US SILICA COMPANY — NPDES permit IL0001325: limits, due date and EPA's record

NPDES permit IL0001325 · Minor NON-POTW · effective, expires 2028-09-30 · 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 (read off this permit's own late-day counts in EPA's filings).

Limits in force (94)

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	30DA AVG	<= 25 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 45 mg/L	all year
002	Oil & Grease	DAILY MX	report only	all year
002	Oil & Grease	DAILY MX	report only	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	Hardness, total [as CaCO3]	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	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]	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	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	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	Offensive Conditions	MAXIMUM	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
004	pH	MO MIN	>= 6.5 SU	all year
004	pH	MO MAX	<= 9 SU	all year
004	Solids, total suspended	30DA AVG	<= 25 mg/L	all year
004	Solids, total suspended	DAILY MX	<= 45 mg/L	all year
004	Oil & Grease	DAILY MX	report only	all year
004	Oil & Grease	DAILY MX	report only	all year
004	Cyanide, weak acid, dissociable	DAILY MX	report only	all year
004	Cyanide, weak acid, dissociable	DAILY MX	report only	all year
004	Cyanide, total [as CN]	DAILY MX	report only	all year
004	Cyanide, total [as CN]	DAILY MX	report only	all year
004	Hardness, total [as CaCO3]	DAILY MX	report only	all year
004	Fluoride, total [as F]	DAILY MX	report only	all year
004	Fluoride, total [as F]	DAILY MX	report only	all year
004	Arsenic, total [as As]	DAILY MX	report only	all year
004	Arsenic, total [as As]	DAILY MX	report only	all year
004	Barium, total [as Ba]	DAILY MX	report only	all year
004	Barium, total [as Ba]	DAILY MX	report only	all year
004	Cadmium, total [as Cd]	DAILY MX	report only	all year
004	Cadmium, total [as Cd]	DAILY MX	report only	all year
004	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
004	Chromium, hexavalent [as Cr]	DAILY MX	report only	all year
004	Chromium, total [as Cr]	DAILY MX	report only	all year
004	Chromium, total [as Cr]	DAILY MX	report only	all year
004	Copper, total [as Cu]	DAILY MX	report only	all year
004	Copper, total [as Cu]	DAILY MX	report only	all year
004	Iron, total [as Fe]	DAILY MX	report only	all year
004	Iron, total [as Fe]	DAILY MX	report only	all year
004	Iron, dissolved [as Fe]	DAILY MX	report only	all year
004	Iron, dissolved [as Fe]	DAILY MX	report only	all year
004	Lead, total [as Pb]	DAILY MX	report only	all year
004	Lead, total [as Pb]	DAILY MX	report only	all year
004	Manganese, total [as Mn]	DAILY MX	report only	all year
004	Manganese, total [as Mn]	DAILY MX	report only	all year
004	Nickel, total [as Ni]	DAILY MX	report only	all year
004	Nickel, total [as Ni]	DAILY MX	report only	all year
004	Silver, total [as Ag]	DAILY MX	report only	all year
004	Silver, total [as Ag]	DAILY MX	report only	all year
004	Zinc, total [as Zn]	DAILY MX	report only	all year
004	Zinc, total [as Zn]	DAILY MX	report only	all year
004	Selenium, total [as Se]	DAILY MX	report only	all year
004	Selenium, total [as Se]	DAILY MX	report only	all year
004	Phenolics, total recoverable	DAILY MX	report only	all year
004	Phenolics, total recoverable	DAILY MX	report only	all year
004	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
004	Offensive Conditions	MAXIMUM	report only	all year
004	Mercury, total [as Hg]	DAILY MX	report only	all year
004	Mercury, total [as Hg]	DAILY MX	report only	all year