Metropolitan St Louis Sewer District

NPDES permit MO0004391 · Major POTW · effective, expires 2031-08-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

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

0values over a limit
0required values missing, on 0 form(s)
0of 12 forms filed late

Last period with anything received: 2026-07-31.

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)

OutfallParameterStatisticLimitMonths
007pHMINIMUM >= 6 SU all year
007pHMAXIMUM <= 9 SU all year
007Solids, total suspendedWKLY AVG <= 45 mg/L all year
007Solids, total suspendedMO AVG <= 30 mg/L all year
007Oil and grease [soxhlet extr.] tot.DAILY MX <= 15 mg/L all year
007Oil and grease [soxhlet extr.] tot.MO AVG <= 10 mg/L all year
007Nitrogen, total [as N]DAILY MX report only all year
007Nitrogen, total [as N]MO AVG report only all year
007Nitrogen, ammonia total [as N]DAILY MX report only all year
007Nitrogen, ammonia total [as N]MO AVG report only all year
007Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
007Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
007Nitrite + Nitrate total [as N]DAILY MX report only all year
007Nitrite + Nitrate total [as N]MO AVG report only all year
007Phosphorus, total [as P]DAILY MX report only all year
007Phosphorus, total [as P]MO AVG report only all year
007Phosphorus, total [as P]ANNL TOT report only Feb
007Phosphorus, total [as P] [credit]ANNL TOT report only Feb
007Phosphorus, total [as P] [credit]MO TOTAL report only all year
007Phosphorus, total [as P] [delivered]MO TOTAL report only all year
007Flow, in conduit or thru treatment plantDAILY MX report only all year
007Flow, in conduit or thru treatment plantMO AVG report only all year
007E. coli7 DA GEO <= 1030 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
007E. coli30DA GM <= 206 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
007Toxicity [acute], Ceriodaphnia dubiaDAILY MX report only all year
007Toxicity [acute], Pimephales promelas [Fathead Minnow]DAILY MX report only all year
007BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 40 mg/L all year
007BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
007BOD, carbonaceous, percent removalMO AV MN >= 85 % all year
007Solids, suspended percent removalMO AV MN >= 85 % all year
007Flow, totalMO TOTAL report only all year
INFSolids, total suspendedDAILY MX report only all year
INFSolids, total suspendedMO AVG report only all year
INFNitrogen, total [as N]DAILY MX report only all year
INFNitrogen, total [as N]MO AVG report only all year
INFNitrogen, ammonia total [as N]DAILY MX report only all year
INFNitrogen, ammonia total [as N]MO AVG report only all year
INFNitrogen, Kjeldahl, total [as N]DAILY MX report only all year
INFNitrogen, Kjeldahl, total [as N]MO AVG report only all year
INFNitrite + Nitrate total [as N]DAILY MX report only all year
INFNitrite + Nitrate total [as N]MO AVG report only all year
INFPhosphorus, total [as P]DAILY MX report only all year
INFPhosphorus, total [as P]MO AVG report only all year
INFBOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
INFBOD, carbonaceous [5 day, 20 C]MO AVG report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states