IMERYS WOLLANSTONITE USA LLC — NPDES permit NY0006092: limits, due date and EPA's record

NPDES permit NY0006092 · Minor NON-POTW · effective, expires 2027-11-30 · EPA's file as of 2026-09-19

Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

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

Last period with anything received: 2026-06-30. Most often over: Oxygen, dissolved [DO] (3).

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among NY permits in EPA's filings — check your permit).

Limits in force (20)

Outfall	Parameter	Statistic	Limit	Months
002	Temperature, water deg. fahrenheit	MAXIMUM	<= 70 deg F	all year
002	Flow rate	MO AVG	report only	all year
002	BOD, 5-day, 20 deg. C	MO AVG	<= 20 mg/L	all year
002	pH	MINIMUM	>= 6.5 SU	all year
002	pH	MAXIMUM	<= 8.5 SU	all year
002	Solids, total suspended	MO AVG	<= 10 mg/L	all year
002	Oil & Grease	MO AVG	<= 15 mg/L	all year
003	Temperature, water deg. fahrenheit	MAXIMUM	<= 70 deg F	all year
003	Flow rate	MO AVG	<= 3000 gal/d	all year
003	Oxygen, dissolved [DO]	MINIMUM	>= 5 mg/L	all year
003	Oxygen, dissolved [DO]	MO AVG	<= 7 mg/L	all year
003	Oxygen, dissolved [DO]	MO AVG	<= 7 mg/L	all year
003	BOD, 5-day, 20 deg. C	MO AVG	<= 5 mg/L	all year
003	pH	MINIMUM	>= 6.5 SU	all year
003	pH	MAXIMUM	<= 8.5 SU	all year
003	Solids, total suspended	MO AVG	<= 10 mg/L	all year
003	Solids, total suspended	MO AVG	<= .25 lb/d	all year
003	Solids, settleable	MO AVG	<= .1 mL/L	all year
003	Nitrogen, ammonia total [as N]	MO AVG	<= 1.6 mg/L	all year
003	Phosphorus, total [as P]	MO AVG	report only	all year