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City of St Clair

Sewage treatment plant, major discharger, St. Clair, Missouri. NPDES permit MO0099465 expired Mar 31, 2025; its limits still apply. Last 12 months: over a limit 7 times (last August 2026), 2 required values missing, 3 of 27 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M monthly (22 values), outfall 001 form Q quarterly (14 values), outfall INF form IM monthly (10 values), outfall 001 form WA yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 2 required values missing, 6 of 29 reports late

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

Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, monthly average34≤ 30 mg/L13%
December 2025BOD, 5-day, 20 deg. C, weekly average58≤ 45 mg/L29%
December 2025BOD, 5-day, percent removal, monthly average minimum75.36≥ 85 %64%
July 2026E. coli, 7-day geometric mean2419.6≤ 1030 #/100mL135%
July 2026Nitrogen, ammonia total [as N], monthly average3.78≤ 1.5 mg/L152%
August 2026E. coli, 7-day geometric mean2419.6≤ 1030 #/100mL135%
August 2026Nitrogen, ammonia total [as N], monthly average3.96≤ 1.5 mg/L164%

Limits in force (64)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall 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, ammonia total [as N]daily maximum≤ 12.1 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LNov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJul, Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Mar001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 2.6 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 1.7 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 3.1 mg/LNov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 2.2 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJul, Aug001
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LFeb001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Mar001
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LApr001
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
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Arsenic, total recoverabledaily maximumreport only (ug/L)all year001
Arsenic, total recoverablemonthly averagereport only (ug/L)all year001
Zinc, total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverablemonthly averagereport only (ug/L)all year001
Lead, total recoverabledaily maximum≤ 14.8 ug/Lall year001
Lead, total recoverablemonthly average≤ 5 ug/Lall year001
Copper, total recoverabledaily maximum≤ 28.2 ug/Lall year001
Copper, total recoverablemonthly average≤ 13.8 ug/Lall year001
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year001
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)all year001
Di[2-ethylhexyl] phthalate [DEHP]daily maximumreport only (ug/L)all year001
Di[2-ethylhexyl] phthalate [DEHP]monthly 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
E. coli7-day geometric mean≤ 1030 #/100mLApr–Oct001
E. coli30-day geometric mean≤ 206 #/100mLApr–Oct001
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (toxic)all year001
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximumreport only (toxic)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly 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

How strict are these limits?

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/MO0099465 · MCP: https://passage-data.com/mcp