DYNEGY MIDWEST GENERATION, LLC — NPDES permit IL0000043: limits, due date and EPA's record

NPDES permit IL0000043 · Major NON-POTW · effective, expires 2027-10-31 · EPA's file as of 2026-09-19

EPA's record, 2025-09-01 to 2026-08-31

Last period with anything received: 2026-07-31. Most often over: Coliform, fecal general (2), Solids, total suspended (1).

Reporting

Reports are due about 25 days after each monitoring period ends (the most common figure among IL permits in EPA's filings — check your permit).

Limits in force (185)

Outfall	Parameter	Statistic	Limit	Months
001	pH	MO MIN	>= 6 SU	all year
001	pH	MO MAX	<= 9 SU	all year
001	Solids, total suspended	30DA AVG	<= 15 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
001	Oil & Grease	DAILY MX	report only	all year
001	Oil & Grease	DAILY MX	report only	all year
001	Cyanide, total [as CN]	DAILY MX	report only	all year
001	Cyanide, total [as CN]	DAILY MX	report only	all year
001	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
001	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
001	Fluoride, total [as F]	DAILY MX	report only	all year
001	Fluoride, total [as F]	DAILY MX	report only	all year
001	Arsenic, total [as As]	DAILY MX	report only	all year
001	Arsenic, total [as As]	DAILY MX	report only	all year
001	Barium, total [as Ba]	DAILY MX	report only	all year
001	Barium, total [as Ba]	DAILY MX	report only	all year
001	Boron, total [as B]	DAILY MX	<= 9.9 mg/L	all year
001	Cadmium, total [as Cd]	DAILY MX	report only	all year
001	Cadmium, total [as Cd]	DAILY MX	report only	all year
001	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
001	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
001	Chromium, total [as Cr]	DAILY MX	report only	all year
001	Chromium, total [as Cr]	DAILY MX	report only	all year
001	Copper, total [as Cu]	DAILY MX	report only	all year
001	Copper, total [as Cu]	DAILY MX	report only	all year
001	Iron, total [as Fe]	DAILY MX	report only	all year
001	Iron, total [as Fe]	DAILY MX	report only	all year
001	Iron, dissolved [as Fe]	DAILY MX	report only	all year
001	Iron, dissolved [as Fe]	DAILY MX	report only	all year
001	Lead, total [as Pb]	DAILY MX	report only	all year
001	Lead, total [as Pb]	DAILY MX	report only	all year
001	Nickel, total [as Ni]	DAILY MX	report only	all year
001	Nickel, total [as Ni]	DAILY MX	report only	all year
001	Silver, total [as Ag]	DAILY MX	report only	all year
001	Silver, total [as Ag]	DAILY MX	report only	all year
001	Zinc, total [as Zn]	DAILY MX	report only	all year
001	Zinc, total [as Zn]	DAILY MX	report only	all year
001	Selenium, total [as Se]	DAILY MX	report only	all year
001	Selenium, total [as Se]	DAILY MX	report only	all year
001	Oil and grease	30DA AVG	<= 15 mg/L	all year
001	Oil and grease	DAILY MX	<= 20 mg/L	all year
001	Phenolics, total recoverable	DAILY MX	report only	all year
001	Phenolics, total recoverable	DAILY MX	report only	all year
001	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
001	Mercury, total [as Hg]	DAILY MX	report only	all year
001	Mercury, total [as Hg]	DAILY MX	report only	all year
002	Temperature, water deg. fahrenheit	MO MAX	report only	all year
002	pH	MO MIN	>= 6 SU	all year
002	pH	MO MAX	<= 9 SU	all year
002	Solids, total suspended	30DA AVG	<= 15 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
002	Oil & Grease	DAILY MX	report only	all year
002	Oil & Grease	DAILY MX	report only	all year
002	Oil & Grease	DAILY MX	report only	all year
002	Cyanide, total [as CN]	DAILY MX	report only	all year
002	Cyanide, total [as CN]	DAILY MX	report only	all year
002	Cyanide, total [as CN]	DAILY MX	report only	all year
002	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
002	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
002	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
002	Fluoride, total [as F]	DAILY MX	report only	all year
002	Fluoride, total [as F]	DAILY MX	report only	all year
002	Fluoride, total [as F]	DAILY MX	report only	all year
002	Arsenic, total [as As]	DAILY MX	report only	all year
002	Arsenic, total [as As]	DAILY MX	report only	all year
002	Arsenic, total [as As]	DAILY MX	report only	all year
002	Barium, total [as Ba]	DAILY MX	report only	all year
002	Barium, total [as Ba]	DAILY MX	report only	all year
002	Barium, total [as Ba]	DAILY MX	report only	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	all year
002	Cadmium, total [as Cd]	DAILY MX	report only	all year
002	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
002	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
002	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
002	Chromium, total [as Cr]	DAILY MX	report only	all year
002	Chromium, total [as Cr]	DAILY MX	report only	all year
002	Chromium, total [as Cr]	DAILY MX	report only	all year
002	Copper, total [as Cu]	DAILY MX	report only	all year
002	Copper, total [as Cu]	DAILY MX	report only	all year
002	Copper, total [as Cu]	DAILY MX	report only	all year
002	Iron, total [as Fe]	DAILY MX	report only	all year
002	Iron, total [as Fe]	DAILY MX	report only	all year
002	Iron, total [as Fe]	DAILY MX	report only	all year
002	Iron, dissolved [as Fe]	DAILY MX	report only	all year
002	Iron, dissolved [as Fe]	DAILY MX	report only	all year
002	Iron, dissolved [as Fe]	DAILY MX	report only	all year
002	Lead, total [as Pb]	DAILY MX	report only	all year
002	Lead, total [as Pb]	DAILY MX	report only	all year
002	Lead, total [as Pb]	DAILY MX	report only	all year
002	Manganese, total [as Mn]	DAILY MX	report only	all year
002	Manganese, total [as Mn]	DAILY MX	report only	all year
002	Manganese, total [as Mn]	DAILY MX	report only	all year
002	Nickel, total [as Ni]	DAILY MX	report only	all year
002	Nickel, total [as Ni]	DAILY MX	report only	all year
002	Nickel, total [as Ni]	DAILY MX	report only	all year
002	Silver, total [as Ag]	DAILY MX	report only	all year
002	Silver, total [as Ag]	DAILY MX	report only	all year
002	Silver, total [as Ag]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Selenium, total [as Se]	DAILY MX	report only	all year
002	Selenium, total [as Se]	DAILY MX	report only	all year
002	Selenium, total [as Se]	DAILY MX	report only	all year
002	Oil and grease	30DA AVG	<= 15 mg/L	all year
002	Oil and grease	DAILY MX	<= 20 mg/L	all year
002	Phenolics, total recoverable	DAILY MX	report only	all year
002	Phenolics, total recoverable	DAILY MX	report only	all year
002	Phenolics, total recoverable	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
002	Mercury, total [as Hg]	DAILY MX	report only	all year
002	Mercury, total [as Hg]	DAILY MX	report only	all year
002	Mercury, total [as Hg]	DAILY MX	report only	all year
003	pH	MO MIN	>= 6.5 SU	all year
003	pH	MO MAX	<= 9 SU	all year
003	Solids, total suspended	30DA AVG	<= 15 mg/L	all year
003	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
003	Oil & Grease	DAILY MX	report only	all year
003	Oil & Grease	DAILY MX	report only	all year
003	Cyanide, total [as CN]	DAILY MX	report only	all year
003	Cyanide, total [as CN]	DAILY MX	report only	all year
003	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
003	Cyanide, free [amenable to chlorination]	DAILY MX	report only	all year
003	Fluoride, total [as F]	DAILY MX	report only	all year
003	Fluoride, total [as F]	DAILY MX	report only	all year
003	Arsenic, total [as As]	DAILY MX	report only	all year
003	Arsenic, total [as As]	DAILY MX	report only	all year
003	Barium, total [as Ba]	DAILY MX	report only	all year
003	Barium, total [as Ba]	DAILY MX	report only	all year
003	Cadmium, total [as Cd]	DAILY MX	report only	all year
003	Cadmium, total [as Cd]	DAILY MX	report only	all year
003	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
003	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
003	Chromium, total [as Cr]	DAILY MX	report only	all year
003	Chromium, total [as Cr]	DAILY MX	report only	all year
003	Copper, dissolved [as Cu]	30DA AVG	<= .0144 mg/L	all year
003	Copper, dissolved [as Cu]	DAILY MX	<= .022 mg/L	all year
003	Copper, total [as Cu]	DAILY MX	report only	all year
003	Copper, total [as Cu]	DAILY MX	report only	all year
003	Iron, total [as Fe]	DAILY MX	report only	all year
003	Iron, total [as Fe]	DAILY MX	report only	all year
003	Iron, dissolved [as Fe]	DAILY MX	report only	all year
003	Iron, dissolved [as Fe]	DAILY MX	report only	all year
003	Lead, total [as Pb]	DAILY MX	report only	all year
003	Lead, total [as Pb]	DAILY MX	report only	all year
003	Manganese, total [as Mn]	DAILY MX	report only	all year
003	Manganese, total [as Mn]	DAILY MX	report only	all year
003	Nickel, total [as Ni]	DAILY MX	report only	all year
003	Nickel, total [as Ni]	DAILY MX	report only	all year
003	Silver, total [as Ag]	DAILY MX	report only	all year
003	Silver, total [as Ag]	DAILY MX	report only	all year
003	Zinc, total [as Zn]	DAILY MX	report only	all year
003	Zinc, total [as Zn]	DAILY MX	report only	all year
003	Selenium, total [as Se]	DAILY MX	report only	all year
003	Selenium, total [as Se]	DAILY MX	report only	all year
003	Oil and grease	30DA AVG	<= 15 mg/L	all year
003	Oil and grease	DAILY MX	<= 20 mg/L	all year
003	Phenolics, total recoverable	DAILY MX	report only	all year
003	Phenolics, total recoverable	DAILY MX	report only	all year
003	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
003	Mercury, total [as Hg]	DAILY MX	report only	all year
003	Mercury, total [as Hg]	DAILY MX	report only	all year
004	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
004	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
A01	BOD, 5-day, 20 deg. C	30DA AVG	<= 30 mg/L	all year
A01	BOD, 5-day, 20 deg. C	DAILY MX	<= 60 mg/L	all year
A01	Solids, total suspended	30DA AVG	<= 37 mg/L	all year
A01	Solids, total suspended	DAILY MX	<= 74 mg/L	all year
A01	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
A01	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
A01	Coliform, fecal general	DAILY MX	<= 200 #/100mL	all year
B01	Solids, total suspended	30DA AVG	<= 15 mg/L	all year
B01	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
B01	Oil & Grease	30DA AVG	<= 15 mg/L	all year
B01	Oil & Grease	DAILY MX	<= 20 mg/L	all year
B01	Copper, total [as Cu]	30DA AVG	<= 1 mg/L	all year
B01	Copper, total [as Cu]	DAILY MX	<= 1 mg/L	all year
B01	Iron, total [as Fe]	30DA AVG	<= 1 mg/L	all year
B01	Iron, total [as Fe]	DAILY MX	<= 1 mg/L	all year
B01	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
B01	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year