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City of Clark

Sewage treatment plant, Clark, Missouri. NPDES permit MO0054585, in force until Apr 30, 2030. Last 12 months: over a limit 4 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form Q quarterly (14 values), outfall INF form IQ quarterly (2 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 7 reports late

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

Period endingParameterReportedLimitOver by
December 2025Nitrogen, ammonia total [as N], daily maximum14.8≤ 9.5 mg/L56%
December 2025Nitrogen, ammonia total [as N], monthly average14.8≤ 2.8 mg/L429%
March 2026Nitrogen, ammonia total [as N], daily maximum19.2≤ 9.5 mg/L102%
March 2026Nitrogen, ammonia total [as N], monthly average19.2≤ 2.7 mg/L611%

Limits in force (20)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedweekly average≤ 120 mg/Lall year001
Solids, total suspendedmonthly average≤ 80 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 4.5 mg/LApr–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 9.5 mg/LOct–Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 9.5 mg/LJan–Mar001
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LApr–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 2.8 mg/LOct–Dec001
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LJan–Mar001
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–Dec001
E. coli30-day geometric mean≤ 206 #/100mLApr–Dec001
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

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/MO0054585 · MCP: https://passage-data.com/mcp