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Dynegy Midwest Generation, LLC

Electric Services, major discharger, Baldwin, Illinois. NPDES permit IL0000043, in force until Oct 31, 2027. Last 12 months: over a limit 2 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (9 values), outfall 002 form 0 monthly (9 values), outfall 003 form 0 monthly (10 values), outfall 004 form 0 monthly (2 values), outfall A01 form 0 monthly (7 values), outfall B01 form 0 monthly (10 values), and 3 more forms
Renewal application due
May 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 78 reports late

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

Period endingOutfallParameterReportedLimitOver by
October 2025A01Coliform, fecal general, daily maximum350 #/100mL≤ 200 #/100mL75%
March 2026001Solids, total suspended, 30-day average15.18 mg/L≤ 15 mg/L1%

Limits in force (185)

ParameterStatisticLimitMonthsOutfall
pHmonthly minimum≥ 6 SUall year001
pHmonthly maximum≤ 9 SUall year001
Solids, total suspended30-day average≤ 15 mg/Lall year001
Solids, total suspendeddaily maximum≤ 30 mg/Lall year001
Oil & Greasedaily maximumreport only (mg/L)all year001
Oil & Greasedaily maximumreport only (mg/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
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all year001
Cyanide, free [amenable to chlorination]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
Boron, total [as B]daily maximum≤ 9.9 mg/Lall 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
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
Oil and grease30-day average≤ 15 mg/Lall year001
Oil and greasedaily maximum≤ 20 mg/Lall year001
Phenolics, total recoverabledaily maximumreport only (mg/L)all year001
Phenolics, total recoverabledaily maximumreport only (mg/L)all 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
Mercury, total [as Hg]daily maximumreport only (ng/L)all year001
Mercury, total [as Hg]daily maximumreport only (ng/L)all year001
Temperature, water deg. fahrenheitmonthly maximumreport only (deg F)all year002
pHmonthly minimum≥ 6 SUall year002
pHmonthly maximum≤ 9 SUall year002
Solids, total suspended30-day average≤ 15 mg/Lall year002
Solids, total suspendeddaily maximum≤ 30 mg/Lall year002
Oil & Greasedaily maximumreport only (mg/L)all year002
Oil & Greasedaily maximumreport only (mg/L)all year002
Oil & Greasedaily maximumreport only (mg/L)all year002
Cyanide, total [as CN]daily maximumreport only (ug/L)all year002
Cyanide, total [as CN]daily maximumreport only (ug/L)all year002
Cyanide, total [as CN]daily maximumreport only (ug/L)all year002
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all year002
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all year002
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all year002
Fluoride, total [as F]daily maximumreport only (mg/L)all year002
Fluoride, total [as F]daily maximumreport only (mg/L)all year002
Fluoride, total [as F]daily maximumreport only (mg/L)all year002
Arsenic, total [as As]daily maximumreport only (mg/L)all year002
Arsenic, total [as As]daily maximumreport only (mg/L)all year002
Arsenic, total [as As]daily maximumreport only (mg/L)all year002
Barium, total [as Ba]daily maximumreport only (mg/L)all year002
Barium, total [as Ba]daily maximumreport only (mg/L)all year002
Barium, total [as Ba]daily maximumreport only (mg/L)all year002
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year002
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year002
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year002
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year002
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year002
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year002
Chromium, total [as Cr]daily maximumreport only (mg/L)all year002
Chromium, total [as Cr]daily maximumreport only (mg/L)all year002
Chromium, total [as Cr]daily maximumreport only (mg/L)all year002
Copper, total [as Cu]daily maximumreport only (mg/L)all year002
Copper, total [as Cu]daily maximumreport only (mg/L)all year002
Copper, total [as Cu]daily maximumreport only (mg/L)all year002
Iron, total [as Fe]daily maximumreport only (mg/L)all year002
Iron, total [as Fe]daily maximumreport only (mg/L)all year002
Iron, total [as Fe]daily maximumreport only (mg/L)all year002
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year002
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year002
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all year002
Lead, total [as Pb]daily maximumreport only (mg/L)all year002
Lead, total [as Pb]daily maximumreport only (mg/L)all year002
Lead, total [as Pb]daily maximumreport only (mg/L)all year002
Manganese, total [as Mn]daily maximumreport only (mg/L)all year002
Manganese, total [as Mn]daily maximumreport only (mg/L)all year002
Manganese, total [as Mn]daily maximumreport only (mg/L)all year002
Nickel, total [as Ni]daily maximumreport only (mg/L)all year002
Nickel, total [as Ni]daily maximumreport only (mg/L)all year002
Nickel, total [as Ni]daily maximumreport only (mg/L)all year002
Silver, total [as Ag]daily maximumreport only (mg/L)all year002
Silver, total [as Ag]daily maximumreport only (mg/L)all year002
Silver, total [as Ag]daily maximumreport only (mg/L)all year002
Zinc, total [as Zn]daily maximumreport only (mg/L)all year002
Zinc, total [as Zn]daily maximumreport only (mg/L)all year002
Zinc, total [as Zn]daily maximumreport only (mg/L)all year002
Selenium, total [as Se]daily maximumreport only (mg/L)all year002
Selenium, total [as Se]daily maximumreport only (mg/L)all year002
Selenium, total [as Se]daily maximumreport only (mg/L)all year002
Oil and grease30-day average≤ 15 mg/Lall year002
Oil and greasedaily maximum≤ 20 mg/Lall year002
Phenolics, total recoverabledaily maximumreport only (mg/L)all year002
Phenolics, total recoverabledaily maximumreport only (mg/L)all year002
Phenolics, total recoverabledaily maximumreport only (mg/L)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
Mercury, total [as Hg]daily maximumreport only (ng/L)all year002
Mercury, total [as Hg]daily maximumreport only (ng/L)all year002
Mercury, total [as Hg]daily maximumreport only (ng/L)all year002
pHmonthly minimum≥ 6.5 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 & Greasedaily maximumreport only (mg/L)all year003
Oil & Greasedaily maximumreport only (mg/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
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all year003
Cyanide, free [amenable to chlorination]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, dissolved [as Cu]30-day average≤ .0144 mg/Lall year003
Copper, dissolved [as Cu]daily maximum≤ .022 mg/Lall 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
Oil and grease30-day average≤ 15 mg/Lall year003
Oil and greasedaily maximum≤ 20 mg/Lall 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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall yearA01
BOD, 5-day, 20 deg. Cdaily maximum≤ 60 mg/Lall yearA01
Solids, total suspended30-day average≤ 37 mg/Lall yearA01
Solids, total suspendeddaily maximum≤ 74 mg/Lall yearA01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearA01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearA01
Coliform, fecal generaldaily maximum≤ 200 #/100mLall yearA01
Solids, total suspended30-day average≤ 15 mg/Lall yearB01
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearB01
Oil & Grease30-day average≤ 15 mg/Lall yearB01
Oil & Greasedaily maximum≤ 20 mg/Lall yearB01
Copper, total [as Cu]30-day average≤ 1 mg/Lall yearB01
Copper, total [as Cu]daily maximum≤ 1 mg/Lall yearB01
Iron, total [as Fe]30-day average≤ 1 mg/Lall yearB01
Iron, total [as Fe]daily maximum≤ 1 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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Your permit document is the final word. As JSON: /api/v1/permits/IL0000043 · MCP: https://passage-data.com/mcp