Midamerican Energy Company — NPDES permit IA0004308: limits, due date and EPA's record

Electric Services, major discharger, Council Bluffs, Iowa. NPDES permit IA0004308 expired Jul 31, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (39)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. fahrenheit	30-day average	≤ 110.5 deg F	Sep	003
Temperature, water deg. fahrenheit	30-day average	≤ 115.2 deg F	Aug	003
Temperature, water deg. fahrenheit	30-day average	≤ 111.7 deg F	Jun	003
Temperature, water deg. fahrenheit	30-day average	≤ 92.1 deg F	Apr	003
Temperature, water deg. fahrenheit	30-day average	≤ 103.1 deg F	May	003
Temperature, water deg. fahrenheit	30-day average	≤ 64.6 deg F	Dec	003
Temperature, water deg. fahrenheit	30-day average	≤ 66.4 deg F	Jan	003
Temperature, water deg. fahrenheit	30-day average	≤ 64.4 deg F	Feb	003
Temperature, water deg. fahrenheit	30-day average	≤ 75.9 deg F	Nov	003
Temperature, water deg. fahrenheit	30-day average	≤ 105.3 deg F	Jul	003
Temperature, water deg. fahrenheit	30-day average	≤ 70.5 deg F	Mar	003
Temperature, water deg. fahrenheit	30-day average	≤ 88.7 deg F	Oct	003
Temperature, water deg. fahrenheit	daily maximum	≤ 105.3 deg F	Jul	003
pH	daily minimum	≥ 6 SU	all year	004
pH	daily maximum	≤ 9 SU	all year	004
Solids, total suspended	daily maximum	≤ 50 mg/L	all year	004
pH	daily minimum	≥ 6 SU	all year	008
pH	daily maximum	≤ 9 SU	all year	008
Chromium, total [as Cr]	30-day average	≤ .2 mg/L	all year	008
Chromium, total [as Cr]	daily maximum	≤ .2 mg/L	all year	008
Zinc, total [as Zn]	30-day average	≤ 1 mg/L	all year	008
Zinc, total [as Zn]	daily maximum	≤ 1 mg/L	all year	008
Chlorine, free available	30-day average	≤ .2 mg/L	all year	008
Chlorine, free available	daily maximum	≤ .5 mg/L	all year	008
Chlorination duration	daily maximum	≤ 2 hr/d	all year	008
pH	daily minimum	≥ 6 SU	all year	009
pH	daily maximum	≤ 9 SU	all year	009
Solids, total suspended	30-day average	≤ 30 mg/L	all year	009
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	009
Oil & Grease	30-day average	≤ 15 mg/L	all year	009
Oil & Grease	daily maximum	≤ 20 mg/L	all year	009
Toxicity [acute], Ceriodaphnia dubia	daily maximum	≤ 1 N=0;Y=1	all year	009
Toxicity [acute], Pimephales promelas [Fathead Minnow]	daily maximum	≤ 1 N=0;Y=1	all year	009
pH	daily minimum	≥ 6 SU	all year	010
pH	daily maximum	≤ 9 SU	all year	010
Solids, total suspended	30-day average	≤ 30 mg/L	all year	010
Solids, total suspended	daily maximum	≤ 100 mg/L	all year	010
Oil & Grease	30-day average	≤ 15 mg/L	all year	010
Oil & Grease	daily maximum	≤ 20 mg/L	all year	010

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/IA0004308 · MCP: https://passage-data.com/mcp