KOPPERS INC — NPDES permit IL0035688: limits, due date and EPA's record

NPDES permit IL0035688 · Minor NON-POTW · effective, expires 2030-02-28 · 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 (28)

Outfall	Parameter	Statistic	Limit	Months
002	pH	MO MIN	>= 6.5 SU	all year
002	pH	MO MAX	<= 9 SU	all year
002	Solids, total suspended	DAILY MX	report only	all year
002	Oil & Grease	30DA AVG	<= 15 mg/L	all year
002	Oil & Grease	DAILY MX	report only	all year
002	Oil & Grease	DAILY MX	<= 30 mg/L	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	Barium, total [as Ba]	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, total [as Cr]	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, dissolved [as Fe]	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	Nickel, total [as Ni]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MX	report only	all year
002	Zinc, total [as Zn]	DAILY MX	<= .3187 mg/L	all year
002	Phenolics, total recoverable	DAILY MX	report only	all year
002	Phenolics, total recoverable	DAILY MX	<= .1 mg/L	all year
002	Naphthalene	DAILY MX	report only	all year
002	Pentachlorophenol	DAILY MX	report only	all year
002	Priority Pollutants	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	Chemical Oxygen Demand [COD]	DAILY MX	report only	all year