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Missouri-American Water Company

Sewerage Systems, Holts Summit, Missouri. NPDES permit MO0120022 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 (12 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
7 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 maximum12.4≤ 8.4 mg/L48%
December 2025Nitrogen, ammonia total [as N], monthly average12.4≤ 2.2 mg/L464%
March 2026Nitrogen, ammonia total [as N], daily maximum26.3≤ 12.1 mg/L117%
March 2026Nitrogen, ammonia total [as N], monthly average26.3≤ 3.1 mg/L748%
June 2026Nitrogen, ammonia total [as N], daily maximum16.6≤ 10.1 mg/L64%
June 2026Nitrogen, ammonia total [as N], monthly average16.6≤ 1.5 mg/L1007%
September 2026Nitrogen, ammonia total [as N], monthly average5.41≤ 1 mg/L441%

Limits in force (18)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedweekly average≤ 110 mg/Lall year
Solids, total suspendedmonthly average≤ 70 mg/Lall year
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≤ 10.1 mg/LApr–Jun
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LOct–Dec
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≤ 1.5 mg/LApr–Jun
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
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.

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/MO0120022 · MCP: https://passage-data.com/mcp