors

EPA’s permit file holds 6 discharge permits in the Cedar Glen Creek-Mississippi River subwatershed (HUC 070801041806), IA0000256 among them. Its county holds 19, 5 of them major permits; IA0000256 is a major permit.

Other permits in the Cedar Glen Creek-Mississippi River subwatershed (HUC 070801041806)

Identity

Facility as filedROQUETTE AMERICA, INC.
Permittee as filedROQUETTE AMERICA, INC.
NPDES IDIA0000256
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typeNot a publicly owned treatment works
IssuedJuly 1, 2018
Expiration dateJune 30, 2023
Issuing agencySTA
AddressKeokuk, IA 52632
Receiving water impaired303(D) Listed
SubwatershedCedar Glen Creek-Mississippi River (HUC 070801041806)
NAICS311221 – Wet Corn Milling and Starch Manufacturing
SIC2046 – Wet Corn Milling
Other EPA IDs (FRS)RCRA handler IAR000000489; ICIS-AIR source IA0000001911100065

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; the 60 with the most exceedances of 75 are shown.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
pH1111099May 31, 2026
Solids, total suspended119868September 30, 2024387% over the limit
Temperature, water deg. fahrenheit03939July 31, 201115% over the limit
Chlorine, total residual1611836June 30, 2025932% over the limit
BOD, 5-day, 20 deg. C72826July 31, 2026454% over the limit
Nitrogen, ammonia total [as N]482412June 30, 2026109% over the limit
Nickel, total [as Ni]71612May 31, 20261,373% over the limit
Zinc, total [as Zn]21711December 31, 20121,136% over the limit
Chloroform21410December 31, 200429,725% over the limit
Cyanide, total [as CN]2168January 31, 20031,445% over the limit
Phenol2207March 31, 202619,900% over the limit
Copper, total [as Cu]284May 31, 201037,222% over the limit
Toxicity [acute], Ceriodaphnia dubia193June 30, 2016100% over the limit
Chromium, total [as Cr]282January 31, 20031,047% over the limit
Flow, in conduit or thru treatment plant032December 31, 20091,007% over the limit
Di[2-ethylhexyl] phthalate [DEHP]251December 31, 201055% over the limit
Hexachlorobenzene4120
1,3-Dichloropropene2100
1,2-Dichloroethane280
Chloroethane280
Lead, total [as Pb]260
Acenaphthylene260
Acenaphthene260
Methyl chloride [Chloromethane]260
Pyrene260
4-Nitrophenol260
Vinyl chloride260
Tetrachloroethene260
Carbon tetrachloride240
Toluene240
Benzene240
Acrylonitrile240
Benzo[b]fluoranthene240
Benzo[k]fluoranthene240
Benzo[a]pyrene240
Chrysene240
Diethyl phthalate240
Dimethyl phthalate240
Ethylbenzene240
Fluoranthene240
Hexachloroethane240
Methylene chloride240
Nitrobenzene240
Phenanthrene240
1,1-Dichloroethane240
1,1-Dichloroethylene240
1,1,1-Trichloroethane240
1,1,2-Trichloroethane240
Benzo[a]anthracene240
1,2-Dichlorobenzene240
1,2-Dichloropropane240
trans-1,2-Dichloroethylene240
1,2,4-Trichlorobenzene240
1,3-Dichlorobenzene240
1,4-Dichlorobenzene240
2-Chlorophenol240
2-Nitrophenol240
2,4-Dichlorophenol240
2,4-Dimethylphenol240
2,4-Dinitrotoluene240

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0000256.

Inspections

DateWhat EPA recordedAgency
March 10, 2026SamplingE
March 10, 2026SamplingE

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 IA0000256.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

What this page shows

This page covers the NPDES discharge permit IA0000256 held by ROQUETTE AMERICA, INC. in Keokuk, IA, which is listed as administratively continued and classed as a Major Discharger with a permit issued July 1, 2018 and expiring June 30, 2023. The record lists 16 pollutants under a numeric limit and 16 pollutants with an effluent exceedance, with the subwatershed given as Cedar Glen Creek-Mississippi River (HUC 070801041806).