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Missouri-American Water Company

Sewage treatment plant, Orrick, Missouri. NPDES permit MO0022918 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit 27 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form M monthly (14 values), outfall 001 form Q quarterly (6 values), outfall INF form IQ quarterly (8 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
18 values over a limit, 0 required values missing, 0 of 20 reports late

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

All 27 values over a limit
Period endingParameterReportedLimitOver by
October 2025E. coli, daily maximum1553.1≤ 1030 #/100mL51%
October 2025Solids, total suspended, monthly average125≤ 70 mg/L79%
October 2025Solids, total suspended, weekly average125≤ 110 mg/L14%
November 2025Solids, total suspended, monthly average114≤ 70 mg/L63%
November 2025Solids, total suspended, weekly average114≤ 110 mg/L4%
December 2025Nitrogen, ammonia total [as N], daily maximum9.9≤ 8.4 mg/L18%
December 2025Nitrogen, ammonia total [as N], monthly average9.9≤ 2.4 mg/L313%
January 2026Nitrogen, ammonia total [as N], daily maximum10.9≤ 8.4 mg/L30%
January 2026Nitrogen, ammonia total [as N], monthly average10.9≤ 2.4 mg/L354%
February 2026BOD, 5-day, 20 deg. C, monthly average49≤ 45 mg/L9%
February 2026Nitrogen, ammonia total [as N], daily maximum10.5≤ 8.4 mg/L25%
February 2026Nitrogen, ammonia total [as N], monthly average10.5≤ 2.4 mg/L338%
February 2026Solids, total suspended, monthly average71≤ 70 mg/L1%
March 2026BOD, 5-day, 20 deg. C, monthly average46≤ 45 mg/L2%
March 2026Nitrogen, ammonia total [as N], monthly average6.37≤ 2.4 mg/L165%
March 2026Solids, total suspended, monthly average108≤ 70 mg/L54%
April 2026E. coli, daily maximum1986.3≤ 1030 #/100mL93%
April 2026Solids, total suspended, monthly average202≤ 70 mg/L189%
April 2026Solids, total suspended, weekly average202≤ 110 mg/L84%
May 2026E. coli, 30-day geometric mean434.9≤ 206 #/100mL111%
May 2026E. coli, daily maximum1986.3≤ 1030 #/100mL93%
May 2026Solids, total suspended, monthly average133≤ 70 mg/L90%
May 2026Solids, total suspended, weekly average133≤ 110 mg/L21%
June 2026Solids, total suspended, monthly average80≤ 70 mg/L14%
July 2026Nitrogen, ammonia total [as N], monthly average1.04≤ .8 mg/L30%
July 2026Solids, total suspended, monthly average84≤ 70 mg/L20%
August 2026Solids, total suspended, monthly average94≤ 70 mg/L34%

Limits in force (42)

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≤ 110 mg/Lall year001
Solids, total suspendedmonthly average≤ 70 mg/Lall year001
Oil and grease [soxhlet extr.] tot.daily maximum≤ 15 mg/Lall year001
Oil and grease [soxhlet extr.] tot.monthly average≤ 10 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 7.6 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 1.9 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 2.4 mg/LJan, Feb, Mar, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.6 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ .8 mg/LJul001
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. colidaily maximum≤ 1030 #/100mLApr–Oct001
E. coli30-day geometric mean≤ 206 #/100mLApr–Oct001
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

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/MO0022918 · MCP: https://passage-data.com/mcp