UPPER MERION SANITARY AND STORMWATER AUTH — NPDES permit PA0026131: limits, due date and EPA's record

NPDES permit PA0026131 · Major POTW · effective, expires 2029-06-30 · EPA's file as of 2026-09-19

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

Last period with anything received: 2026-06-30. Most often over: BOD, carbonaceous [5 day, 20 C] (2), Chlorine, total residual (1), Nitrogen, ammonia total [as N] (1).

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 (53)

Outfall	Parameter	Statistic	Limit	Months
002	Oxygen, dissolved [DO]	INST MIN	>= 5 mg/L	all year
002	BOD, 5-day, 20 deg. C	MO AVG	report only	all year
002	BOD, 5-day, 20 deg. C	MO AVG	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	WKLY AVG	<= 45 mg/L	all year
002	Solids, total suspended	MO AVG	<= 1500 lb/d	all year
002	Solids, total suspended	WKLY AVG	<= 2250 lb/d	all year
002	Solids, total suspended	MO AVG	report only	all year
002	Solids, total suspended	MO AVG	report only	all year
002	Nitrogen, total [as N]	MO AVG	report only	all year
002	Nitrogen, total [as N]	MO AVG	report only	all year
002	Nitrogen, ammonia total [as N]	MO AVG	<= 15 mg/L	May, Jun, Jul, Aug, Sep, Oct
002	Nitrogen, ammonia total [as N]	MO AVG	<= 20 mg/L	Jan, Feb, Mar, Apr, Nov, Dec
002	Nitrogen, ammonia total [as N]	MO AVG	<= 750 lb/d	May, Jun, Jul, Aug, Sep, Oct
002	Nitrogen, ammonia total [as N]	MO AVG	<= 1000 lb/d	Jan, Feb, Mar, Apr, Nov, Dec
002	Phosphorus, total [as P]	MO AVG	report only	all year
002	Phosphorus, total [as P]	MO AVG	report only	all year
002	Copper, total [as Cu]	MO AVG	<= .041 mg/L	all year
002	Copper, total [as Cu]	DAILY MX	<= .048 mg/L	all year
002	Copper, total [as Cu]	MO AVG	<= 2.05 lb/d	all year
002	Copper, total [as Cu]	DAILY MX	<= 2.4 lb/d	all year
002	Zinc, total [as Zn]	QRTR AVG	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	<= .5 mg/L	all year
002	Chlorine, total residual	INST MAX	<= 1.2 mg/L	all year
002	E. coli	INST MAX	report only	all year
002	PCBs Dry Weather Analysis	DAILY MX	report only	all year
002	Toxicity [chronic], Ceriodaphnia dubia	DAILY MX	report only	all year
002	Toxicity [chronic], Pimephales promelas [Fathead Minnow]	DAILY MX	report only	all year
002	Solids, total dissolved	QRTR AVG	<= 1000 mg/L	all year
002	Solids, total dissolved	QRTR AVG	report only	all year
002	Coliform, fecal general	GEO MEAN	<= 200 #/100mL	May, Jun, Jul, Aug, Sep
002	Coliform, fecal general	GEO MEAN	<= 200 #/100mL	Jan, Feb, Mar, Apr, Oct, Nov, Dec
002	Coliform, fecal general	INST MAX	<= 1000 #/100mL	May, Jun, Jul, Aug, Sep
002	Coliform, fecal general	INST MAX	<= 1000 #/100mL	Jan, Feb, Mar, Apr, Oct, Nov, Dec
002	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 25 mg/L	all year
002	BOD, carbonaceous [5 day, 20 C]	WKLY AVG	<= 40 mg/L	all year
002	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 1251 lb/d	all year
002	BOD, carbonaceous [5 day, 20 C]	WKLY AVG	<= 2000 lb/d	all year
002	TU Static 7Day Chronic Ceriodaphnia dubia	DAILY MX	report only	all year
002	Static 7Day Chronic Pimephales Promelas	DAILY MX	report only	all year
003	Oxygen demand, chem. [high level] [COD]	ANNL AVG	report only	all year
003	pH	ANNL AVG	report only	all year
003	Solids, total suspended	ANNL AVG	report only	all year
003	Oil & Grease	ANNL AVG	report only	all year
003	Nitrogen, Kjeldahl, total [as N]	ANNL AVG	report only	all year
003	Phosphorus, total [as P]	ANNL AVG	report only	all year
003	Iron, dissolved [as Fe]	ANNL AVG	report only	all year
003	Coliform, fecal general	ANNL AVG	report only	all year
003	BOD, carbonaceous [5 day, 20 C]	ANNL AVG	report only	all year