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Midwest Generation, LLC

Electric Services, major discharger, Joliet, Illinois. NPDES permit IL0002216, in force until Sep 30, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (8 values), outfall 003 form 0 monthly (8 values), outfall 004 form 0 monthly (6 values), outfall 005 form 0 monthly (8 values), outfall B01 form 0 monthly (6 values), outfall 001 form S twice a year, and 3 more forms
Renewal application due
Apr 3, 2028 · 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, 0 required values missing, 0 of 68 reports late

Limits in force (201)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly maximum≤ 68 deg FJan, Feb001
Temperature, water deg. fahrenheitmonthly maximum≤ 73 deg FMar, Dec001
Temperature, water deg. fahrenheitmonthly maximum≤ 83 deg FApr001
Temperature, water deg. fahrenheitmonthly maximum≤ 88 deg FMay, Nov001
Temperature, water deg. fahrenheitmonthly maximum≤ 96 deg FJun–Sep001
Temperature, water deg. fahrenheitmonthly maximum≤ 93 deg FOct001
pHmonthly minimum≥ 6 SUall year001
pHmonthly maximum≤ 9 SUall year001
Oil & Greasedaily maximumreport only (mg/L)all year001
Oil & Greasedaily maximumreport only (mg/L)all year001
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year001
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year001
Cyanide, total [as CN]daily maximumreport only (ug/L)all year001
Cyanide, total [as CN]daily maximumreport only (ug/L)all year001
Fluoride, total [as F]daily maximumreport only (mg/L)all year001
Fluoride, total [as F]daily maximumreport only (mg/L)all year001
Arsenic, total [as As]daily maximumreport only (mg/L)all year001
Arsenic, total [as As]daily maximumreport only (mg/L)all year001
Barium, total [as Ba]daily maximumreport only (mg/L)all year001
Barium, total [as Ba]daily maximumreport only (mg/L)all year001
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year001
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year001
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year001
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year001
Chromium, total [as Cr]daily maximumreport only (mg/L)all year001
Chromium, total [as Cr]daily maximumreport only (mg/L)all year001
Copper, total [as Cu]daily maximumreport only (mg/L)all year001
Copper, total [as Cu]daily maximumreport only (mg/L)all year001
Iron, total [as Fe]daily maximumreport only (mg/L)all year001
Iron, total [as Fe]daily maximumreport only (mg/L)all year001
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year001
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year001
Lead, total [as Pb]daily maximumreport only (mg/L)all year001
Lead, total [as Pb]daily maximumreport only (mg/L)all year001
Manganese, total [as Mn]daily maximumreport only (mg/L)all year001
Manganese, total [as Mn]daily maximumreport only (mg/L)all year001
Nickel, total [as Ni]daily maximumreport only (mg/L)all year001
Nickel, total [as Ni]daily maximumreport only (mg/L)all year001
Silver, total [as Ag]daily maximumreport only (mg/L)all year001
Silver, total [as Ag]daily maximumreport only (mg/L)all year001
Zinc, total [as Zn]daily maximumreport only (mg/L)all year001
Zinc, total [as Zn]daily maximumreport only (mg/L)all year001
Selenium, total [as Se]daily maximumreport only (mg/L)all year001
Selenium, total [as Se]daily maximumreport only (mg/L)all year001
Phenolics, total recoverabledaily maximumreport only (mg/L)all year001
Phenolics, total recoverabledaily maximumreport only (mg/L)all year001
Temperature, length of excursionannual total≤ 438 hr/12moall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .05 mg/Lall year001
Mercury, total [as Hg]daily maximumreport only (ng/L)Mar, Jun, Sep, Dec001
Mercury, total [as Hg]daily maximumreport only (ng/L)all year001
Mercury, total [as Hg]daily maximumreport only (ng/L)all year001
pHmonthly minimum≥ 6 SUall year003
pHmonthly maximum≤ 9 SUall year003
Solids, total suspended30-day average≤ 15 mg/Lall year003
Solids, total suspendeddaily maximum≤ 30 mg/Lall year003
Oil & Grease30-day average≤ 15 mg/Lall year003
Oil & Greasedaily maximum≤ 20 mg/Lall year003
Oil & Greasedaily maximumreport only (mg/L)all year003
Oil & Greasedaily maximumreport only (mg/L)all year003
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year003
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year003
Cyanide, total [as CN]daily maximumreport only (ug/L)all year003
Cyanide, total [as CN]daily maximumreport only (ug/L)all year003
Fluoride, total [as F]daily maximumreport only (mg/L)all year003
Fluoride, total [as F]daily maximumreport only (mg/L)all year003
Arsenic, total [as As]daily maximumreport only (mg/L)all year003
Arsenic, total [as As]daily maximumreport only (mg/L)all year003
Barium, total [as Ba]daily maximumreport only (mg/L)all year003
Barium, total [as Ba]daily maximumreport only (mg/L)all year003
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year003
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year003
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year003
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year003
Chromium, total [as Cr]daily maximumreport only (mg/L)all year003
Chromium, total [as Cr]daily maximumreport only (mg/L)all year003
Copper, total [as Cu]daily maximumreport only (mg/L)all year003
Copper, total [as Cu]daily maximumreport only (mg/L)all year003
Iron, total [as Fe]daily maximumreport only (mg/L)all year003
Iron, total [as Fe]daily maximumreport only (mg/L)all year003
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year003
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year003
Lead, total [as Pb]daily maximumreport only (mg/L)all year003
Lead, total [as Pb]daily maximumreport only (mg/L)all year003
Manganese, total [as Mn]daily maximumreport only (mg/L)all year003
Manganese, total [as Mn]daily maximumreport only (mg/L)all year003
Nickel, total [as Ni]daily maximumreport only (mg/L)all year003
Nickel, total [as Ni]daily maximumreport only (mg/L)all year003
Silver, total [as Ag]daily maximumreport only (mg/L)all year003
Silver, total [as Ag]daily maximumreport only (mg/L)all year003
Zinc, total [as Zn]daily maximumreport only (mg/L)all year003
Zinc, total [as Zn]daily maximumreport only (mg/L)all year003
Selenium, total [as Se]daily maximumreport only (mg/L)all year003
Selenium, total [as Se]daily maximumreport only (mg/L)all year003
Phenolics, total recoverabledaily maximumreport only (mg/L)all year003
Phenolics, total recoverabledaily maximumreport only (mg/L)all year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Mercury, total [as Hg]daily maximumreport only (ng/L)all year003
Mercury, total [as Hg]daily maximumreport only (ng/L)all year003
pHmonthly minimum≥ 6 SUall year004
pHmonthly maximum≤ 9 SUall year004
Solids, total suspended30-day average≤ 15 mg/Lall year004
Solids, total suspendeddaily maximum≤ 30 mg/Lall year004
Oil & Greasedaily maximumreport only (mg/L)all year004
Oil & Greasedaily maximumreport only (mg/L)all year004
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year004
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year004
Cyanide, total [as CN]daily maximumreport only (ug/L)all year004
Cyanide, total [as CN]daily maximumreport only (ug/L)all year004
Fluoride, total [as F]daily maximumreport only (mg/L)all year004
Fluoride, total [as F]daily maximumreport only (mg/L)all year004
Arsenic, total [as As]daily maximumreport only (mg/L)all year004
Arsenic, total [as As]daily maximumreport only (mg/L)all year004
Barium, total [as Ba]daily maximumreport only (mg/L)all year004
Barium, total [as Ba]daily maximumreport only (mg/L)all year004
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year004
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year004
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year004
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year004
Chromium, total [as Cr]daily maximumreport only (mg/L)all year004
Chromium, total [as Cr]daily maximumreport only (mg/L)all year004
Copper, total [as Cu]daily maximumreport only (mg/L)all year004
Copper, total [as Cu]daily maximumreport only (mg/L)all year004
Iron, total [as Fe]daily maximumreport only (mg/L)all year004
Iron, total [as Fe]daily maximumreport only (mg/L)all year004
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year004
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year004
Lead, total [as Pb]daily maximumreport only (mg/L)all year004
Lead, total [as Pb]daily maximumreport only (mg/L)all year004
Manganese, total [as Mn]daily maximumreport only (mg/L)all year004
Manganese, total [as Mn]daily maximumreport only (mg/L)all year004
Nickel, total [as Ni]daily maximumreport only (mg/L)all year004
Nickel, total [as Ni]daily maximumreport only (mg/L)all year004
Silver, total [as Ag]daily maximumreport only (mg/L)all year004
Silver, total [as Ag]daily maximumreport only (mg/L)all year004
Zinc, total [as Zn]daily maximumreport only (mg/L)all year004
Zinc, total [as Zn]daily maximumreport only (mg/L)all year004
Selenium, total [as Se]daily maximumreport only (mg/L)all year004
Selenium, total [as Se]daily maximumreport only (mg/L)all year004
Phenolics, total recoverabledaily maximumreport only (mg/L)all year004
Phenolics, total recoverabledaily maximumreport only (mg/L)all year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
Mercury, total [as Hg]daily maximumreport only (ng/L)all year004
Mercury, total [as Hg]daily maximumreport only (ng/L)all year004
pHmonthly minimum≥ 6 SUall year005
pHmonthly maximum≤ 9 SUall year005
Solids, total suspended30-day average≤ 15 mg/Lall year005
Solids, total suspendeddaily maximum≤ 30 mg/Lall year005
Oil & Grease30-day average≤ 15 mg/Lall year005
Oil & Greasedaily maximum≤ 20 mg/Lall year005
Oil & Greasedaily maximumreport only (mg/L)all year005
Oil & Greasedaily maximumreport only (mg/L)all year005
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year005
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year005
Cyanide, total [as CN]daily maximumreport only (ug/L)all year005
Cyanide, total [as CN]daily maximumreport only (ug/L)all year005
Fluoride, total [as F]daily maximumreport only (mg/L)all year005
Fluoride, total [as F]daily maximumreport only (mg/L)all year005
Arsenic, total [as As]daily maximumreport only (mg/L)all year005
Arsenic, total [as As]daily maximumreport only (mg/L)all year005
Barium, total [as Ba]daily maximumreport only (mg/L)all year005
Barium, total [as Ba]daily maximumreport only (mg/L)all year005
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year005
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year005
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year005
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year005
Chromium, total [as Cr]daily maximumreport only (mg/L)all year005
Chromium, total [as Cr]daily maximumreport only (mg/L)all year005
Copper, total [as Cu]daily maximumreport only (mg/L)all year005
Copper, total [as Cu]daily maximumreport only (mg/L)all year005
Iron, total [as Fe]daily maximumreport only (mg/L)all year005
Iron, total [as Fe]daily maximumreport only (mg/L)all year005
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year005
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year005
Lead, total [as Pb]daily maximumreport only (mg/L)all year005
Lead, total [as Pb]daily maximumreport only (mg/L)all year005
Manganese, total [as Mn]daily maximumreport only (mg/L)all year005
Manganese, total [as Mn]daily maximumreport only (mg/L)all year005
Nickel, total [as Ni]daily maximumreport only (mg/L)all year005
Nickel, total [as Ni]daily maximumreport only (mg/L)all year005
Silver, total [as Ag]daily maximumreport only (mg/L)all year005
Silver, total [as Ag]daily maximumreport only (mg/L)all year005
Zinc, total [as Zn]daily maximumreport only (mg/L)all year005
Zinc, total [as Zn]daily maximumreport only (mg/L)all year005
Selenium, total [as Se]daily maximumreport only (mg/L)all year005
Selenium, total [as Se]daily maximumreport only (mg/L)all year005
Phenolics, total recoverabledaily maximumreport only (mg/L)all year005
Phenolics, total recoverabledaily maximumreport only (mg/L)all year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
Mercury, total [as Hg]daily maximumreport only (ng/L)all year005
Mercury, total [as Hg]daily maximumreport only (ng/L)all year005
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall yearB01
BOD, 5-day, 20 deg. Cdaily maximum≤ 60 mg/Lall yearB01
Solids, total suspended30-day average≤ 30 mg/Lall yearB01
Solids, total suspendeddaily maximum≤ 60 mg/Lall yearB01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearB01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearB01

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/IL0002216 · MCP: https://passage-data.com/mcp