Clean Water Act discharge permit · NPDES IA0000302

KOCH FERTILIZER FT. DODGE, LLC, Duncombe, IA: NPDES IA0000302 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
15Pollutants under a numeric limit
7Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

KOCH FERTILIZER FT. DODGE, LLC holds NPDES permit IA0000302. EPA’s file records it issued August 1, 2019 and expiring July 31, 2024.

KOCH FERTILIZER FT. DODGE, LLC, Duncombe, Iowa: Individual permit IA0000302; Effective; issued August 1, 2019, term to July 31, 2024, by STA; Nitrogenous Fertilizer Manufacturing.

Nitrogen, ammonia total [as N]: 65 limits, 42 violations of any kind, 18 effluent exceedances, latest January 31, 2025, largest 59% over the limit.
pH: 4 limits, 37 violations of any kind, 11 effluent exceedances, latest April 30, 2025.
Nitrogen, nitrate total [as N]: 51 limits, 30 violations of any kind, 6 effluent exceedances, latest April 30, 2006, largest 39% over the limit.
Nitrogen, organic total [as N]: 48 limits, 29 violations of any kind, 5 effluent exceedances, latest May 31, 2021, largest 43% over the limit.
Solids, total suspended: 19 limits, 19 violations of any kind, 5 effluent exceedances, latest October 31, 2020, largest 293% over the limit.
BOD, 5-day, 20 deg. C: 0 limits, 3 violations of any kind, 1 effluent exceedance, latest April 30, 2001, largest 12% over the limit.
Flow, in conduit or thru treatment plant: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest May 31, 2003, largest 10% over the limit.
BOD, carbonaceous [5 day, 20 C]: 5 limits, 12 violations of any kind, 0 effluent exceedances.
Nitrogen, Kjeldahl, total [as N]: 9 limits, 0 violations of any kind, 0 effluent exceedances.
Oxygen demand, chem. [high level] [COD]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Nitrite + Nitrate total [as N]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Phosphorus, total [as P]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Copper, total [as Cu]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Zinc, total [as Zn]: 3 limits, 0 violations of any kind, 0 effluent exceedances.
E. coli: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Depth of pond or reservoir in feet: 3 limits, 0 violations of any kind, 0 effluent exceedances.
Annual Nitrate Nitrogen Discharged: 1 limit, 0 violations of any kind, 0 effluent exceedances.

KOCH FERTILIZER FT. DODGE, LLC among its neighbors

EPA’s permit file holds 2 discharge permits in the Ditch No 4 subwatershed (HUC 071000040501), IA0000302 among them. Its county holds 22, 1 of them major permits; IA0000302 is a minor permit.

Other permits in the Ditch No 4 subwatershed (HUC 071000040501)

DUNCOMBE CITY OF STP, Duncombe: IA0027413, minor permit, permit term to February 28, 2026

Identity

Facility as filed	KOCH FERTILIZER FT. DODGE, LLC
Permittee as filed	KOCH FERTILIZER FT. DODGE, LLC
NPDES ID	IA0000302
Permit status	Effective
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	August 1, 2019
Expiration date	July 31, 2024
Issuing agency	STA
Address	Duncombe, IA 50532
Receiving water impaired	303(D) Listed
Subwatershed	Ditch No 4 (HUC 071000040501)
NAICS	325311 – Nitrogenous Fertilizer Manufacturing
SIC	2873 – Nitrogenous Fertilizers
Other EPA IDs (FRS)	ICIS-AIR source IA0000001918700040

Effluent limits and exceedances

17Pollutants on file
15Under a numeric limit
8With a violation of any kind
7With an effluent exceedance

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 measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Nitrogen, ammonia total [as N]	65	42	18	January 31, 2025	59% over the limit
pH	4	37	11	April 30, 2025
Nitrogen, nitrate total [as N]	51	30	6	April 30, 2006	39% over the limit
Nitrogen, organic total [as N]	48	29	5	May 31, 2021	43% over the limit
Solids, total suspended	19	19	5	October 31, 2020	293% over the limit
BOD, 5-day, 20 deg. C	0	3	1	April 30, 2001	12% over the limit
Flow, in conduit or thru treatment plant	0	1	1	May 31, 2003	10% over the limit
BOD, carbonaceous [5 day, 20 C]	5	12	0
Nitrogen, Kjeldahl, total [as N]	9	0	0
Oxygen demand, chem. [high level] [COD]	3	0	0
Nitrite + Nitrate total [as N]	3	0	0
Phosphorus, total [as P]	3	0	0
Copper, total [as Cu]	3	0	0
Zinc, total [as Zn]	3	0	0
E. coli	3	0	0
Depth of pond or reservoir in feet	3	0	0
Annual Nitrate Nitrogen Discharged	1	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES IA0000302.

Inspections

EPA’s inspection file holds no inspection for NPDES IA0000302.

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 IA0000302.

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

This public-records page covers Clean Water Act NPDES permit IA0000302 for KOCH FERTILIZER FT. DODGE, LLC in Duncombe, IA, with a status of Effective and a Minor Discharger class. The page lists 15 pollutants under a numeric limit and 7 pollutants with an effluent exceedance, with the permit's status and dates as EPA's permit file stood when Velarion loaded it on October 14, 2026.