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City of Middletown

Sewage treatment plant, Middletown, Missouri. NPDES permit MO0055387 expired Jun 30, 2024; its limits still apply. Last 12 months: no values over a limit, 20 required values missing, 4 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M monthly (19 values), outfall INF form IM monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 24 required values missing, 8 of 24 reports late

Limits in force (24)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimumreport only (mg/L)Apr–Oct001
Oxygen, dissolved [DO]monthly average minimumreport only (mg/L)Apr–Oct001
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
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 maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]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
Chlorine, total residualdaily maximum≤ 17 ug/LApr–Oct001
Chlorine, total residualmonthly average≤ 8 ug/LApr–Oct001
E. coli7-day geometric mean≤ 1030 #/100mLApr–Oct001
E. coli30-day geometric mean≤ 206 #/100mLApr–Oct001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year001
Solids, suspended percent removalmonthly average minimum≥ 65 %all year001
Duration of dischargemonthly maximum≤ 10 dJan, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec001
Duration of dischargemonthly maximum≤ 8 dFeb001
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.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MO0055387 · MCP: https://passage-data.com/mcp