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City of Dexter

Sewage treatment plant, Dexter, Missouri. NPDES permit MO0043206 expired Mar 31, 2024; its limits still apply. Last 12 months: over a limit 26 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M monthly (12 values), outfall 001 form Q quarterly (14 values), outfall INF form IM quarterly (10 values), outfall SM1 form UM quarterly (8 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
37 values over a limit, 0 required values missing, 5 of 24 reports late

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

All 26 values over a limit
Period endingParameterReportedLimitOver by
October 2025E. coli, 30-day geometric mean1550≤ 206 #/100mL652%
October 2025E. coli, 7-day geometric mean1550≤ 1030 #/100mL50%
November 2025Solids, total suspended, monthly average42≤ 30 mg/L40%
December 2025BOD, 5-day, percent removal, monthly average minimum82.8≥ 85 %15%
December 2025Solids, suspended percent removal, monthly average minimum42.2≥ 85 %285%
December 2025Solids, total suspended, monthly average38≤ 30 mg/L27%
January 2026Nitrogen, ammonia total [as N], monthly average6.36≤ 2.7 mg/L136%
February 2026Nitrogen, ammonia total [as N], daily maximum12.9≤ 10.1 mg/L28%
February 2026Nitrogen, ammonia total [as N], monthly average12.9≤ 2.7 mg/L378%
March 2026BOD, 5-day, 20 deg. C, monthly average33.7≤ 30 mg/L12%
March 2026BOD, 5-day, percent removal, monthly average minimum84.89≥ 85 %1%
March 2026Nitrogen, ammonia total [as N], daily maximum10.5≤ 10.1 mg/L4%
March 2026Nitrogen, ammonia total [as N], monthly average10.5≤ 2.7 mg/L289%
March 2026Solids, suspended percent removal, monthly average minimum70.58≥ 85 %96%
March 2026Solids, total suspended, monthly average47≤ 30 mg/L57%
March 2026Solids, total suspended, weekly average47≤ 45 mg/L4%
April 2026E. coli, 30-day geometric mean1410≤ 206 #/100mL584%
April 2026E. coli, 7-day geometric mean1410≤ 1030 #/100mL37%
April 2026Solids, total suspended, monthly average45≤ 30 mg/L50%
May 2026Nitrogen, ammonia total [as N], monthly average1.53≤ 1.3 mg/L18%
May 2026Solids, total suspended, monthly average31≤ 30 mg/L3%
June 2026BOD, 5-day, percent removal, monthly average minimum77.2≥ 85 %52%
June 2026Solids, suspended percent removal, monthly average minimum59.5≥ 85 %170%
June 2026Solids, total suspended, monthly average31≤ 30 mg/L3%
July 2026Solids, total suspended, monthly average50≤ 30 mg/L67%
July 2026Solids, total suspended, weekly average50≤ 45 mg/L11%

Limits in force (46)

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≤ 5 mg/LApr–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 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≤ 2.7 mg/LJan, Feb, Mar, Oct, Nov, Dec001
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
Selenium, total recoverabledaily maximumreport only (ug/L)all year001
Selenium, total recoverablemonthly averagereport only (ug/L)all year001
Thallium, total recoverabledaily maximumreport only (ug/L)all year001
Thallium, total recoverablemonthly 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
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
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearSM1
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearSM1
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all yearSM1
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearSM1
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all yearSM1
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearSM1
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearSM1
Phosphorus, total [as P]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/MO0043206 · MCP: https://passage-data.com/mcp