Archer Daniels Midland Company — NPDES permit IA0072958: limits, due date and EPA's record

Soybean Oil Mills, Des Moines, Iowa. NPDES permit IA0072958 expired May 31, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (85)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. fahrenheit	30-day average	≤ 89.6 deg F	Oct	001
Temperature, water deg. fahrenheit	30-day average	≤ 80.4 deg F	Feb	001
Temperature, water deg. fahrenheit	30-day average	≤ 70.9 deg F	Jan	001
Temperature, water deg. fahrenheit	30-day average	≤ 89.6 deg F	Sep	001
Temperature, water deg. fahrenheit	30-day average	≤ 82.4 deg F	Apr	001
Temperature, water deg. fahrenheit	30-day average	≤ 84.9 deg F	May	001
Temperature, water deg. fahrenheit	30-day average	≤ 89.6 deg F	Jun	001
Temperature, water deg. fahrenheit	30-day average	≤ 89.6 deg F	Aug	001
Temperature, water deg. fahrenheit	30-day average	≤ 80.6 deg F	Nov	001
Temperature, water deg. fahrenheit	30-day average	≤ 89.6 deg F	Jul	001
Temperature, water deg. fahrenheit	30-day average	≤ 71.6 deg F	Dec	001
Temperature, water deg. fahrenheit	30-day average	≤ 87.4 deg F	Mar	001
Temperature, water deg. fahrenheit	daily maximum	≤ 89.6 deg F	Oct	001
Temperature, water deg. fahrenheit	daily maximum	≤ 89.6 deg F	Feb	001
Temperature, water deg. fahrenheit	daily maximum	≤ 89.6 deg F	Jan	001
Temperature, water deg. fahrenheit	daily maximum	≤ 89.6 deg F	Sep	001
Temperature, water deg. fahrenheit	daily maximum	≤ 89.6 deg F	Apr	001
Temperature, water deg. fahrenheit	daily maximum	≤ 89.6 deg F	May	001
Temperature, water deg. fahrenheit	daily maximum	≤ 89.6 deg F	Jun	001
Temperature, water deg. fahrenheit	daily maximum	≤ 89.6 deg F	Aug	001
Temperature, water deg. fahrenheit	daily maximum	≤ 89.6 deg F	Nov	001
Temperature, water deg. fahrenheit	daily maximum	≤ 89.6 deg F	Jul	001
Temperature, water deg. fahrenheit	daily maximum	≤ 89.6 deg F	Dec	001
Temperature, water deg. fahrenheit	daily maximum	≤ 89.6 deg F	Mar	001
Oxygen, dissolved [DO]	daily minimum	≥ 5 mg/L	all year	001
pH	daily minimum	≥ 6.5 SU	all year	001
pH	daily maximum	≤ 9 SU	all year	001
Chloride [as Cl]	30-day average	≤ 389 mg/L	all year	001
Chloride [as Cl]	daily maximum	≤ 629 mg/L	all year	001
Chloride [as Cl]	30-day average	≤ 323 lb/d	all year	001
Chloride [as Cl]	daily maximum	≤ 522 lb/d	all year	001
Chlorine, total residual	30-day average	≤ .011 mg/L	all year	001
Chlorine, total residual	daily maximum	≤ .019 mg/L	all year	001
Chlorine, total residual	30-day average	≤ .009 lb/d	all year	001
Chlorine, total residual	daily maximum	≤ .016 lb/d	all year	001
pH	daily minimum	≥ 6.5 SU	all year	002
pH	daily maximum	≤ 9 SU	all year	002
Nitrogen, ammonia total [as N]	30-day average	≤ 1.1 mg/L	May	002
Nitrogen, ammonia total [as N]	30-day average	≤ 1.6 mg/L	Apr	002
Nitrogen, ammonia total [as N]	30-day average	≤ .5 mg/L	Aug	002
Nitrogen, ammonia total [as N]	30-day average	≤ 1.1 mg/L	Sep	002
Nitrogen, ammonia total [as N]	30-day average	≤ 1.1 mg/L	Oct	002
Nitrogen, ammonia total [as N]	30-day average	≤ 3 mg/L	Nov	002
Nitrogen, ammonia total [as N]	30-day average	≤ 3.1 mg/L	Dec	002
Nitrogen, ammonia total [as N]	30-day average	≤ .5 mg/L	Jul	002
Nitrogen, ammonia total [as N]	30-day average	≤ .7 mg/L	Jun	002
Nitrogen, ammonia total [as N]	30-day average	≤ 3.1 mg/L	Jan	002
Nitrogen, ammonia total [as N]	30-day average	≤ 4.8 mg/L	Feb	002
Nitrogen, ammonia total [as N]	30-day average	≤ 2.6 mg/L	Mar	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 16.8 mg/L	May	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 17 mg/L	Apr	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 18.9 mg/L	Aug	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 18.9 mg/L	Sep	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 17.5 mg/L	Oct	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 16 mg/L	Nov	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 17.1 mg/L	Dec	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 20.4 mg/L	Jul	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 16.4 mg/L	Jun	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 16.1 mg/L	Jan	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 15 mg/L	Feb	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 15.6 mg/L	Mar	002
Nitrogen, ammonia total [as N]	30-day average	≤ 7.5 lb/d	May	002
Nitrogen, ammonia total [as N]	30-day average	≤ 11.2 lb/d	Apr	002
Nitrogen, ammonia total [as N]	30-day average	≤ 3.5 lb/d	Aug	002
Nitrogen, ammonia total [as N]	30-day average	≤ 7.7 lb/d	Sep	002
Nitrogen, ammonia total [as N]	30-day average	≤ 7.5 lb/d	Oct	002
Nitrogen, ammonia total [as N]	30-day average	≤ 20.3 lb/d	Nov	002
Nitrogen, ammonia total [as N]	30-day average	≤ 21.2 lb/d	Dec	002
Nitrogen, ammonia total [as N]	30-day average	≤ 3.3 lb/d	Jul	002
Nitrogen, ammonia total [as N]	30-day average	≤ 4.8 lb/d	Jun	002
Nitrogen, ammonia total [as N]	30-day average	≤ 21 lb/d	Jan	002
Nitrogen, ammonia total [as N]	30-day average	≤ 32.7 lb/d	Feb	002
Nitrogen, ammonia total [as N]	30-day average	≤ 17.6 lb/d	Mar	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 114.6 lb/d	May	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 115.8 lb/d	Apr	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 128.8 lb/d	Aug	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 128.5 lb/d	Sep	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 119.3 lb/d	Oct	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 109 lb/d	Nov	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 116.3 lb/d	Dec	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 139.1 lb/d	Jul	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 111.7 lb/d	Jun	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 109.7 lb/d	Jan	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 102.1 lb/d	Feb	002
Nitrogen, ammonia total [as N]	daily maximum	≤ 106.5 lb/d	Mar	002

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/IA0072958 · MCP: https://passage-data.com/mcp