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Union Electric Company d/b/a Ameren MO

Electric Services, major discharger, Festus, Missouri. NPDES permit MO0000043 expired Feb 29, 2024; its limits still apply. Last 12 months: no values over a limit, 30 of 79 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (13 values), outfall 003 form A quarterly (12 values), outfall 009 form A monthly (22 values), outfall 011 form Q quarterly (7 values), outfall 012 form Q quarterly (7 values), outfall 013 form Q quarterly (7 values), and 12 more forms
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 94 reports late

Limits in force (162)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year001
Temperature, water deg. fahrenheitdaily maximum≤ 63 deg FMar001
Temperature, water deg. fahrenheitdaily maximum≤ 60 deg FDec001
Temperature, water deg. fahrenheitdaily maximum≤ 92 deg FJul, Aug001
Temperature, water deg. fahrenheitdaily maximum≤ 90 deg FJun, Sep001
Temperature, water deg. fahrenheitdaily maximum≤ 53 deg FFeb001
Temperature, water deg. fahrenheitdaily maximum≤ 81 deg FOct001
Temperature, water deg. fahrenheitdaily maximum≤ 83 deg FMay001
Temperature, water deg. fahrenheitdaily maximum≤ 53 deg FJan001
Temperature, water deg. fahrenheitdaily maximum≤ 73 deg FApr, Nov001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Mar001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Dec001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jul, Aug001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jun, Sep001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Feb001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Oct001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)May001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jan001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Apr, Nov001
Flow ratedaily maximumreport only (cfs)all year001
Flow ratemonthly averagereport only (cfs)all year001
Temp. diff. between up/down stream deg. Fdaily maximum≤ 5 deg Fall year001
Temp. diff. between up/down stream deg. Fmonthly 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
Chlorine, total residualdaily maximum≤ 200 ug/Lall year001
Chlorine, free availabledaily maximum≤ 500 ug/Lall year001
Chlorine, free availablemonthly average≤ 200 ug/Lall year001
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (toxic)all year001
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximumreport only (toxic)all year001
Flow, process wastewaterdaily maximumreport only (cfs)all year001
Flow, process wastewatermonthly averagereport only (cfs)all year001
Month excursion time [min]annual total≤ 87.6 hrall year001
Month excursion time [min]monthly totalreport only (hr)all year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year003
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year003
pHminimum≥ 6 SUall year003
pHmaximum≤ 9 SUall year003
Solids, total suspendeddaily maximum≤ 45 mg/Lall year003
Solids, total suspendedmonthly average≤ 30 mg/Lall year003
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year003
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
E. colidaily maximum≤ 630 #/100mLApr–Dec003
E. coli30-day geometric mean≤ 126 #/100mLApr–Dec003
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year009
Oxygen demand, chem. [high level] [COD]monthly averagereport only (mg/L)all year009
pHminimum≥ 6 SUall year009
pHmaximum≤ 9 SUall year009
Solids, total suspendeddaily maximum≤ 50 mg/Lall year009
Solids, total suspendedmonthly average≤ 50 mg/Lall year009
Oil and grease [soxhlet extr.] tot.daily maximum≤ 15 mg/Lall year009
Oil and grease [soxhlet extr.] tot.monthly average≤ 10 mg/Lall year009
Nitrogen, total [as N]daily maximumreport only (mg/L)all year009
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year009
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year009
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year009
Phosphorus, total [as P]daily maximumreport only (mg/L)all year009
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year009
Iron, total recoverabledaily maximumreport only (ug/L)all year009
Boron, total recoverabledaily maximumreport only (ug/L)all year009
Aluminum, total recoverabledaily maximumreport only (ug/L)all year009
Molybdenum, total recoverabledaily maximumreport only (ug/L)all year009
Chloridedaily maximumreport only (mg/L)all year009
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year009
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year009
Chlorides + Sulfatesdaily maximumreport only (mg/L)all year009
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 maximum≤ 150 mg/Lall year011
Solids, settleabledaily maximum≤ 1.5 mL/Lall 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 maximum≤ 150 mg/Lall year012
Solids, settleabledaily maximum≤ 1.5 mL/Lall 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
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year013
pHminimumreport only (SU)all year013
pHmaximumreport only (SU)all year013
Solids, total suspendeddaily maximum≤ 150 mg/Lall year013
Solids, settleabledaily maximum≤ 1.5 mL/Lall year013
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year013
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year013
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year014
pHminimumreport only (SU)all year014
pHmaximumreport only (SU)all year014
Solids, total suspendeddaily maximum≤ 150 mg/Lall year014
Solids, settleabledaily maximum≤ 1.5 mL/Lall year014
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year014
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year014
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year015
pHminimumreport only (SU)all year015
pHmaximumreport only (SU)all year015
Solids, total suspendeddaily maximum≤ 150 mg/Lall year015
Solids, settleabledaily maximum≤ 1.5 mg/Lall year015
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year015
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year015
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year016
pHminimumreport only (SU)all year016
pHmaximumreport only (SU)all year016
Solids, total suspendeddaily maximum≤ 150 mg/Lall year016
Solids, settleabledaily maximum≤ 1.5 mL/Lall year016
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year016
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year016
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year017
pHminimumreport only (SU)all year017
pHmaximumreport only (SU)all year017
Solids, total suspendeddaily maximum≤ 150 mg/Lall year017
Solids, settleabledaily maximum≤ 1.5 mL/Lall year017
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year017
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year017
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year018
pHminimumreport only (SU)all year018
pHmaximumreport only (SU)all year018
Solids, total suspendeddaily maximum≤ 150 mg/Lall year018
Solids, settleabledaily maximum≤ 1.5 mL/Lall year018
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year018
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year018
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year019
pHminimumreport only (SU)all year019
pHmaximumreport only (SU)all year019
Solids, total suspendeddaily maximum≤ 150 mg/Lall year019
Solids, settleabledaily maximum≤ 1.5 mL/Lall year019
Oil and grease [soxhlet extr.] tot.daily maximumreport only (mg/L)all year019
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year019
Oxygen demand, chem. [high level] [COD]daily maximumreport only (mg/L)all year01A
Oxygen demand, chem. [high level] [COD]monthly averagereport only (mg/L)all year01A
pHminimum≥ 6 SUall year01A
pHmaximum≤ 9 SUall year01A
Solids, total suspendeddaily maximumreport only (mg/L)all year01A
Solids, total suspendedmonthly averagereport only (mg/L)all year01A
Solids, total suspendeddaily maximum≤ 100 mg/Lall year01A
Solids, total suspendedmonthly average≤ 30 mg/Lall year01A
Oil and grease [soxhlet extr.] tot.daily maximum≤ 15 mg/Lall year01A
Oil and grease [soxhlet extr.] tot.monthly average≤ 10 mg/Lall year01A
Nitrogen, total [as N]daily maximumreport only (mg/L)all year01A
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year01A
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year01A
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year01A
Phosphorus, total [as P]daily maximumreport only (mg/L)all year01A
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year01A
Iron, total recoverabledaily maximumreport only (ug/L)all year01A
Boron, total recoverabledaily maximumreport only (ug/L)all year01A
Aluminum, total recoverabledaily maximumreport only (ug/L)all year01A
Molybdenum, total recoverabledaily maximumreport only (ug/L)all year01A
Chloridedaily maximumreport only (mg/L)all year01A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year01A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year01A
Toxicity [chronic], Ceriodaphnia dubiavaluereport only (toxic)all year01A
Toxicity [chronic], Pimephales promelas [Fathead Minnow]valuereport only (toxic)all year01A
Chlorides + Sulfatesdaily maximumreport only (mg/L)all year01A
Solids, total suspendeddaily maximum≤ 50 mg/Lall year09A
Solids, total suspendedmonthly average≤ 50 mg/Lall year09A
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year09A
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year09A

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/MO0000043 · MCP: https://passage-data.com/mcp