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Aep Generating Company

Bituminous Coal And Lignite - Surface, Metropolis, Illinois. NPDES permit IL0042773, in force until May 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 002 form 1 quarterly (30 values), outfall 002 form 2 quarterly (16 values), outfall 002 form 3 quarterly (14 values), outfall 002 form 4 quarterly (30 values), outfall 004 form ES yearly, outfall 005 form ES yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 36 reports late

Limits in force (102)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6 SUall year002
pHminimum≥ 6 SUall year002
pHminimum≥ 6.5 SUall year002
pHminimum≥ 6.5 SUall year002
pHquarterly minimum≥ 6 SUall year002
pHquarterly minimum≥ 6 SUall year002
pHquarterly minimum≥ 6 SUall year002
pHquarterly minimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
pHmaximum≤ 9 SUall year002
pHmaximum≤ 9 SUall year002
pHmaximum≤ 9 SUall year002
pHquarterly maximum≤ 9 SUall year002
pHquarterly maximum≤ 9 SUall year002
pHquarterly maximum≤ 9 SUall year002
pHquarterly maximum≤ 9 SUall year002
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all year002
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all year002
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all year002
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all year002
Acidity, total [as CaCO3]daily maximumreport only (mg/L)all year002
Acidity, total [as CaCO3]daily maximumreport only (mg/L)all year002
Acidity, total [as CaCO3]daily maximumreport only (mg/L)all year002
Acidity, total [as CaCO3]daily maximumreport only (mg/L)all year002
Solids, total suspended30-day average≤ 35 mg/Lall year002
Solids, total suspended30-day average≤ 35 mg/Lall year002
Solids, total suspended30-day average≤ 35 mg/Lall year002
Solids, total suspended30-day average≤ 35 mg/Lall year002
Solids, total suspendeddaily maximum≤ 70 mg/Lall year002
Solids, total suspendeddaily maximum≤ 70 mg/Lall year002
Solids, total suspendeddaily maximum≤ 70 mg/Lall year002
Solids, total suspendeddaily maximum≤ 70 mg/Lall year002
Solids, settleablequarterly maximum≤ .5 mL/Lall year002
Solids, settleablequarterly maximum≤ .5 mL/Lall year002
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year002
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year002
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year002
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year002
Hardness, total [as CaCO3]quarterly maximumreport only (mg/L)all year002
Hardness, total [as CaCO3]quarterly maximumreport only (mg/L)all year002
Hardness, total [as CaCO3]quarterly maximumreport only (mg/L)all year002
Hardness, total [as CaCO3]quarterly maximumreport only (mg/L)all year002
Chloride [as Cl]daily maximum≤ 500 mg/Lall year002
Chloride [as Cl]daily maximum≤ 500 mg/Lall year002
Chloride [as Cl]daily maximum≤ 500 mg/Lall year002
Chloride [as Cl]daily maximum≤ 500 mg/Lall year002
Chloride [as Cl]quarterly maximum≤ 500 mg/Lall year002
Chloride [as Cl]quarterly maximum≤ 500 mg/Lall year002
Chloride [as Cl]quarterly maximum≤ 500 mg/Lall year002
Chloride [as Cl]quarterly maximum≤ 500 mg/Lall year002
Sulfate, total [as SO4]daily maximum≤ 1300 mg/Lall year002
Sulfate, total [as SO4]daily maximum≤ 1300 mg/Lall year002
Sulfate, total [as SO4]daily maximum≤ 1300 mg/Lall year002
Sulfate, total [as SO4]daily maximum≤ 1300 mg/Lall year002
Sulfate, total [as SO4]quarterly maximum≤ 1300 mg/Lall year002
Sulfate, total [as SO4]quarterly maximum≤ 1300 mg/Lall year002
Sulfate, total [as SO4]quarterly maximum≤ 1300 mg/Lall year002
Sulfate, total [as SO4]quarterly maximum≤ 1300 mg/Lall year002
Iron, total [as Fe]30-day average≤ 3.5 mg/Lall year002
Iron, total [as Fe]30-day average≤ 3.5 mg/Lall year002
Iron, total [as Fe]30-day average≤ 3.5 mg/Lall year002
Iron, total [as Fe]30-day average≤ 3.5 mg/Lall year002
Iron, total [as Fe]daily maximum≤ 7 mg/Lall year002
Iron, total [as Fe]daily maximum≤ 7 mg/Lall year002
Iron, total [as Fe]daily maximum≤ 7 mg/Lall year002
Iron, total [as Fe]daily maximum≤ 7 mg/Lall year002
Manganese, total [as Mn]30-day average≤ 2 mg/Lall year002
Manganese, total [as Mn]30-day average≤ 2 mg/Lall year002
Manganese, total [as Mn]30-day average≤ 2 mg/Lall year002
Manganese, total [as Mn]30-day average≤ 2 mg/Lall year002
Manganese, total [as Mn]daily maximum≤ 4 mg/Lall year002
Manganese, total [as Mn]daily maximum≤ 4 mg/Lall year002
Manganese, total [as Mn]daily maximum≤ 4 mg/Lall year002
Manganese, total [as Mn]daily maximum≤ 4 mg/Lall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
pHminimum≥ 6 SUall year004
pHminimum≥ 6 SUall year004
pHmaximum≤ 9 SUall year004
pHmaximum≤ 9 SUall year004
Solids, settleableannual maximum≤ .5 mL/Lall year004
Solids, settleableannual maximum≤ .5 mL/Lall year004
pHminimum≥ 6 SUall year005
pHminimum≥ 6 SUall year005
pHmaximum≤ 9 SUall year005
pHmaximum≤ 9 SUall year005
Solids, settleableannual maximum≤ .5 mL/Lall year005
Solids, settleableannual maximum≤ .5 mL/Lall year005

How strict are these limits?

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

Same industry: the 56 Coal Mining permits in Illinois.

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Your permit document is the final word. As JSON: /api/v1/permits/IL0042773 · MCP: https://passage-data.com/mcp