ILLINOIS POWER RESOURCES GENERATING LLC — NPDES permit IL0055620: limits, due date and EPA's record

NPDES permit IL0055620 · Minor NON-POTW · effective, expires 2027-02-28 · EPA's file as of 2026-09-19

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

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 (86)

Outfall	Parameter	Statistic	Limit	Months
001	pH	MO MIN	report only	all year
001	pH	MO MAX	report only	all year
001	Solids, total suspended	DAILY MX	report only	all year
001	Boron, total [as B]	30DA AVG	<= 7.6 mg/L	all year
001	Boron, total [as B]	DAILY MX	report only	all year
001	Iron, total [as Fe]	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
002	pH	MO MIN	>= 6 SU	all year
002	pH	MO MIN	>= 6 SU	all year
002	pH	MO MAX	<= 9 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	30DA AVG	<= 15 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 3 mg/L	all year
002	Nitrogen, ammonia total [as N]	30DA AVG	<= 3 mg/L	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 6 mg/L	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	<= 6 mg/L	all year
002	Cyanide, weak acid, dissociable	DAILY MX	report only	all year
002	Cyanide, weak acid, dissociable	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	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	Barium, total [as Ba]	DAILY MX	report only	all year
002	Barium, total [as Ba]	DAILY MX	report only	all year
002	Boron, total [as B]	DAILY MX	<= 4.5 mg/L	all year
002	Boron, total [as B]	DAILY MX	<= 4.5 mg/L	all year
002	Boron, total [as B]	30DA AVG	<= 7.6 mg/L	all year
002	Boron, total [as B]	30DA AVG	<= 7.6 mg/L	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, 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	Iron, total [as Fe]	30DA AVG	<= 2 mg/L	all year
002	Iron, total [as Fe]	30DA AVG	<= 2 mg/L	all year
002	Iron, total [as Fe]	DAILY MX	<= 4 mg/L	all year
002	Iron, total [as Fe]	DAILY MX	<= 4 mg/L	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	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	Thallium, total [as Tl]	DAILY MX	report only	all year
002	Thallium, total [as Tl]	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	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Antimony, total [as Sb]	DAILY MX	report only	all year
002	Antimony, total [as Sb]	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	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	MO AVG	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	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	Mar, Sep
002	Mercury, total [as Hg]	DAILY MX	report only	Mar, Sep
004	pH	MO MIN	>= 6 SU	all year
004	pH	MO MAX	<= 9 SU	all year
004	Solids, total suspended	30DA AVG	<= 15 mg/L	all year
004	Solids, total suspended	DAILY MX	<= 30 mg/L	all year
004	Nitrogen, ammonia total [as N]	30DA AVG	<= 3 mg/L	all year
004	Nitrogen, ammonia total [as N]	DAILY MX	<= 6 mg/L	all year
004	Boron, total [as B]	DAILY MX	report only	all year
004	Iron, total [as Fe]	30DA AVG	<= 2 mg/L	all year
004	Iron, total [as Fe]	DAILY MX	<= 4 mg/L	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
004	Mercury, total [as Hg]	ANNL AVG	<= .000012 mg/L	all year