Koch Fertilizer FT. Dodge, LLC — NPDES permit IA0000302: limits, due date and EPA's record

Nitrogenous Fertilizers, Duncombe, Iowa. NPDES permit IA0000302, in force until Sep 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (115)

Parameter	Statistic	Limit	Months	Outfall
pH	daily minimum	≥ 6 SU	all year	001
pH	daily maximum	≤ 9 SU	all year	001
Nitrogen, organic total [as N]	30-day average	≤ 275 lb/d	all year	001
Nitrogen, organic total [as N]	daily maximum	≤ 515 lb/d	all year	001
Nitrogen, ammonia total [as N]	30-day average	≤ 5 mg/L	Oct	001
Nitrogen, ammonia total [as N]	30-day average	≤ 7 mg/L	Jun	001
Nitrogen, ammonia total [as N]	30-day average	≤ 5.5 mg/L	Mar	001
Nitrogen, ammonia total [as N]	30-day average	≤ 6.5 mg/L	Sep	001
Nitrogen, ammonia total [as N]	30-day average	≤ 7.1 mg/L	Jan	001
Nitrogen, ammonia total [as N]	30-day average	≤ 7.2 mg/L	Feb	001
Nitrogen, ammonia total [as N]	30-day average	≤ 5.5 mg/L	May	001
Nitrogen, ammonia total [as N]	30-day average	≤ 5.4 mg/L	Dec	001
Nitrogen, ammonia total [as N]	30-day average	≤ 7.1 mg/L	Jul	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4.5 mg/L	Apr	001
Nitrogen, ammonia total [as N]	30-day average	≤ 4.9 mg/L	Nov	001
Nitrogen, ammonia total [as N]	30-day average	≤ 8 mg/L	Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 5 mg/L	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7 mg/L	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 5.5 mg/L	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 6.5 mg/L	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.1 mg/L	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.2 mg/L	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 5.5 mg/L	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 5.4 mg/L	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.1 mg/L	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 4.5 mg/L	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 4.9 mg/L	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8 mg/L	Aug	001
Nitrogen, ammonia total [as N]	30-day average	≤ 68.2 lb/d	Oct	001
Nitrogen, ammonia total [as N]	30-day average	≤ 73.2 lb/d	Jun	001
Nitrogen, ammonia total [as N]	30-day average	≤ 73.6 lb/d	Mar	001
Nitrogen, ammonia total [as N]	30-day average	≤ 82.3 lb/d	Sep	001
Nitrogen, ammonia total [as N]	30-day average	≤ 105.9 lb/d	Jan	001
Nitrogen, ammonia total [as N]	30-day average	≤ 104.9 lb/d	Feb	001
Nitrogen, ammonia total [as N]	30-day average	≤ 61.6 lb/d	May	001
Nitrogen, ammonia total [as N]	30-day average	≤ 67.8 lb/d	Dec	001
Nitrogen, ammonia total [as N]	30-day average	≤ 100.9 lb/d	Jul	001
Nitrogen, ammonia total [as N]	30-day average	≤ 54.3 lb/d	Apr	001
Nitrogen, ammonia total [as N]	30-day average	≤ 60.8 lb/d	Nov	001
Nitrogen, ammonia total [as N]	30-day average	≤ 89.8 lb/d	Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 68.2 lb/d	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 73.2 lb/d	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 73.6 lb/d	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 82.3 lb/d	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 105.9 lb/d	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 104.9 lb/d	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 61.6 lb/d	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 67.8 lb/d	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 100.9 lb/d	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 54.3 lb/d	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 60.8 lb/d	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 89.8 lb/d	Aug	001
Nitrogen, nitrate total [as N]	30-day average	≤ 142 lb/d	all year	001
Nitrogen, nitrate total [as N]	daily maximum	≤ 233 lb/d	all year	001
pH	daily minimum	≥ 6 SU	all year	002
pH	daily maximum	≤ 9 SU	all year	002
Solids, total suspended	30-day average	≤ 30 mg/L	all year	002
Solids, total suspended	7-day average	≤ 45 mg/L	all year	002
Nitrogen, ammonia total [as N]	30-day average	≤ 4.6 mg/L	Sep	002
Nitrogen, ammonia total [as N]	30-day average	≤ 12.6 mg/L	Jun	002
Nitrogen, ammonia total [as N]	30-day average	≤ 7 mg/L	Feb	002
Nitrogen, ammonia total [as N]	30-day average	≤ 5 mg/L	Aug	002
Nitrogen, ammonia total [as N]	30-day average	≤ 9.5 mg/L	Apr	002
Nitrogen, ammonia total [as N]	30-day average	≤ 4.4 mg/L	Oct	002
Nitrogen, ammonia total [as N]	30-day average	≤ 5.3 mg/L	Jul	002
Nitrogen, ammonia total [as N]	30-day average	≤ 4.9 mg/L	Dec	002
Nitrogen, ammonia total [as N]	30-day average	≤ 10.3 mg/L	Jan	002
Nitrogen, ammonia total [as N]	30-day average	≤ 4.3 mg/L	Nov	002
Nitrogen, ammonia total [as N]	30-day average	≤ 11.1 mg/L	May	002
Nitrogen, ammonia total [as N]	30-day average	≤ 4.6 mg/L	Mar	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 4.6 mg/L	Sep	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 12.6 mg/L	Jun	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 7 mg/L	Feb	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 5.7 mg/L	Aug	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 9.5 mg/L	Apr	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 4.4 mg/L	Oct	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 5.7 mg/L	Jul	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 4.9 mg/L	Dec	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.3 mg/L	Jan	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 4.3 mg/L	Nov	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 11.1 mg/L	May	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 4.6 mg/L	Mar	002
Nitrogen, ammonia total [as N]	30-day average	≤ 26.1 lb/d	Sep	002
Nitrogen, ammonia total [as N]	30-day average	≤ 70.8 lb/d	Jun	002
Nitrogen, ammonia total [as N]	30-day average	≤ 39.5 lb/d	Feb	002
Nitrogen, ammonia total [as N]	30-day average	≤ 28.2 lb/d	Aug	002
Nitrogen, ammonia total [as N]	30-day average	≤ 53.4 lb/d	Apr	002
Nitrogen, ammonia total [as N]	30-day average	≤ 24.6 lb/d	Oct	002
Nitrogen, ammonia total [as N]	30-day average	≤ 29.7 lb/d	Jul	002
Nitrogen, ammonia total [as N]	30-day average	≤ 27.3 lb/d	Dec	002
Nitrogen, ammonia total [as N]	30-day average	≤ 58.1 lb/d	Jan	002
Nitrogen, ammonia total [as N]	30-day average	≤ 24.4 lb/d	Nov	002
Nitrogen, ammonia total [as N]	30-day average	≤ 62.4 lb/d	May	002
Nitrogen, ammonia total [as N]	30-day average	≤ 25.7 lb/d	Mar	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 26.1 lb/d	Sep	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 70.8 lb/d	Jun	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 39.5 lb/d	Feb	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 32.1 lb/d	Aug	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 53.4 lb/d	Apr	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 24.6 lb/d	Oct	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 32.1 lb/d	Jul	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 27.3 lb/d	Dec	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 58.1 lb/d	Jan	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 24.4 lb/d	Nov	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 62.4 lb/d	May	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 25.7 lb/d	Mar	002
Copper, total [as Cu]	30-day average	≤ .047 mg/L	all year	002
Copper, total [as Cu]	daily maximum	≤ .047 mg/L	all year	002
Copper, total [as Cu]	30-day average	≤ .208 lb/d	all year	002
Copper, total [as Cu]	daily maximum	≤ .208 lb/d	all year	002
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 25 mg/L	all year	002
BOD, carbonaceous [5 day, 20 C]	7-day average	≤ 40 mg/L	all year	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.1 mg/L	all year	003
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.1 mg/L	all year	004
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.1 mg/L	all year	005

New limits from Oct 1, 2029

Parameter	New limit	From	New or tighter	Median, last 12 months	× new limit
Copper, total [as Cu], daily maximum outfall 004	0.3025 mg/L	Oct 1, 2029	new	—	—
Zinc, total [as Zn], daily maximum outfall 004	6.06 mg/L	Oct 1, 2029	new	—	—
Iron, total [as Fe], 30-day average outfall 001	16.2 lb/d	Sep 1, 2031	new	—	—
Iron, total [as Fe], 30-day average outfall 001	1.76 mg/L	Sep 1, 2031	new	—	—
Iron, total [as Fe], daily maximum outfall 001	16.2 lb/d	Sep 1, 2031	new	—	—
Iron, total [as Fe], daily maximum outfall 001	1.76 mg/L	Sep 1, 2031	new	—	—

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/IA0000302 · MCP: https://passage-data.com/mcp