Metropolitan St Louis Sewer District — NPDES permit MO0025160: limits, due date and EPA's record

NPDES permit MO0025160 · Major POTW · effective, expires 2031-08-31 · EPA's file as of 2026-09-19

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

Reporting

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

Limits in force (45)

Outfall	Parameter	Statistic	Limit	Months
004	pH	MINIMUM	>= 6 SU	all year
004	pH	MAXIMUM	<= 9 SU	all year
004	Solids, total suspended	WKLY AVG	<= 45 mg/L	all year
004	Solids, total suspended	MO AVG	<= 30 mg/L	all year
004	Oil and grease [soxhlet extr.] tot.	DAILY MX	<= 15 mg/L	all year
004	Oil and grease [soxhlet extr.] tot.	MO AVG	<= 10 mg/L	all year
004	Nitrogen, total [as N]	DAILY MX	report only	all year
004	Nitrogen, total [as N]	MO AVG	report only	all year
004	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
004	Nitrogen, ammonia total [as N]	MO AVG	report only	all year
004	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
004	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	all year
004	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
004	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
004	Phosphorus, total [as P]	DAILY MX	report only	all year
004	Phosphorus, total [as P]	MO AVG	report only	all year
004	Phosphorus, total [as P]	ANNL TOT	<= 122000 lb/yr	Feb
004	Phosphorus, total [as P] [credit]	ANNL TOT	report only	Feb
004	Phosphorus, total [as P] [credit]	MO TOTAL	report only	all year
004	Phosphorus, total [as P] [delivered]	MO TOTAL	report only	all year
004	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
004	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
004	Chlorine, total residual	DAILY MX	<= 205.1 ug/L	Apr, May, Jun, Jul, Aug, Sep, Oct
004	Chlorine, total residual	MO AVG	<= 102.2 ug/L	Apr, May, Jun, Jul, Aug, Sep, Oct
004	E. coli	7 DA GEO	<= 1030 #/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
004	E. coli	30DA GM	<= 206 #/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
004	Toxicity [acute], Ceriodaphnia dubia	DAILY MX	report only	all year
004	Toxicity [acute], Pimephales promelas [Fathead Minnow]	DAILY MX	report only	all year
004	BOD, carbonaceous [5 day, 20 C]	WKLY AVG	<= 40 mg/L	all year
004	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 25 mg/L	all year
004	BOD, carbonaceous, percent removal	MO AV MN	>= 85 %	all year
004	Solids, suspended percent removal	MO AV MN	>= 85 %	all year
004	Flow, total	MO TOTAL	report only	all year
INF	Solids, total suspended	MO AVG	report only	all year
INF	Nitrogen, total [as N]	DAILY MX	report only	all year
INF	Nitrogen, total [as N]	MO AVG	report only	all year
INF	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
INF	Nitrogen, ammonia total [as N]	MO AVG	report only	all year
INF	Nitrogen, Kjeldahl, total [as N]	DAILY MX	report only	all year
INF	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	all year
INF	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
INF	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
INF	Phosphorus, total [as P]	DAILY MX	report only	all year
INF	Phosphorus, total [as P]	MO AVG	report only	all year
INF	BOD, carbonaceous [5 day, 20 C]	MO AVG	report only	all year