MUSCATINE POWER AND WATER — NPDES permit IA0001082: limits, due date and EPA's record

NPDES permit IA0001082 · Major NON-POTW · effective, expires 2030-08-31 · EPA's file as of 2026-09-19

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 (178)

Outfall	Parameter	Statistic	Limit	Months
001	Temperature, water deg. fahrenheit	30DA AVG	<= 117.5 deg F	Nov
001	Temperature, water deg. fahrenheit	30DA AVG	<= 136 deg F	Jul
001	Temperature, water deg. fahrenheit	30DA AVG	<= 166.5 deg F	May
001	Temperature, water deg. fahrenheit	30DA AVG	<= 132.8 deg F	Aug
001	Temperature, water deg. fahrenheit	30DA AVG	<= 94.3 deg F	Feb
001	Temperature, water deg. fahrenheit	30DA AVG	<= 128.2 deg F	Mar
001	Temperature, water deg. fahrenheit	30DA AVG	<= 179.8 deg F	Apr
001	Temperature, water deg. fahrenheit	30DA AVG	<= 157.9 deg F	Jun
001	Temperature, water deg. fahrenheit	30DA AVG	<= 122.8 deg F	Oct
001	Temperature, water deg. fahrenheit	30DA AVG	<= 90.7 deg F	Dec
001	Temperature, water deg. fahrenheit	30DA AVG	<= 86.9 deg F	Jan
001	Temperature, water deg. fahrenheit	30DA AVG	<= 134.2 deg F	Sep
001	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	Nov
001	Temperature, water deg. fahrenheit	DAILY MX	<= 136 deg F	Jul
001	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	May
001	Temperature, water deg. fahrenheit	DAILY MX	<= 132.8 deg F	Aug
001	Temperature, water deg. fahrenheit	DAILY MX	<= 144.9 deg F	Feb
001	Temperature, water deg. fahrenheit	DAILY MX	<= 186.6 deg F	Mar
001	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	Apr
001	Temperature, water deg. fahrenheit	DAILY MX	<= 195.9 deg F	Jun
001	Temperature, water deg. fahrenheit	DAILY MX	<= 197.9 deg F	Oct
001	Temperature, water deg. fahrenheit	DAILY MX	<= 155.5 deg F	Dec
001	Temperature, water deg. fahrenheit	DAILY MX	<= 144.9 deg F	Jan
001	Temperature, water deg. fahrenheit	DAILY MX	<= 169.4 deg F	Sep
001	Temperature, length of excursion	DAILY MX	<= 87.6 hr/12mo	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	<= 25.9 MGD	all year
001	Chlorine, total residual	DAILY MX	<= .2 mg/L	all year
001	Chlorine, total residual	DAILY MX	<= 15 lb/d	all year
001	Chlorination duration	DAILY MX	<= 2 hr/d	all year
002	Temperature, water deg. fahrenheit	30DA AVG	<= 134.2 deg F	Sep
002	Temperature, water deg. fahrenheit	30DA AVG	<= 117.5 deg F	Nov
002	Temperature, water deg. fahrenheit	30DA AVG	<= 132.8 deg F	Aug
002	Temperature, water deg. fahrenheit	30DA AVG	<= 136 deg F	Jul
002	Temperature, water deg. fahrenheit	30DA AVG	<= 179.8 deg F	Apr
002	Temperature, water deg. fahrenheit	30DA AVG	<= 128.2 deg F	Mar
002	Temperature, water deg. fahrenheit	30DA AVG	<= 90.7 deg F	Dec
002	Temperature, water deg. fahrenheit	30DA AVG	<= 94.3 deg F	Feb
002	Temperature, water deg. fahrenheit	30DA AVG	<= 166.5 deg F	May
002	Temperature, water deg. fahrenheit	30DA AVG	<= 122.8 deg F	Oct
002	Temperature, water deg. fahrenheit	30DA AVG	<= 157.9 deg F	Jun
002	Temperature, water deg. fahrenheit	30DA AVG	<= 86.9 deg F	Jan
002	Temperature, water deg. fahrenheit	DAILY MX	<= 169.4 deg F	Sep
002	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	Nov
002	Temperature, water deg. fahrenheit	DAILY MX	<= 132.8 deg F	Aug
002	Temperature, water deg. fahrenheit	DAILY MX	<= 136 deg F	Jul
002	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	Apr
002	Temperature, water deg. fahrenheit	DAILY MX	<= 186.6 deg F	Mar
002	Temperature, water deg. fahrenheit	DAILY MX	<= 155.5 deg F	Dec
002	Temperature, water deg. fahrenheit	DAILY MX	<= 144.9 deg F	Feb
002	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	May
002	Temperature, water deg. fahrenheit	DAILY MX	<= 197.9 deg F	Oct
002	Temperature, water deg. fahrenheit	DAILY MX	<= 195.9 deg F	Jun
002	Temperature, water deg. fahrenheit	DAILY MX	<= 144.9 deg F	Jan
002	pH	DAILY MN	>= 6 SU	all year
002	pH	DAILY MX	<= 9 SU	all year
002	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 100 mg/L	all year
002	Oil & Grease	30DA AVG	<= 15 mg/L	all year
002	Oil & Grease	DAILY MX	<= 20 mg/L	all year
002	Temperature, length of excursion	DAILY MX	<= 87.6 hr/12mo	all year
002	Chlorine, total residual	30DA AVG	<= .995 mg/L	all year
002	Chlorine, total residual	DAILY MX	<= .995 mg/L	all year
002	Chlorine, total residual	30DA AVG	<= 13.292 lb/d	all year
002	Chlorine, total residual	DAILY MX	<= 13.292 lb/d	all year
003	Temperature, water deg. fahrenheit	30DA AVG	<= 117.5 deg F	Nov
003	Temperature, water deg. fahrenheit	30DA AVG	<= 157.9 deg F	Jun
003	Temperature, water deg. fahrenheit	30DA AVG	<= 90.7 deg F	Dec
003	Temperature, water deg. fahrenheit	30DA AVG	<= 132.8 deg F	Aug
003	Temperature, water deg. fahrenheit	30DA AVG	<= 86.9 deg F	Jan
003	Temperature, water deg. fahrenheit	30DA AVG	<= 179.8 deg F	Apr
003	Temperature, water deg. fahrenheit	30DA AVG	<= 134.2 deg F	Sep
003	Temperature, water deg. fahrenheit	30DA AVG	<= 136 deg F	Jul
003	Temperature, water deg. fahrenheit	30DA AVG	<= 166.5 deg F	May
003	Temperature, water deg. fahrenheit	30DA AVG	<= 94.3 deg F	Feb
003	Temperature, water deg. fahrenheit	30DA AVG	<= 122.8 deg F	Oct
003	Temperature, water deg. fahrenheit	30DA AVG	<= 128.2 deg F	Mar
003	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	Nov
003	Temperature, water deg. fahrenheit	DAILY MX	<= 195.9 deg F	Jun
003	Temperature, water deg. fahrenheit	DAILY MX	<= 155.5 deg F	Dec
003	Temperature, water deg. fahrenheit	DAILY MX	<= 132.8 deg F	Aug
003	Temperature, water deg. fahrenheit	DAILY MX	<= 144.9 deg F	Jan
003	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	Apr
003	Temperature, water deg. fahrenheit	DAILY MX	<= 169.4 deg F	Sep
003	Temperature, water deg. fahrenheit	DAILY MX	<= 136 deg F	Jul
003	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	May
003	Temperature, water deg. fahrenheit	DAILY MX	<= 144.9 deg F	Feb
003	Temperature, water deg. fahrenheit	DAILY MX	<= 197.9 deg F	Oct
003	Temperature, water deg. fahrenheit	DAILY MX	<= 186.6 deg F	Mar
003	Temperature, length of excursion	DAILY MX	<= 87.6 hr/12mo	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	<= 13.1 MGD	all year
003	Chlorine, total residual	DAILY MX	<= .2 mg/L	all year
003	Chlorine, total residual	DAILY MX	<= 7.6 lb/d	all year
003	Chlorination duration	DAILY MX	<= 2 hr/d	all year
004	Temperature, water deg. fahrenheit	30DA AVG	<= 128.2 deg F	Mar
004	Temperature, water deg. fahrenheit	30DA AVG	<= 90.7 deg F	Dec
004	Temperature, water deg. fahrenheit	30DA AVG	<= 94.3 deg F	Feb
004	Temperature, water deg. fahrenheit	30DA AVG	<= 132.8 deg F	Aug
004	Temperature, water deg. fahrenheit	30DA AVG	<= 166.5 deg F	May
004	Temperature, water deg. fahrenheit	30DA AVG	<= 86.9 deg F	Jan
004	Temperature, water deg. fahrenheit	30DA AVG	<= 157.9 deg F	Jun
004	Temperature, water deg. fahrenheit	30DA AVG	<= 117.5 deg F	Nov
004	Temperature, water deg. fahrenheit	30DA AVG	<= 136 deg F	Jul
004	Temperature, water deg. fahrenheit	30DA AVG	<= 179.8 deg F	Apr
004	Temperature, water deg. fahrenheit	30DA AVG	<= 122.8 deg F	Oct
004	Temperature, water deg. fahrenheit	30DA AVG	<= 134.2 deg F	Sep
004	Temperature, water deg. fahrenheit	DAILY MX	<= 186.6 deg F	Mar
004	Temperature, water deg. fahrenheit	DAILY MX	<= 155.5 deg F	Dec
004	Temperature, water deg. fahrenheit	DAILY MX	<= 144.9 deg F	Feb
004	Temperature, water deg. fahrenheit	DAILY MX	<= 132.8 deg F	Aug
004	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	May
004	Temperature, water deg. fahrenheit	DAILY MX	<= 144.9 deg F	Jan
004	Temperature, water deg. fahrenheit	DAILY MX	<= 195.9 deg F	Jun
004	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	Nov
004	Temperature, water deg. fahrenheit	DAILY MX	<= 136 deg F	Jul
004	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	Apr
004	Temperature, water deg. fahrenheit	DAILY MX	<= 197.9 deg F	Oct
004	Temperature, water deg. fahrenheit	DAILY MX	<= 169.4 deg F	Sep
004	pH	DAILY MN	>= 6 SU	all year
004	pH	DAILY MX	<= 9 SU	all year
004	Solids, total suspended	30DA AVG	<= 30 mg/L	all year
004	Solids, total suspended	DAILY MX	<= 100 mg/L	all year
004	Oil & Grease	30DA AVG	<= 15 mg/L	all year
004	Oil & Grease	DAILY MX	<= 20 mg/L	all year
004	Oil & Grease	30DA AVG	<= 7.4 lb/d	all year
004	Oil & Grease	DAILY MX	<= 9.8 lb/d	all year
004	Temperature, length of excursion	DAILY MX	<= 87.6 hr/12mo	all year
004	Chlorine, total residual	30DA AVG	<= .325 mg/L	all year
004	Chlorine, total residual	DAILY MX	<= .325 mg/L	all year
004	Chlorine, total residual	30DA AVG	<= .535 lb/d	all year
004	Chlorine, total residual	DAILY MX	<= .535 lb/d	all year
006	Temperature, water deg. fahrenheit	30DA AVG	<= 90.7 deg F	Dec
006	Temperature, water deg. fahrenheit	30DA AVG	<= 128.2 deg F	Mar
006	Temperature, water deg. fahrenheit	30DA AVG	<= 179.8 deg F	Apr
006	Temperature, water deg. fahrenheit	30DA AVG	<= 86.9 deg F	Jan
006	Temperature, water deg. fahrenheit	30DA AVG	<= 122.8 deg F	Oct
006	Temperature, water deg. fahrenheit	30DA AVG	<= 94.3 deg F	Feb
006	Temperature, water deg. fahrenheit	30DA AVG	<= 117.5 deg F	Nov
006	Temperature, water deg. fahrenheit	30DA AVG	<= 157.9 deg F	Jun
006	Temperature, water deg. fahrenheit	30DA AVG	<= 134.2 deg F	Sep
006	Temperature, water deg. fahrenheit	30DA AVG	<= 132.8 deg F	Aug
006	Temperature, water deg. fahrenheit	30DA AVG	<= 136 deg F	Jul
006	Temperature, water deg. fahrenheit	30DA AVG	<= 166.5 deg F	May
006	Temperature, water deg. fahrenheit	DAILY MX	<= 155.5 deg F	Dec
006	Temperature, water deg. fahrenheit	DAILY MX	<= 186.6 deg F	Mar
006	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	Apr
006	Temperature, water deg. fahrenheit	DAILY MX	<= 144.9 deg F	Jan
006	Temperature, water deg. fahrenheit	DAILY MX	<= 197.9 deg F	Oct
006	Temperature, water deg. fahrenheit	DAILY MX	<= 144.9 deg F	Feb
006	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	Nov
006	Temperature, water deg. fahrenheit	DAILY MX	<= 195.9 deg F	Jun
006	Temperature, water deg. fahrenheit	DAILY MX	<= 169.4 deg F	Sep
006	Temperature, water deg. fahrenheit	DAILY MX	<= 132.8 deg F	Aug
006	Temperature, water deg. fahrenheit	DAILY MX	<= 136 deg F	Jul
006	Temperature, water deg. fahrenheit	DAILY MX	<= 212 deg F	May
006	Temperature, length of excursion	DAILY MX	<= 87.6 hr/12mo	all year
006	Chlorine, total residual	DAILY MX	<= .2 mg/L	all year
006	Chlorine, total residual	DAILY MX	<= 19 lb/d	all year
006	Chlorination duration	DAILY MX	<= 2 hr/d	all year
106	pH	DAILY MN	>= 6 SU	all year
106	pH	DAILY MX	<= 9 SU	all year
106	Solids, total suspended	30DA AVG	<= 212 lb/d	all year
106	Solids, total suspended	DAILY MX	<= 717 lb/d	all year
106	Oil & Grease	30DA AVG	<= 107 lb/d	all year
106	Oil & Grease	DAILY MX	<= 143 lb/d	all year
106	Copper, total [as Cu]	30DA AVG	<= .7167 mg/L	all year
106	Copper, total [as Cu]	DAILY MX	<= .7167 mg/L	all year
106	Copper, total [as Cu]	30DA AVG	<= 7.99 lb/d	all year
106	Copper, total [as Cu]	DAILY MX	<= 7.99 lb/d	all year
106	Toxicity [acute], Ceriodaphnia dubia	DAILY MX	<= 1 N=0;Y=1	all year
106	Toxicity [acute], Pimephales promelas [Fathead Minnow]	DAILY MX	<= 1 N=0;Y=1	all year
106	Mercury, total [as Hg]	30DA AVG	<= .04389 mg/L	all year
106	Mercury, total [as Hg]	DAILY MX	<= .04389 mg/L	all year
106	Mercury, total [as Hg]	30DA AVG	<= .4892 lb/d	all year
106	Mercury, total [as Hg]	DAILY MX	<= .4892 lb/d	all year
117	Copper, total [as Cu]	30DA AVG	<= 1 mg/L	all year
117	Copper, total [as Cu]	DAILY MX	<= 1 mg/L	all year
117	Iron, total [as Fe]	30DA AVG	<= 1 mg/L	all year
117	Iron, total [as Fe]	DAILY MX	<= 1 mg/L	all year