Velarion Records
Follow this permit Velarion Records emails you this permit’s record, cited to the public filing, and tells you when the register changes it. Free.
We’ll email you a link to confirm. The continuous daily watch on every change is the paid alert. Unsubscribe any time.
Also free: The Pay Desk, the weekly executive pay briefing.

Clean Water Act discharge permit · NPDES IA0003441

GRAIN PROCESSING CORPORATION, Muscatine, IA: NPDES IA0003441 discharge permit, effluent exceedances, inspections, penalties

GRAIN PROCESSING CORPORATION holds NPDES permit IA0003441. EPA’s file records it issued November 1, 2022 and expiring October 31, 2027.

GRAIN PROCESSING CORPORATION, Muscatine, Iowa: Individual permit IA0003441; Effective; issued November 1, 2022, term to October 31, 2027, by STA; Wet Corn Milling and Starch Manufacturing.

  • Chlorine, total residual: 28 limits, 39 violations of any kind, 31 effluent exceedances, latest May 31, 2025, largest 1,686% over the limit.
  • pH: 15 limits, 14 violations of any kind, 14 effluent exceedances, latest April 30, 2026.
  • Temperature, water deg. fahrenheit: 24 limits, 5 violations of any kind, 3 effluent exceedances, latest August 31, 2016, largest 22% over the limit.
  • BOD, 5-day, 20 deg. C: 44 limits, 8 violations of any kind, 0 effluent exceedances.
  • Solids, total suspended: 44 limits, 8 violations of any kind, 0 effluent exceedances.
  • Toxicity [acute], Ceriodaphnia dubia: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Toxicity [acute], Pimephales promelas [Fathead Minnow]: 2 limits, 4 violations of any kind, 0 effluent exceedances.
  • Oxygen demand, chem. [high level] [COD]: 35 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.
  • Nitrogen, Kjeldahl, total [as N]: 5 limits, 0 violations of any kind, 0 effluent exceedances.
  • Chloride [as Cl]: 4 limits, 0 violations of any kind, 0 effluent exceedances.
  • Temperature, length of excursion: 1 limit, 0 violations of any kind, 0 effluent exceedances.

GRAIN PROCESSING CORPORATION among its neighbors

EPA’s permit file holds 2 discharge permits in the Fourth Slough-Mississippi River subwatershed (HUC 070801010605), IA0003441 among them. Its county holds 20, 6 of them major permits; IA0003441 is a major permit.

Other permits in the Fourth Slough-Mississippi River subwatershed (HUC 070801010605)

Identity

Facility as filedGRAIN PROCESSING CORPORATION
Permittee as filedGRAIN PROCESSING CORPORATION
NPDES IDIA0003441
Permit statusEffective
Permit typeIndividual permit
Discharger classMajor discharger
Facility typeNot a publicly owned treatment works
IssuedNovember 1, 2022
Expiration dateOctober 31, 2027
Issuing agencySTA
AddressMuscatine, IA 52761
Receiving water impaired303(D) Listed
SubwatershedFourth Slough-Mississippi River (HUC 070801010605)
NAICS311221 – Wet Corn Milling and Starch Manufacturing
SIC2046 – Wet Corn Milling
Other EPA IDs (FRS)RCRA handler IAD005269923; ICIS-AIR source IA0000001913900025

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
Chlorine, total residual283931May 31, 20251,686% over the limit
pH151414April 30, 2026
Temperature, water deg. fahrenheit2453August 31, 201622% over the limit
BOD, 5-day, 20 deg. C4480
Solids, total suspended4480
Toxicity [acute], Ceriodaphnia dubia240
Toxicity [acute], Pimephales promelas [Fathead Minnow]240
Oxygen demand, chem. [high level] [COD]3500
Nitrogen, total [as N]1000
Phosphorus, total [as P]1000
Nitrogen, Kjeldahl, total [as N]500
Chloride [as Cl]400
Temperature, length of excursion100

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0003441.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0003441.

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 IA0003441.

Watch this permit

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, IA0003441.

Start the watch

How often?
  • One permit holder — $99/month
  • One watershed — $2,990/year
  • One state — $4,990/year
  • The whole register — $18,000/year

How we handle your data → Privacy

Nearby on the register

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

What this page shows

This public-records page covers NPDES permit IA0003441 held by GRAIN PROCESSING CORPORATION in Muscatine, IA, shown as Effective, a Major Discharger with an individual permit, issued November 1, 2022 and expiring October 31, 2027. The page lists 13 for the discharger class, 3 pollutants under a numeric limit, and 3 pollutants with an effluent exceedance.