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Metropolitan St Louis Sewer District

Sewage treatment plant, major discharger, St Louis, Missouri. NPDES permit MO0025178, in force until Aug 31, 2031. Last 12 months: over a limit 3 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M monthly (29 values), outfall INF form IM monthly (14 values), outfall 001 form Q quarterly, outfall 001 form WA yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 17 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
June 2026Solids, total suspended, monthly average66≤ 45 mg/L47%
June 2026Solids, total suspended, monthly average94214≤ 94063 lb/d0%
June 2026Solids, total suspended, weekly average97≤ 65 mg/L49%

Limits in force (53)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 60 mg/Lall year001
Solids, total suspendedmonthly average≤ 40 mg/Lall year001
Solids, total suspendedmonthly average≤ 94063 lb/dall year001
Oil and grease [soxhlet extr.] tot.daily maximum≤ 15 mg/Lall year001
Oil and grease [soxhlet extr.] tot.monthly average≤ 10 mg/Lall year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]annual total≤ 456000 lb/yrFeb001
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all year001
Cyanide, free [amenable to chlorination]monthly averagereport only (ug/L)all year001
Silver total recoverabledaily maximumreport only (ug/L)all year001
Silver total recoverablemonthly averagereport only (ug/L)all year001
Phosphorus, total [as P] [credit]annual totalreport only (lb/yr)Feb001
Phosphorus, total [as P] [credit]monthly totalreport only (lb/yr)all year001
Phosphorus, total [as P] [delivered]monthly totalreport only (lb/mo)all year001
Bis[2-chloroethyl] etherdaily maximumreport only (ug/L)all year001
Bis[2-chloroethyl] ethermonthly averagereport only (ug/L)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Chlorine, total residualdaily maximum≤ 140 mg/LApr–Oct001
Chlorine, total residualmonthly average≤ 70 mg/LApr–Oct001
E. coli7-day geometric mean≤ 5670 #/100mLApr–Oct001
E. coli30-day geometric mean≤ 1134 #/100mLApr–Oct001
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (toxic)all year001
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximumreport only (toxic)all year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 60 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 83611 lb/dall year001
Flow, totalmonthly totalreport only (MGD)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Nitrogen, total [as N]daily maximumreport only (mg/L)all yearINF
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearINF
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearINF
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearINF
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all yearINF
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearINF
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all yearINF
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearINF
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearINF
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearINF
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all yearINF
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearINF

Cited limits by parameter: Missouri's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MO0025178 · MCP: https://passage-data.com/mcp