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Illinois Power Generating Company

Electric Services, major discharger, Coffeen, Illinois. NPDES permit IL0000108 expired Sep 30, 2021; its limits still apply. 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 0 monthly (20 values), outfall 020 form 0 monthly (14 values), outfall C20 form 0 monthly (6 values), outfall D20 form 0 monthly (9 values), outfall E20 form 0 monthly (6 values), outfall K20 form 0 monthly (11 values), and 1 more form
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 74 reports late

Limits in force (152)

ParameterStatisticLimitMonthsOutfall
pHmonthly minimum≥ 6 SUall year002
pHmonthly minimum≥ 6 SUall year002
pHminimum≥ 6.5 SUall year002
pHminimum≥ 6.5 SUall year002
pHmonthly maximum≤ 9 SUall year002
pHmonthly maximum≤ 9 SUall year002
pHmaximum≤ 9 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspended30-day average≤ 35 mg/Lall year002
Solids, total suspended30-day average≤ 35 mg/Lall year002
Solids, total suspended30-day average≤ 15 mg/Lall year002
Solids, total suspended30-day average≤ 15 mg/Lall year002
Solids, total suspendeddaily maximum≤ 50 mg/Lall year002
Solids, total suspendeddaily maximum≤ 50 mg/Lall year002
Solids, total suspendeddaily maximum≤ 30 mg/Lall year002
Solids, total suspendeddaily maximum≤ 30 mg/Lall year002
Boron, total [as B]daily maximum≤ 1300 mg/Lall year002
Boron, total [as B]daily maximum≤ 1300 mg/Lall year002
Iron, total [as Fe]30-day average≤ 2 mg/Lall year002
Iron, total [as Fe]30-day average≤ 2 mg/Lall year002
Iron, total [as Fe]daily maximum≤ 4 mg/Lall year002
Iron, total [as Fe]daily maximum≤ 4 mg/Lall year002
Manganese, total [as Mn]30-day average≤ 1 mg/Lall year002
Manganese, total [as Mn]30-day average≤ 1 mg/Lall year002
Manganese, total [as Mn]daily maximum≤ 1.3 mg/Lall year002
Manganese, total [as Mn]daily maximum≤ 1.3 mg/Lall year002
Oil and grease30-day average≤ 15 mg/Lall year002
Oil and grease30-day average≤ 15 mg/Lall year002
Oil and grease30-day average≤ 15 mg/Lall year002
Oil and grease30-day average≤ 15 mg/Lall year002
Oil and greasedaily maximum≤ 20 mg/Lall year002
Oil and greasedaily maximum≤ 20 mg/Lall year002
Oil and greasedaily maximum≤ 20 mg/Lall year002
Oil and greasedaily maximum≤ 20 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 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
Solids, total dissolveddaily maximum≤ 1.8 mg/Lall year002
Solids, total dissolveddaily maximum≤ 1.8 mg/Lall year002
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jun–Sep020
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jun–Sep020
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jan, Feb, Mar, Apr, May, Oct, Nov, Dec020
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jan, Feb, Mar, Apr, May, Oct, Nov, Dec020
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jun–Sep020
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jun–Sep020
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jan, Feb, Mar, Apr, May, Oct, Nov, Dec020
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jan, Feb, Mar, Apr, May, Oct, Nov, Dec020
pHmonthly minimum≥ 6 SUall year020
pHmonthly minimum≥ 6 SUall year020
pHmonthly minimum≥ 6.5 SUall year020
pHmonthly minimum≥ 6.5 SUall year020
pHmonthly maximum≤ 9 SUall year020
pHmonthly maximum≤ 9 SUall year020
pHmonthly maximum≤ 9 SUall year020
pHmonthly maximum≤ 9 SUall year020
Chloride [as Cl]monthly averagereport only (mg/L)Jun, Dec020
Chloride [as Cl]monthly averagereport only (mg/L)Jun, Dec020
Copper, total [as Cu]30-day average≤ .017 mg/Lall year020
Copper, total [as Cu]30-day average≤ .017 mg/Lall year020
Copper, total [as Cu]daily maximum≤ .0258 mg/Lall year020
Copper, total [as Cu]daily maximum≤ .0258 mg/Lall year020
Manganese, total [as Mn]monthly averagereport only (mg/L)Jun, Dec020
Manganese, total [as Mn]monthly averagereport only (mg/L)Jun, Dec020
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year020
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year020
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year020
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year020
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year020
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year020
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year020
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year020
Chlorine, total residualinstantaneous maximum≤ .2 mg/Lall year020
Chlorine, total residualinstantaneous maximum≤ .2 mg/Lall year020
Mercury, total [as Hg]annual average≤ 12 ng/Lall year020
Mercury, total [as Hg]annual average≤ 12 ng/Lall year020
Solids, total suspended30-day average≤ 15 mg/Lall yearC20
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearC20
Oil and grease30-day average≤ 15 mg/Lall yearC20
Oil and greasedaily maximum≤ 20 mg/Lall yearC20
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearC20
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearC20
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall yearD20
BOD, 5-day, 20 deg. Cdaily maximum≤ 60 mg/Lall yearD20
pHmonthly minimum≥ 6.5 SUall yearD20
pHmonthly maximum≤ 9 SUall yearD20
Solids, total suspended30-day average≤ 37 mg/Lall yearD20
Solids, total suspendeddaily maximum≤ 74 mg/Lall yearD20
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD20
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearD20
Coliform, fecal generaldaily maximumreport only (#/100mL)all yearD20
Solids, total suspended30-day average≤ 15 mg/Lall yearE20
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearE20
Oil and grease30-day average≤ 15 mg/Lall yearE20
Oil and greasedaily maximum≤ 20 mg/Lall yearE20
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearE20
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearE20
Oil & Greasedaily maximumreport only (mg/L)all yearK02
Oil & Greasedaily maximumreport only (mg/L)all yearK02
Cyanide, total [as CN]daily maximumreport only (ug/L)all yearK02
Cyanide, total [as CN]daily maximumreport only (ug/L)all yearK02
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all yearK02
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all yearK02
Fluoride, total [as F]daily maximumreport only (mg/L)all yearK02
Fluoride, total [as F]daily maximumreport only (mg/L)all yearK02
Arsenic, total [as As]daily maximumreport only (mg/L)all yearK02
Arsenic, total [as As]daily maximumreport only (mg/L)all yearK02
Barium, total [as Ba]daily maximumreport only (mg/L)all yearK02
Barium, total [as Ba]daily maximumreport only (mg/L)all yearK02
Cadmium, total [as Cd]daily maximumreport only (mg/L)all yearK02
Cadmium, total [as Cd]daily maximumreport only (mg/L)all yearK02
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all yearK02
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all yearK02
Chromium, total [as Cr]daily maximumreport only (mg/L)all yearK02
Chromium, total [as Cr]daily maximumreport only (mg/L)all yearK02
Copper, total [as Cu]daily maximumreport only (mg/L)all yearK02
Copper, total [as Cu]daily maximumreport only (mg/L)all yearK02
Iron, total [as Fe]daily maximumreport only (mg/L)all yearK02
Iron, total [as Fe]daily maximumreport only (mg/L)all yearK02
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all yearK02
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all yearK02
Lead, total [as Pb]daily maximumreport only (mg/L)all yearK02
Lead, total [as Pb]daily maximumreport only (mg/L)all yearK02
Manganese, total [as Mn]daily maximumreport only (mg/L)all yearK02
Manganese, total [as Mn]daily maximumreport only (mg/L)all yearK02
Nickel, total [as Ni]daily maximumreport only (mg/L)all yearK02
Nickel, total [as Ni]daily maximumreport only (mg/L)all yearK02
Silver, total [as Ag]daily maximumreport only (mg/L)all yearK02
Silver, total [as Ag]daily maximumreport only (mg/L)all yearK02
Zinc, total [as Zn]daily maximumreport only (mg/L)all yearK02
Zinc, total [as Zn]daily maximumreport only (mg/L)all yearK02
Selenium, total [as Se]daily maximumreport only (mg/L)all yearK02
Selenium, total [as Se]daily maximumreport only (mg/L)all yearK02
Phenolics, total recoverabledaily maximumreport only (mg/L)all yearK02
Phenolics, total recoverabledaily maximumreport only (mg/L)all yearK02
Mercury, total [as Hg]daily maximumreport only (ng/L)all yearK02
Mercury, total [as Hg]daily maximumreport only (ng/L)all yearK02
Sulfate [as S]30-day averagereport only (mg/L)all yearK20
Sulfate [as S]daily maximumreport only (mg/L)all yearK20
pHmonthly minimum≥ 6.5 SUall yearK20
pHmonthly maximum≤ 9 SUall yearK20
Solids, total suspended30-day average≤ 15 mg/Lall yearK20
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearK20
Boron, total [as B]30-day averagereport only (mg/L)all yearK20
Boron, total [as B]daily maximumreport only (mg/L)all yearK20
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearK20
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearK20
Solids, total dissolveddaily maximum≤ 500 mg/Lall yearK20

How strict are these limits?

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

Same industry: the 45 Electric Services permits in Illinois.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IL0000108 · MCP: https://passage-data.com/mcp