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Missouri-American Water Company

Sewerage Systems, Smithton, Missouri. NPDES permit MO0025828, in force until Sep 30, 2028. Last 12 months: over a limit 21 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form M monthly (12 values), form Q quarterly (2 values)
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
28 values over a limit, 2 required values missing, 0 of 16 reports late

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

All 21 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average74≤ 45 mg/L64%
October 2025BOD, 5-day, 20 deg. C, weekly average101≤ 65 mg/L55%
October 2025Nitrogen, ammonia total [as N], monthly average7.63≤ 2.6 mg/L193%
October 2025pH, maximum9.14≤ 9 SU—
November 2025BOD, 5-day, 20 deg. C, monthly average66≤ 45 mg/L47%
November 2025BOD, 5-day, 20 deg. C, weekly average66≤ 65 mg/L2%
November 2025Nitrogen, ammonia total [as N], daily maximum14.5≤ 12.1 mg/L20%
November 2025Nitrogen, ammonia total [as N], monthly average14.5≤ 3.1 mg/L368%
November 2025Solids, total suspended, monthly average104≤ 80 mg/L30%
December 2025Nitrogen, ammonia total [as N], daily maximum11.5≤ 10.1 mg/L14%
December 2025Nitrogen, ammonia total [as N], monthly average11.5≤ 2.7 mg/L326%
January 2026Nitrogen, ammonia total [as N], monthly average10.1≤ 3.1 mg/L226%
January 2026Solids, total suspended, monthly average87≤ 80 mg/L9%
January 2026pH, maximum9.7≤ 9 SU—
February 2026Nitrogen, ammonia total [as N], daily maximum10.4≤ 10.1 mg/L3%
February 2026Nitrogen, ammonia total [as N], monthly average10.4≤ 2.7 mg/L285%
March 2026Nitrogen, ammonia total [as N], monthly average3.88≤ 2.7 mg/L44%
April 2026E. coli, 30-day geometric mean435.2≤ 206 #/100mL111%
April 2026pH, maximum9.44≤ 9 SU—
May 2026pH, maximum9.36≤ 9 SU—
July 2026Nitrogen, ammonia total [as N], monthly average7.2≤ 1.1 mg/L555%

Limits in force (30)

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≤ 120 mg/Lall year
Solids, total suspendedmonthly average≤ 80 mg/Lall year
Oil and grease [soxhlet extr.] tot.daily maximum≤ 15 mg/Lall year
Oil and grease [soxhlet extr.] tot.monthly average≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LFeb, Mar, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 10.1 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LJan, Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.9 mg/LMay
Nitrogen, ammonia total [as N]monthly average≤ 1.7 mg/LSep
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LAug
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJun
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LApr
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LFeb, Mar, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.6 mg/LOct
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LJul
Nitrogen, ammonia total [as N]monthly average≤ 3.1 mg/LJan, Nov
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–Oct
E. coli30-day geometric mean≤ 206 #/100mLApr–Oct

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/MO0025828 · MCP: https://passage-data.com/mcp