MIDAMERICAN ENERGY COMPANY — NPDES permit IA0004308: limits, due date and EPA's record

NPDES permit IA0004308 · Major NON-POTW · administratively continued, expires 2026-07-31 · EPA's file as of 2026-09-19

This permit expired on 2026-07-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among IA permits in EPA's filings — check your permit).

Limits in force (39)

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