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Missouri-American Water Company

Sewage treatment plant, major discharger, Eureka, Missouri. NPDES permit MO0039659 expired Sep 30, 2022; its limits still apply. Last 12 months: over a limit 2 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 004 form A monthly (14 values), outfall 004 form B quarterly (18 values), outfall SM1 form A quarterly (4 values), outfall SM2 form A quarterly (2 values), outfall 004 form WA yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 25 reports late

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

Period endingParameterReportedLimitOver by
November 2025BOD, 5-day, 20 deg. C, monthly average34≤ 30 mg/L13%
June 2026E. coli, daily maximum2419.6≤ 630 #/100mL284%

Limits in force (40)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year004
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year004
pHminimum≥ 6 SUall year004
pHmaximum≤ 9 SUall year004
Solids, total suspendedweekly average≤ 45 mg/Lall year004
Solids, total suspendedmonthly average≤ 30 mg/Lall year004
Oil and grease [soxhlet extr.] tot.daily maximum≤ 15 mg/Lall year004
Oil and grease [soxhlet extr.] tot.monthly average≤ 10 mg/Lall year004
Nitrogen, total [as N]daily maximumreport only (mg/L)all year004
Nitrogen, total [as N]monthly averagereport only (mg/L)all year004
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year004
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year004
Phosphorus, total [as P]daily maximumreport only (mg/L)all year004
Phosphorus, total [as P]monthly averagereport only (mg/L)all year004
Nickel, total recoverabledaily maximumreport only (ug/L)all year004
Nickel, total recoverablemonthly averagereport only (ug/L)all year004
Zinc, total recoverabledaily maximumreport only (ug/L)all year004
Zinc, total recoverablemonthly averagereport only (ug/L)all year004
Cadmium, total recoverabledaily maximumreport only (ug/L)all year004
Cadmium, total recoverablemonthly averagereport only (ug/L)all year004
Lead, total recoverabledaily maximumreport only (ug/L)all year004
Lead, total recoverablemonthly averagereport only (ug/L)all year004
Copper, total recoverabledaily maximumreport only (ug/L)all year004
Copper, total recoverablemonthly averagereport only (ug/L)all year004
Chromium, hexavalent dissolved [as Cr]daily maximumreport only (ug/L)all year004
Chromium, hexavalent dissolved [as Cr]monthly averagereport only (ug/L)all year004
Chromium, trivalent total recoverabledaily maximumreport only (ug/L)all year004
Chromium, trivalent total recoverablemonthly averagereport only (ug/L)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
E. colidaily maximum≤ 630 #/100mLApr–Oct004
E. coli30-day geometric mean≤ 126 #/100mLApr–Oct004
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (toxic)all year004
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximumreport only (toxic)all year004
Nitrogen, total [as N]daily maximumreport only (mg/L)all yearSM1
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearSM1
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearSM1
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearSM1
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all yearSM2
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all yearSM2

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/MO0039659 · MCP: https://passage-data.com/mcp