AEP GENERATING COMPANY — NPDES permit IL0042773: limits, due date and EPA's record

NPDES permit IL0042773 · Minor NON-POTW · effective, expires 2029-05-31 · 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 (102)

Outfall	Parameter	Statistic	Limit	Months
002	pH	MINIMUM	>= 6 SU	all year
002	pH	MINIMUM	>= 6 SU	all year
002	pH	MINIMUM	>= 6.5 SU	all year
002	pH	MINIMUM	>= 6.5 SU	all year
002	pH	QC	>= 6 SU	all year
002	pH	QC	>= 6 SU	all year
002	pH	QC	>= 6 SU	all year
002	pH	QC	>= 6 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	pH	QB	<= 9 SU	all year
002	pH	QB	<= 9 SU	all year
002	pH	QB	<= 9 SU	all year
002	pH	QB	<= 9 SU	all year
002	Alkalinity, total [as CaCO3]	DAILY MX	report only	all year
002	Alkalinity, total [as CaCO3]	DAILY MX	report only	all year
002	Alkalinity, total [as CaCO3]	DAILY MX	report only	all year
002	Alkalinity, total [as CaCO3]	DAILY MX	report only	all year
002	Acidity, total [as CaCO3]	DAILY MX	report only	all year
002	Acidity, total [as CaCO3]	DAILY MX	report only	all year
002	Acidity, total [as CaCO3]	DAILY MX	report only	all year
002	Acidity, total [as CaCO3]	DAILY MX	report only	all year
002	Solids, total suspended	30DA AVG	<= 35 mg/L	all year
002	Solids, total suspended	30DA AVG	<= 35 mg/L	all year
002	Solids, total suspended	30DA AVG	<= 35 mg/L	all year
002	Solids, total suspended	30DA AVG	<= 35 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 70 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 70 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 70 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 70 mg/L	all year
002	Solids, settleable	QB	<= .5 mL/L	all year
002	Solids, settleable	QB	<= .5 mL/L	all year
002	Hardness, total [as CaCO3]	DAILY MX	report only	all year
002	Hardness, total [as CaCO3]	DAILY MX	report only	all year
002	Hardness, total [as CaCO3]	DAILY MX	report only	all year
002	Hardness, total [as CaCO3]	DAILY MX	report only	all year
002	Hardness, total [as CaCO3]	QB	report only	all year
002	Hardness, total [as CaCO3]	QB	report only	all year
002	Hardness, total [as CaCO3]	QB	report only	all year
002	Hardness, total [as CaCO3]	QB	report only	all year
002	Chloride [as Cl]	DAILY MX	<= 500 mg/L	all year
002	Chloride [as Cl]	DAILY MX	<= 500 mg/L	all year
002	Chloride [as Cl]	DAILY MX	<= 500 mg/L	all year
002	Chloride [as Cl]	DAILY MX	<= 500 mg/L	all year
002	Chloride [as Cl]	QB	<= 500 mg/L	all year
002	Chloride [as Cl]	QB	<= 500 mg/L	all year
002	Chloride [as Cl]	QB	<= 500 mg/L	all year
002	Chloride [as Cl]	QB	<= 500 mg/L	all year
002	Sulfate, total [as SO4]	DAILY MX	<= 1300 mg/L	all year
002	Sulfate, total [as SO4]	DAILY MX	<= 1300 mg/L	all year
002	Sulfate, total [as SO4]	DAILY MX	<= 1300 mg/L	all year
002	Sulfate, total [as SO4]	DAILY MX	<= 1300 mg/L	all year
002	Sulfate, total [as SO4]	QB	<= 1300 mg/L	all year
002	Sulfate, total [as SO4]	QB	<= 1300 mg/L	all year
002	Sulfate, total [as SO4]	QB	<= 1300 mg/L	all year
002	Sulfate, total [as SO4]	QB	<= 1300 mg/L	all year
002	Iron, total [as Fe]	30DA AVG	<= 3.5 mg/L	all year
002	Iron, total [as Fe]	30DA AVG	<= 3.5 mg/L	all year
002	Iron, total [as Fe]	30DA AVG	<= 3.5 mg/L	all year
002	Iron, total [as Fe]	30DA AVG	<= 3.5 mg/L	all year
002	Iron, total [as Fe]	DAILY MX	<= 7 mg/L	all year
002	Iron, total [as Fe]	DAILY MX	<= 7 mg/L	all year
002	Iron, total [as Fe]	DAILY MX	<= 7 mg/L	all year
002	Iron, total [as Fe]	DAILY MX	<= 7 mg/L	all year
002	Manganese, total [as Mn]	30DA AVG	<= 2 mg/L	all year
002	Manganese, total [as Mn]	30DA AVG	<= 2 mg/L	all year
002	Manganese, total [as Mn]	30DA AVG	<= 2 mg/L	all year
002	Manganese, total [as Mn]	30DA AVG	<= 2 mg/L	all year
002	Manganese, total [as Mn]	DAILY MX	<= 4 mg/L	all year
002	Manganese, total [as Mn]	DAILY MX	<= 4 mg/L	all year
002	Manganese, total [as Mn]	DAILY MX	<= 4 mg/L	all year
002	Manganese, total [as Mn]	DAILY MX	<= 4 mg/L	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	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	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	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	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	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	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
004	pH	MINIMUM	>= 6 SU	all year
004	pH	MINIMUM	>= 6 SU	all year
004	pH	MAXIMUM	<= 9 SU	all year
004	pH	MAXIMUM	<= 9 SU	all year
004	Solids, settleable	ANNL MAX	<= .5 mL/L	all year
004	Solids, settleable	ANNL MAX	<= .5 mL/L	all year
005	pH	MINIMUM	>= 6 SU	all year
005	pH	MINIMUM	>= 6 SU	all year
005	pH	MAXIMUM	<= 9 SU	all year
005	pH	MAXIMUM	<= 9 SU	all year
005	Solids, settleable	ANNL MAX	<= .5 mL/L	all year
005	Solids, settleable	ANNL MAX	<= .5 mL/L	all year