WEST PENN POWER CO — NPDES permit PA0091740: limits, due date and EPA's record

NPDES permit PA0091740 · Minor NON-POTW · effective, expires 2027-06-30 · EPA's file as of 2026-09-19

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

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among PA permits in EPA's filings — check your permit).

Limits in force (27)

Outfall	Parameter	Statistic	Limit	Months
001	pH	INST MIN	>= 6 SU	all year
001	pH	INST MAX	<= 9 SU	all year
001	Solids, total suspended	MO AVG	<= 30 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 75 mg/L	all year
001	Oil & Grease	MO AVG	<= 15 mg/L	all year
001	Oil & Grease	DAILY MX	<= 20 mg/L	all year
001	Iron, total [as Fe]	MO AVG	<= 1.6 mg/L	all year
001	Iron, total [as Fe]	DAILY MX	<= 4 mg/L	all year
001	Manganese, total [as Mn]	MO AVG	<= 1.1 mg/L	all year
001	Manganese, total [as Mn]	DAILY MX	<= 2.8 mg/L	all year
001	Aluminum, total [as Al]	MO AVG	<= .75 mg/L	all year
001	Aluminum, total [as Al]	DAILY MX	<= 1.3 mg/L	all year
001	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
001	Flow, in conduit or thru treatment plant	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	<= 75 mg/L	all year
002	Oil & Grease	MO AVG	<= 15 mg/L	all year
002	Oil & Grease	DAILY MX	<= 20 mg/L	all year
002	Boron, total [as B]	MO AVG	<= 5.81 mg/L	all year
002	Boron, total [as B]	DAILY MX	<= 9.07 mg/L	all year
002	Iron, dissolved [as Fe]	DAILY MX	<= 7 mg/L	all year
002	Selenium, total [as Se]	MO AVG	report only	all year
002	Selenium, total [as Se]	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