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The Labadie Creek Watershed Sewer

Sewage treatment plant, Gray Summit, Missouri. NPDES permit MO0109177, in force until Jun 30, 2027. Last 12 months: over a limit 25 times (last September 2026), 2 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M monthly (14 values), outfall INF form IM monthly (2 values), outfall 001 form WA every 60 months
Renewal application due
Jan 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
33 values over a limit, 34 required values missing, 14 of 24 reports late

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

All 25 values over a limit
Period endingParameterReportedLimitOver by
October 2025E. coli, 30-day geometric mean2700≤ 206 #/100mL1211%
October 2025E. coli, 7-day geometric mean2700≤ 1030 #/100mL162%
December 2025Nitrogen, ammonia total [as N], monthly average9.94≤ 2.7 mg/L268%
January 2026Nitrogen, ammonia total [as N], daily maximum13.46≤ 12.1 mg/L11%
January 2026Nitrogen, ammonia total [as N], monthly average13.46≤ 3.1 mg/L334%
February 2026Nitrogen, ammonia total [as N], daily maximum16.76≤ 12.1 mg/L39%
February 2026Nitrogen, ammonia total [as N], monthly average16.76≤ 3.1 mg/L441%
March 2026Nitrogen, ammonia total [as N], daily maximum20.09≤ 10.1 mg/L99%
March 2026Nitrogen, ammonia total [as N], monthly average20.09≤ 2.7 mg/L644%
April 2026BOD, 5-day, 20 deg. C, monthly average48≤ 45 mg/L7%
April 2026E. coli, 30-day geometric mean9400≤ 206 #/100mL4463%
April 2026E. coli, 7-day geometric mean9400≤ 1030 #/100mL813%
April 2026Nitrogen, ammonia total [as N], monthly average5.81≤ 2.1 mg/L177%
May 2026E. coli, 30-day geometric mean2300≤ 206 #/100mL1017%
May 2026E. coli, 7-day geometric mean2300≤ 1030 #/100mL123%
June 2026E. coli, 30-day geometric mean3700≤ 206 #/100mL1696%
June 2026E. coli, 7-day geometric mean3700≤ 1030 #/100mL259%
July 2026E. coli, 30-day geometric mean1900≤ 206 #/100mL822%
July 2026E. coli, 7-day geometric mean1900≤ 1030 #/100mL84%
August 2026E. coli, 30-day geometric mean1900≤ 206 #/100mL822%
August 2026E. coli, 7-day geometric mean1900≤ 1030 #/100mL84%
August 2026Nitrogen, ammonia total [as N], monthly average1.96≤ .9 mg/L118%
September 2026E. coli, 30-day geometric mean3200≤ 206 #/100mL1453%
September 2026E. coli, 7-day geometric mean3200≤ 1030 #/100mL211%
September 2026Nitrogen, ammonia total [as N], monthly average8.3≤ 1.2 mg/L592%

Limits in force (34)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 110 mg/Lall year001
Solids, total suspendedmonthly average≤ 70 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJan, Feb001
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LJul, Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LMar, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 3.1 mg/LJan, Feb001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ .9 mg/LJul, Aug001
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LMar, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 1.2 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 2.4 mg/LNov001
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LJun001
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≥ 65 %all year001
Solids, suspended percent removalmonthly average minimum≥ 65 %all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly 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/MO0109177 · MCP: https://passage-data.com/mcp