MONONGAHELA POWER COMPANY — NPDES permit WV0004731: limits, due date and EPA's record

NPDES permit WV0004731 · Major NON-POTW · administratively continued, expires 2026-05-13 · EPA's file as of 2026-09-19

This permit expired on 2026-05-13 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

Last period with anything received: 2026-07-31. Most often over: Temperature, water deg. fahrenheit (8).

Reporting

Reports are due about 25 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (243)

Outfall	Parameter	Statistic	Limit	Months
002	Temperature, water deg. fahrenheit	MO AVG	<= 99.4 deg F	Jun
002	Temperature, water deg. fahrenheit	MO AVG	report only	May
002	Temperature, water deg. fahrenheit	MO AVG	<= 96.2 deg F	Sep
002	Temperature, water deg. fahrenheit	MO AVG	report only	Dec
002	Temperature, water deg. fahrenheit	MO AVG	report only	Jan
002	Temperature, water deg. fahrenheit	MO AVG	report only	Nov
002	Temperature, water deg. fahrenheit	MO AVG	report only	Mar
002	Temperature, water deg. fahrenheit	MO AVG	report only	Feb
002	Temperature, water deg. fahrenheit	MO AVG	<= 88.9 deg F	Aug
002	Temperature, water deg. fahrenheit	MO AVG	<= 95.9 deg F	Apr
002	Temperature, water deg. fahrenheit	MO AVG	<= 88.1 deg F	Jul
002	Temperature, water deg. fahrenheit	MO AVG	report only	Oct
002	Temperature, water deg. fahrenheit	DAILY MX	<= 115 deg F	Jun
002	Temperature, water deg. fahrenheit	DAILY MX	report only	May
002	Temperature, water deg. fahrenheit	DAILY MX	<= 111 deg F	Sep
002	Temperature, water deg. fahrenheit	DAILY MX	report only	Dec
002	Temperature, water deg. fahrenheit	DAILY MX	report only	Jan
002	Temperature, water deg. fahrenheit	DAILY MX	report only	Nov
002	Temperature, water deg. fahrenheit	DAILY MX	report only	Mar
002	Temperature, water deg. fahrenheit	DAILY MX	report only	Feb
002	Temperature, water deg. fahrenheit	DAILY MX	<= 103 deg F	Aug
002	Temperature, water deg. fahrenheit	DAILY MX	<= 111 deg F	Apr
002	Temperature, water deg. fahrenheit	DAILY MX	<= 102 deg F	Jul
002	Temperature, water deg. fahrenheit	DAILY MX	report only	Oct
002	Temperature, water deg. fahrenheit	MO AVG	report only	all year
002	Temperature, water deg. fahrenheit	DAILY MX	<= 15 deg F	all year
002	Temperature, water deg. fahrenheit	MO AVG	report only	all year
002	Temperature, water deg. fahrenheit	DAILY MX	report only	all year
002	pH	INST MIN	>= 6 SU	all year
002	pH	INST MAX	<= 9 SU	all year
002	Solids, total suspended	MO AVG	<= 30 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 99.4 mg/L	all year
002	Solids, total suspended	MO AVG	report only	all year
002	Solids, total suspended	DAILY MX	report only	all year
002	Oil and grease, hexane extr method	MO AVG	<= 14.6 mg/L	all year
002	Oil and grease, hexane extr method	DAILY MX	<= 19.7 mg/L	all year
002	Oil and grease, hexane extr method	MO AVG	report only	all year
002	Oil and grease, hexane extr method	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	MO AVG	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
002	Nitrogen, nitrite total [as N]	MO AVG	report only	all year
002	Nitrogen, nitrite total [as N]	DAILY MX	report only	all year
002	Nitrogen, nitrate total [as N]	MO AVG	report only	all year
002	Nitrogen, nitrate total [as N]	DAILY MX	report only	all year
002	Chloride [as Cl]	MO AVG	report only	all year
002	Chloride [as Cl]	DAILY MX	report only	all year
002	Arsenic, total recoverable	MO AVG	report only	all year
002	Arsenic, total recoverable	DAILY MX	report only	all year
002	Iron, total recoverable	MO AVG	<= 3.9 mg/L	all year
002	Iron, total recoverable	DAILY MX	<= 9.6 mg/L	all year
002	Selenium, total recoverable	MO AVG	<= .02 mg/L	all year
002	Selenium, total recoverable	DAILY MX	<= .034 mg/L	all year
002	Beryllium, total recoverable [as Be]	MO AVG	report only	all year
002	Beryllium, total recoverable [as Be]	DAILY MX	report only	all year
002	Thallium, total [as Tl]	MO AVG	report only	all year
002	Thallium, total [as Tl]	DAILY MX	report only	all year
002	Nickel, total recoverable	MO AVG	report only	all year
002	Nickel, total recoverable	DAILY MX	report only	all year
002	Zinc, total recoverable	MO AVG	report only	all year
002	Zinc, total recoverable	DAILY MX	report only	all year
002	Antimony, total [as Sb]	MO AVG	report only	all year
002	Antimony, total [as Sb]	DAILY MX	report only	all year
002	Aluminum, total recoverable	MO AVG	report only	all year
002	Aluminum, total recoverable	DAILY MX	report only	all year
002	Lead, total recoverable	MO AVG	report only	all year
002	Lead, total recoverable	DAILY MX	report only	all year
002	Copper, total recoverable	MO AVG	report only	all year
002	Copper, total recoverable	DAILY MX	report only	all year
002	Chromium, hexavalent dissolved [as Cr]	MO AVG	report only	all year
002	Chromium, hexavalent dissolved [as Cr]	DAILY MX	report only	all year
002	Bromoform	MO AVG	report only	all year
002	Bromoform	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Chlorine, total residual	MO AVG	<= 28 ug/L	all year
002	Chlorine, total residual	DAILY MX	<= 57 ug/L	all year
002	Toxicity [chronic], Ceriodaphnia dubia	MO AVG	report only	all year
002	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	report only	all year
002	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	MO AVG	report only	all year
002	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	report only	all year
002	Mercury, total [as Hg]	MO AVG	<= .029 ug/L	all year
002	Mercury, total [as Hg]	DAILY MX	<= .094 ug/L	all year
002	Coliform, fecal general	MO GEOMN	report only	all year
002	Coliform, fecal general	DAILY MX	report only	all year
002	Sulfate	MO AVG	<= 1236 mg/L	all year
002	Sulfate	DAILY MX	<= 1986 mg/L	all year
003	BOD, 5-day, 20 deg. C	MO AVG	<= 30 mg/L	all year
003	BOD, 5-day, 20 deg. C	DAILY MX	<= 60 mg/L	all year
003	BOD, 5-day, 20 deg. C	MO AVG	<= 2.5 lb/d	all year
003	BOD, 5-day, 20 deg. C	DAILY MX	<= 5 lb/d	all year
003	pH	INST MIN	>= 6 SU	all year
003	pH	INST MAX	<= 9 SU	all year
003	Solids, total suspended	MO AVG	<= 30 mg/L	all year
003	Solids, total suspended	DAILY MX	<= 60 mg/L	all year
003	Solids, total suspended	MO AVG	<= 2.5 lb/d	all year
003	Solids, total suspended	DAILY MX	<= 5 lb/d	all year
003	Nitrogen, ammonia total [as N]	MO AVG	<= 15 mg/L	all year
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 30 mg/L	all year
003	Nitrogen, ammonia total [as N]	MO AVG	<= 1.25 lb/d	all year
003	Nitrogen, ammonia total [as N]	DAILY MX	<= 2.5 lb/d	all year
003	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	<= .01 MGD	all year
003	Chlorine, total residual	MO AVG	<= 28 ug/L	all year
003	Chlorine, total residual	DAILY MX	<= 57 ug/L	all year
003	Coliform, fecal general	MO GEOMN	<= 200 #/100mL	all year
003	Coliform, fecal general	DAILY MX	<= 400 #/100mL	all year
009	pH	INST MIN	report only	all year
009	pH	INST MAX	report only	all year
009	Solids, total suspended	MO AVG	report only	all year
009	Solids, total suspended	DAILY MX	report only	all year
009	Arsenic, total recoverable	MO AVG	report only	all year
009	Arsenic, total recoverable	DAILY MX	report only	all year
009	Iron, total [as Fe]	MO AVG	report only	all year
009	Iron, total [as Fe]	DAILY MX	<= 1.5 mg/L	all year
009	Zinc, total recoverable	MO AVG	report only	all year
009	Zinc, total recoverable	DAILY MX	report only	all year
009	Aluminum, total recoverable	MO AVG	report only	all year
009	Aluminum, total recoverable	DAILY MX	report only	all year
009	Copper, total recoverable	MO AVG	report only	all year
009	Copper, total recoverable	DAILY MX	report only	all year
009	Selenium, total [as Se]	MO AVG	report only	all year
009	Selenium, total [as Se]	DAILY MX	report only	all year
009	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
009	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
009	Mercury, total [as Hg]	MO AVG	report only	all year
009	Mercury, total [as Hg]	DAILY MX	report only	all year
010	pH	INST MIN	report only	all year
010	pH	INST MAX	report only	all year
010	Solids, total suspended	MO AVG	report only	all year
010	Solids, total suspended	DAILY MX	report only	all year
010	Arsenic, total recoverable	MO AVG	report only	all year
010	Arsenic, total recoverable	DAILY MX	report only	all year
010	Iron, total [as Fe]	MO AVG	report only	all year
010	Iron, total [as Fe]	DAILY MX	<= 1.5 mg/L	all year
010	Zinc, total recoverable	MO AVG	report only	all year
010	Zinc, total recoverable	DAILY MX	report only	all year
010	Aluminum, total recoverable	MO AVG	report only	all year
010	Aluminum, total recoverable	DAILY MX	report only	all year
010	Copper, total recoverable	MO AVG	report only	all year
010	Copper, total recoverable	DAILY MX	report only	all year
010	Selenium, total [as Se]	MO AVG	report only	all year
010	Selenium, total [as Se]	DAILY MX	report only	all year
010	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
010	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
010	Mercury, total [as Hg]	MO AVG	report only	all year
010	Mercury, total [as Hg]	DAILY MX	report only	all year
011	pH	INST MIN	report only	all year
011	pH	INST MAX	report only	all year
011	Solids, total suspended	MO AVG	report only	all year
011	Solids, total suspended	DAILY MX	report only	all year
011	Arsenic, total recoverable	MO AVG	report only	all year
011	Arsenic, total recoverable	DAILY MX	report only	all year
011	Iron, total [as Fe]	MO AVG	report only	all year
011	Iron, total [as Fe]	DAILY MX	report only	all year
011	Zinc, total recoverable	MO AVG	report only	all year
011	Zinc, total recoverable	DAILY MX	report only	all year
011	Aluminum, total recoverable	MO AVG	report only	all year
011	Aluminum, total recoverable	DAILY MX	report only	all year
011	Copper, total recoverable	MO AVG	report only	all year
011	Copper, total recoverable	DAILY MX	report only	all year
011	Selenium, total [as Se]	MO AVG	report only	all year
011	Selenium, total [as Se]	DAILY MX	report only	all year
011	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
011	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
011	Mercury, total [as Hg]	MO AVG	report only	all year
011	Mercury, total [as Hg]	DAILY MX	report only	all year
012	pH	INST MIN	report only	all year
012	pH	INST MAX	report only	all year
012	Solids, total suspended	MO AVG	report only	all year
012	Solids, total suspended	DAILY MX	report only	all year
012	Arsenic, total recoverable	MO AVG	report only	all year
012	Arsenic, total recoverable	DAILY MX	report only	all year
012	Iron, total [as Fe]	MO AVG	report only	all year
012	Iron, total [as Fe]	DAILY MX	report only	all year
012	Zinc, total recoverable	MO AVG	report only	all year
012	Zinc, total recoverable	DAILY MX	report only	all year
012	Aluminum, total recoverable	MO AVG	report only	all year
012	Aluminum, total recoverable	DAILY MX	report only	all year
012	Copper, total recoverable	MO AVG	report only	all year
012	Copper, total recoverable	DAILY MX	report only	all year
012	Selenium, total [as Se]	MO AVG	report only	all year
012	Selenium, total [as Se]	DAILY MX	report only	all year
012	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
012	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
012	Mercury, total [as Hg]	MO AVG	report only	all year
012	Mercury, total [as Hg]	DAILY MX	report only	all year
102	Nitrite + Nitrate total [as N]	MO AVG	<= 3 mg/L	all year
102	Nitrite + Nitrate total [as N]	DAILY MX	<= 4 mg/L	all year
102	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
102	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
102	Chloride [as Cl]	MO AVG	report only	all year
102	Chloride [as Cl]	DAILY MX	report only	all year
102	Chloride [as Cl]	MO AVG	<= 40886 lb/d	all year
102	Chloride [as Cl]	DAILY MX	<= 79523 lb/d	all year
102	Arsenic, total recoverable	MO AVG	<= .008 mg/L	all year
102	Arsenic, total recoverable	DAILY MX	<= .018 mg/L	all year
102	Arsenic, total recoverable	MO AVG	report only	all year
102	Arsenic, total recoverable	DAILY MX	report only	all year
102	Iron, total recoverable	MO AVG	report only	all year
102	Iron, total recoverable	DAILY MX	report only	all year
102	Iron, total recoverable	MO AVG	<= 218 lb/d	all year
102	Iron, total recoverable	DAILY MX	<= 389 lb/d	all year
102	Selenium, total recoverable	MO AVG	<= .029 mg/L	all year
102	Selenium, total recoverable	DAILY MX	<= .07 mg/L	all year
102	Selenium, total recoverable	MO AVG	report only	all year
102	Selenium, total recoverable	DAILY MX	report only	all year
102	Aluminum, total recoverable	MO AVG	report only	all year
102	Aluminum, total recoverable	DAILY MX	report only	all year
102	Aluminum, total recoverable	MO AVG	<= 64 lb/d	all year
102	Aluminum, total recoverable	DAILY MX	<= 128 lb/d	all year
102	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
102	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
102	Mercury, total [as Hg]	MO AVG	<= .034 ug/L	all year
102	Mercury, total [as Hg]	DAILY MX	<= .103 ug/L	all year
102	Mercury, total [as Hg]	MO AVG	report only	all year
102	Mercury, total [as Hg]	DAILY MX	report only	all year
106	pH	INST MIN	report only	all year
106	pH	INST MAX	report only	all year
106	Solids, total suspended	MO AVG	report only	all year
106	Solids, total suspended	DAILY MX	report only	all year
106	Arsenic, total recoverable	MO AVG	report only	all year
106	Arsenic, total recoverable	DAILY MX	report only	all year
106	Iron, total [as Fe]	MO AVG	report only	all year
106	Iron, total [as Fe]	DAILY MX	report only	all year
106	Zinc, total recoverable	MO AVG	report only	all year
106	Zinc, total recoverable	DAILY MX	report only	all year
106	Aluminum, total recoverable	MO AVG	report only	all year
106	Aluminum, total recoverable	DAILY MX	report only	all year
106	Copper, total recoverable	MO AVG	report only	all year
106	Copper, total recoverable	DAILY MX	report only	all year
106	Selenium, total [as Se]	MO AVG	report only	all year
106	Selenium, total [as Se]	DAILY MX	report only	all year
106	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
106	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
106	Mercury, total [as Hg]	MO AVG	report only	all year
106	Mercury, total [as Hg]	DAILY MX	report only	all year
202	Copper, total [as Cu]	MO AVG	<= 1 mg/L	all year
202	Copper, total [as Cu]	DAILY MX	<= 1 mg/L	all year
202	Iron, total [as Fe]	MO AVG	<= 1 mg/L	all year
202	Iron, total [as Fe]	DAILY MX	<= 1 mg/L	all year
202	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
202	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
INT	Toxics, percent removal	MH	>= 96 %	all year