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City of Tarkio

Sewage treatment plant, Tarkio, Missouri. NPDES permit MO0051608, in force until Apr 30, 2028. Last 12 months: over a limit 12 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M monthly (13 values), outfall 001 form Q quarterly (10 values), outfall INF form IM monthly (2 values), outfall INF form IQ quarterly (10 values)
Renewal application due
Nov 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 0 of 32 reports late

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

Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, percent removal, monthly average minimum64≥ 65 %3%
October 2025Solids, suspended percent removal, monthly average minimum21≥ 65 %126%
November 2025BOD, 5-day, percent removal, monthly average minimum55≥ 65 %29%
November 2025Solids, suspended percent removal, monthly average minimum37≥ 65 %80%
January 2026Solids, suspended percent removal, monthly average minimum64≥ 65 %3%
March 2026BOD, 5-day, percent removal, monthly average minimum63≥ 65 %6%
March 2026Solids, suspended percent removal, monthly average minimum42≥ 65 %66%
April 2026Solids, suspended percent removal, monthly average minimum48≥ 65 %49%
June 2026BOD, 5-day, percent removal, monthly average minimum37≥ 65 %80%
June 2026Solids, suspended percent removal, monthly average minimum38≥ 65 %77%
August 2026BOD, 5-day, percent removal, monthly average minimum28≥ 65 %106%
August 2026Solids, suspended percent removal, monthly average minimum58≥ 65 %20%

Limits in force (37)

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 SUall year001
Solids, total suspendedweekly average≤ 120 mg/Lall year001
Solids, total suspendedmonthly average≤ 80 mg/Lall year001
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year001
Oil and grease [soxhlet extr.] tot.monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LJan, Feb, Mar, May, Aug, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LApr, Jun, Jul, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 14.7 mg/LJan, Feb, Mar, May, Aug, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 12.1 mg/LApr, Jun, Jul, Sep, Oct001
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≥ 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
Nitrogen, total [as N]daily maximumreport only (mg/L)all yearINF
Nitrogen, total [as N]monthly 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

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/MO0051608 · MCP: https://passage-data.com/mcp