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Union Electric Company d/b/a Ameren MO

Electric Services, major discharger, Labadie, Missouri. NPDES permit MO0004812, in force until Nov 30, 2026. Last 12 months: over a limit once (last July 2026), 28 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form T monthly (12 values), outfall 001 form TV monthly (6 values), outfall 004 form Q quarterly (6 values), outfall 005 form Q quarterly (6 values), outfall 010 form M monthly (10 values), outfall 011 form Q quarterly (6 values), and 7 more forms
Renewal application due
Jun 3, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 44 required values missing, 4 of 86 reports late

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

Period endingParameterReportedLimit
July 2026Thermal Discharge, ratio, daily maximum1.19≤ .95 #

Limits in force (95)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)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
Flow, in conduit or thru treatment plantdaily maximumreport only (cfs)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (cfs)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (cfs)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (cfs)all year001
Thermal Discharge, ratiodaily maximum≤ .95 #all year001
Thermal Discharge, ratiodaily maximumreport only (#)all year001
Thermal Discharge, ratiomonthly averagereport only (#)all year001
Thermal Discharge, ratiomonthly averagereport only (#)all year001
Mixing Zonedaily maximumreport only (%)all year001
Mixing Zonemonthly averagereport only (%)all year001
Mixing Zonedaily maximum≤ 40 %all year001
Mixing Zonemonthly averagereport only (%)all year001
Month excursion time [min]monthly totalreport only (hr)all year001
Month excursion time [min]annual total≤ 528 hrall year001
Month excursion time [min]year-to-date totalreport only (hr)all year001
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year004
pHminimumreport only (SU)all year004
pHmaximumreport only (SU)all year004
Solids, total suspendeddaily maximumreport only (mg/L)all year004
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year005
pHminimumreport only (SU)all year005
pHmaximumreport only (SU)all year005
Solids, total suspendeddaily maximumreport only (mg/L)all year005
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year010
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year010
Flow ratedaily maximumreport only (cfs)all year010
Flow ratemonthly averagereport only (cfs)all year010
Solids, total suspendeddaily maximumreport only (mg/L)all year010
Solids, total suspendedmonthly averagereport only (mg/L)all year010
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year010
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year010
Flow, in conduit or thru treatment plantdaily maximumreport only (cfs)all year010
Flow, in conduit or thru treatment plantmonthly averagereport only (cfs)all year010
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year011
pHminimumreport only (SU)all year011
pHmaximumreport only (SU)all year011
Solids, total suspendeddaily maximumreport only (mg/L)all year011
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year011
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year011
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year012
pHminimumreport only (SU)all year012
pHmaximumreport only (SU)all year012
Solids, total suspendeddaily maximumreport only (mg/L)all year012
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year012
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year012
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year02A
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year02A
pHminimum≥ 6 SUall year02A
pHmaximum≤ 9 SUall year02A
Solids, total suspendeddaily maximum≤ 45 mg/Lall year02A
Solids, total suspendedmonthly average≤ 30 mg/Lall year02A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year02A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year02A
E. colidaily maximum≤ 1030 #/100mLApr–Dec02A
E. coli30-day geometric mean≤ 206 #/100mLApr–Dec02A
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year02B
Oxygen demand, chem. [high level] [COD]monthly averagereport only (mg/L)all year02B
pHminimum≥ 6 SUall year02B
pHmaximum≤ 9 SUall year02B
Solids, total suspendeddaily maximumreport only (mg/L)all year02B
Solids, total suspendedmonthly averagereport only (mg/L)all year02B
Solids, total suspendeddaily maximum≤ 100 mg/Lall year02B
Solids, total suspendedmonthly average≤ 30 mg/Lall year02B
Oil and grease [soxhlet extr.] tot.daily maximum≤ 15 mg/Lall year02B
Oil and grease [soxhlet extr.] tot.monthly average≤ 10 mg/Lall year02B
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year02B
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year02B
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year02B
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year02B
Phosphorus, total [as P]daily maximumreport only (mg/L)all year02B
Phosphorus, total [as P]monthly averagereport only (mg/L)all year02B
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year02B
Sulfate, total [as SO4]monthly averagereport only (mg/L)all year02B
Boron, total recoverabledaily maximumreport only (ug/L)all year02B
Boron, total recoverablemonthly averagereport only (ug/L)all year02B
Chloridedaily maximumreport only (mg/L)all year02B
Chloridemonthly averagereport only (mg/L)all year02B
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year02B
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year02B
Nitrogen, Kjeldahl, total [TKN] [water]daily maximumreport only (mg/L)all year02B
Nitrogen, Kjeldahl, total [TKN] [water]monthly averagereport only (mg/L)all year02B
Toxicity [acute], Ceriodaphnia dubiavalue≤ 3.3 toxicall year02B
Toxicity [acute], Pimephales promelas [Fathead Minnow]value≤ 3.3 toxicall year02B
Chlorides + Sulfatesdaily maximumreport only (mg/L)all year02B
Chlorides + Sulfatesmonthly averagereport only (mg/L)all year02B
Freeboardminimumreport only (ft)all year02C
Freeboardaveragereport only (ft)all year02C

How strict are these limits?

Cited limits by parameter: Missouri's rules and the federal ones.

Same industry: the 29 Electric Services permits in Missouri.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MO0004812 · MCP: https://passage-data.com/mcp