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Missouri-American Water Company

Sewerage Systems, Holts Summit, Missouri. NPDES permit MO0121061 expired Jun 30, 2025; its limits still apply. Last 12 months: over a limit 7 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form Q quarterly (14 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 4 reports late

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

Period endingParameterReportedLimitOver by
December 2025Nitrogen, ammonia total [as N], daily maximum10.99≤ 8.4 mg/L31%
December 2025Nitrogen, ammonia total [as N], monthly average10.99≤ 2.2 mg/L400%
March 2026Nitrogen, ammonia total [as N], daily maximum14.6≤ 12.1 mg/L21%
March 2026Nitrogen, ammonia total [as N], monthly average14.6≤ 3.1 mg/L371%
June 2026Nitrogen, ammonia total [as N], monthly average8.34≤ 1.5 mg/L456%
September 2026Nitrogen, ammonia total [as N], daily maximum8.57≤ 8.4 mg/L2%
September 2026Nitrogen, ammonia total [as N], monthly average8.57≤ 1 mg/L757%

Limits in force (20)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LApr–Jun
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LJul–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJan–Mar
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LOct–Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LApr–Jun
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LJul–Sep
Nitrogen, ammonia total [as N]monthly average≤ 3.1 mg/LJan–Mar
Nitrogen, ammonia total [as N]monthly average≤ 2.2 mg/LOct–Dec
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Chlorine, total residualdaily maximum≤ 18 ug/LApr–Dec
Chlorine, total residualmonthly average≤ 9 ug/LApr–Dec
E. colidaily maximum≤ 1030 #/100mLApr–Dec
E. coli30-day geometric mean≤ 206 #/100mLApr–Dec

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/MO0121061 · MCP: https://passage-data.com/mcp