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City of Piedmont

Sewage treatment plant, Piedmont, Missouri. NPDES permit MO0117129 expired Dec 31, 2024; its limits still apply. Last 12 months: over a limit 13 times (last June 2026), 2 of 6 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form Q quarterly (20 values), outfall INF form IQ quarterly (2 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
8 values over a limit, 4 required values missing, 0 of 8 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, monthly average30.7≤ 30 mg/L2%
December 2025Nitrogen, ammonia total [as N], daily maximum20.7≤ 9.8 mg/L111%
December 2025Nitrogen, ammonia total [as N], monthly average20.7≤ 2.8 mg/L639%
December 2025Solids, suspended percent removal, monthly average minimum79≥ 85 %40%
March 2026Nitrogen, ammonia total [as N], daily maximum17.2≤ 9.8 mg/L76%
March 2026Nitrogen, ammonia total [as N], monthly average17.2≤ 2.8 mg/L514%
June 2026BOD, 5-day, 20 deg. C, monthly average41.1≤ 30 mg/L37%
June 2026BOD, 5-day, percent removal, monthly average minimum82≥ 85 %20%
June 2026E. coli, 30-day geometric mean> 2420≤ 206 #/100mL—
June 2026E. coli, weekly average> 2420≤ 1030 #/100mL—
June 2026Nitrogen, ammonia total [as N], daily maximum41.4≤ 5.2 mg/L696%
June 2026Nitrogen, ammonia total [as N], monthly average41.4≤ 1.3 mg/L3085%
June 2026Solids, suspended percent removal, monthly average minimum38≥ 85 %313%

Limits in force (24)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimumreport only (mg/L)Apr–Dec001
Oxygen, dissolved [DO]monthly average minimumreport only (mg/L)Apr–Dec001
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≤ 5.2 mg/LApr–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 9.8 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LApr–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 2.8 mg/LJan, Feb, Mar, Oct, Nov, Dec001
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≤ 18 ug/LApr–Dec001
Chlorine, total residualmonthly average≤ 9 ug/LApr–Dec001
E. coliweekly average≤ 1030 #/100mLApr–Dec001
E. coli30-day geometric mean≤ 206 #/100mLApr–Dec001
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

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/MO0117129 · MCP: https://passage-data.com/mcp