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City of Piedmont

Sewage treatment plant, Piedmont, Missouri. NPDES permit MO0047341 expired Dec 31, 2024; its limits still apply. Last 12 months: over a limit 16 times (last August 2026), 10 of 50 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M monthly (16 values), outfall 001 form Q quarterly (8 values), outfall 002 form M monthly (10 values), outfall INF form IM monthly (2 values), outfall INF form IQ quarterly (8 values), outfall SM1 form DM monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
9 values over a limit, 0 required values missing, 0 of 56 reports late

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

All 16 values over a limit
Period endingParameterReportedLimitOver by
January 2026BOD, 5-day, 20 deg. C, monthly average13≤ 10 mg/L30%
January 2026BOD, 5-day, percent removal, monthly average minimum72≥ 85 %87%
January 2026Solids, suspended percent removal, monthly average minimum56≥ 85 %193%
March 2026BOD, 5-day, 20 deg. C, monthly average10.9≤ 10 mg/L9%
March 2026BOD, 5-day, percent removal, monthly average minimum72≥ 85 %87%
April 2026E. coli, 30-day geometric mean496≤ 206 #/100mL141%
May 2026BOD, 5-day, 20 deg. C, daily maximum30.1≤ 20 mg/L51%
May 2026BOD, 5-day, 20 deg. C, monthly average30.1≤ 10 mg/L201%
May 2026BOD, 5-day, percent removal, monthly average minimum73≥ 85 %80%
May 2026E. coli, 30-day geometric mean754.33≤ 206 #/100mL266%
May 2026E. coli, 7-day geometric mean> 2420≤ 1030 #/100mL—
May 2026Nitrogen, ammonia total [as N], monthly average9.47≤ 4.7 mg/L101%
May 2026Solids, total suspended, monthly average31≤ 30 mg/L3%
July 2026E. coli, 30-day geometric mean302≤ 206 #/100mL47%
August 2026E. coli, 30-day geometric mean402≤ 206 #/100mL95%
August 2026Nitrogen, ammonia total [as N], monthly average3.89≤ 2.8 mg/L39%

Limits in force (62)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year001
Oxygen, dissolved [DO]monthly average minimumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 20 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year001
pHminimum≥ 6 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≤ 13 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 13 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 13 mg/LJan, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 10.9 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 10.9 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 13 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 13 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 13 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 13 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 5.4 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 3.8 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 6.7 mg/LJan, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 2.8 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 5.9 mg/LFeb001
Nitrogen, ammonia total [as N]monthly average≤ 5.8 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 3.1 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 3.7 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 4.7 mg/LMay001
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
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
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 average≤ 1619 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly average≤ 810 lb/dall year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 580 mg/Lall year002
Solids, total suspendedmonthly average≤ 290 lb/dall year002
Oil and grease [soxhlet extr.] tot.monthly average≤ 90 mg/Lall year002
Oil and grease [soxhlet extr.] tot.monthly average≤ 45 lb/dall year002
Flow, in conduit or thru treatment plantdaily maximum≤ .06 MGDall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
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
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all yearSM1
Oxygen, dissolved [DO]monthly averagereport only (mg/L)all yearSM1

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/MO0047341 · MCP: https://passage-data.com/mcp