Imerys Clays Inc. — NPDES permit GA0047309: limits, due date and EPA's record

NPDES permit GA0047309 · Minor NON-POTW · effective, expires 2028-04-30 · EPA's file as of 2026-09-19

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

Last period with anything received: 2026-07-31. Most often over: Flow, in conduit or thru treatment plant (12), Nitrogen, ammonia total [as N] (1).

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (220)

Outfall	Parameter	Statistic	Limit	Months
001	Turbidity	DAILY AV	report only	all year
001	Turbidity	DAILY AV	report only	all year
001	Turbidity	DAILY MX	report only	all year
001	Turbidity	DAILY MX	report only	all year
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MAXIMUM	<= 8.5 SU	all year
001	pH	MAXIMUM	<= 8.5 SU	all year
001	Solids, total suspended	DAILY AV	<= 25 mg/L	all year
001	Solids, total suspended	DAILY AV	<= 25 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 50 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 50 mg/L	all year
001	Oil & Grease	DAILY AV	<= 10 mg/L	all year
001	Oil & Grease	DAILY AV	<= 10 mg/L	all year
001	Oil & Grease	DAILY MX	<= 15 mg/L	all year
001	Oil & Grease	DAILY MX	<= 15 mg/L	all year
001	Nitrogen, organic total [as N]	DAILY AV	report only	all year
001	Nitrogen, organic total [as N]	DAILY AV	report only	all year
001	Nitrogen, organic total [as N]	DAILY MX	report only	all year
001	Nitrogen, organic total [as N]	DAILY MX	report only	all year
001	Nitrogen, ammonia total [as N]	DAILY AV	<= 1 mg/L	all year
001	Nitrogen, ammonia total [as N]	DAILY AV	<= 1 mg/L	all year
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1.5 mg/L	all year
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 1.5 mg/L	all year
001	Nitrite + Nitrate total [as N]	DAILY AV	report only	all year
001	Nitrite + Nitrate total [as N]	DAILY AV	report only	all year
001	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
001	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
001	Phosphorus, total [as P]	DAILY AV	report only	all year
001	Phosphorus, total [as P]	DAILY AV	report only	all year
001	Phosphorus, total [as P]	DAILY MX	report only	all year
001	Phosphorus, total [as P]	DAILY MX	report only	all year
001	Cadmium, total [as Cd]	DAILY AV	report only	all year
001	Cadmium, total [as Cd]	DAILY AV	report only	all year
001	Cadmium, total [as Cd]	DAILY MX	report only	all year
001	Cadmium, total [as Cd]	DAILY MX	report only	all year
001	Copper, total [as Cu]	DAILY AV	<= .01 mg/L	all year
001	Copper, total [as Cu]	DAILY AV	<= .01 mg/L	all year
001	Copper, total [as Cu]	DAILY MX	<= .015 mg/L	all year
001	Copper, total [as Cu]	DAILY MX	<= .015 mg/L	all year
001	Copper, total [as Cu]	DAILY AV	<= .36 lb/d	all year
001	Copper, total [as Cu]	DAILY AV	<= .36 lb/d	all year
001	Copper, total [as Cu]	DAILY MX	<= .54 lb/d	all year
001	Copper, total [as Cu]	DAILY MX	<= .54 lb/d	all year
001	Zinc, total [as Zn]	DAILY AV	report only	all year
001	Zinc, total [as Zn]	DAILY AV	report only	all year
001	Zinc, total [as Zn]	DAILY MX	report only	all year
001	Zinc, total [as Zn]	DAILY MX	report only	all year
001	Selenium, total [as Se]	DAILY AV	<= .005 mg/L	all year
001	Selenium, total [as Se]	DAILY AV	<= .005 mg/L	all year
001	Selenium, total [as Se]	DAILY AV	report only	all year
001	Selenium, total [as Se]	DAILY AV	report only	all year
001	Selenium, total [as Se]	DAILY MX	<= .008 mg/L	all year
001	Selenium, total [as Se]	DAILY MX	<= .008 mg/L	all year
001	Selenium, total [as Se]	DAILY MX	report only	all year
001	Selenium, total [as Se]	DAILY MX	report only	all year
001	Selenium, total [as Se]	DAILY AV	<= .18 lb/d	all year
001	Selenium, total [as Se]	DAILY AV	<= .18 lb/d	all year
001	Selenium, total [as Se]	DAILY AV	report only	all year
001	Selenium, total [as Se]	DAILY AV	report only	all year
001	Selenium, total [as Se]	DAILY MX	<= .27 lb/d	all year
001	Selenium, total [as Se]	DAILY MX	<= .27 lb/d	all year
001	Selenium, total [as Se]	DAILY MX	report only	all year
001	Selenium, total [as Se]	DAILY MX	report only	all year
001	Nitrogen, total Kjeldahl	DAILY AV	report only	all year
001	Nitrogen, total Kjeldahl	DAILY AV	report only	all year
001	Nitrogen, total Kjeldahl	DAILY MX	report only	all year
001	Nitrogen, total Kjeldahl	DAILY MX	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY AV	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY AV	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
001	Phosphorous, in total orthophosphate	DAILY AV	report only	all year
001	Phosphorous, in total orthophosphate	DAILY AV	report only	all year
001	Phosphorous, in total orthophosphate	DAILY MX	report only	all year
001	Phosphorous, in total orthophosphate	DAILY MX	report only	all year
001	NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia	DAILY AV	<= 100 %	all year
001	NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia	DAILY AV	<= 100 %	all year
001	Noel Statre 7Day Chronic Pimephales	DAILY AV	<= 100 %	all year
001	Noel Statre 7Day Chronic Pimephales	DAILY AV	<= 100 %	all year
002	Turbidity	DAILY AV	report only	all year
002	Turbidity	DAILY AV	report only	all year
002	Turbidity	DAILY MX	report only	all year
002	Turbidity	DAILY MX	report only	all year
002	pH	MINIMUM	>= 6 SU	all year
002	pH	MINIMUM	>= 6 SU	all year
002	pH	MAXIMUM	<= 8.5 SU	all year
002	pH	MAXIMUM	<= 8.5 SU	all year
002	Solids, total suspended	DAILY AV	<= 25 mg/L	all year
002	Solids, total suspended	DAILY AV	<= 25 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 50 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 50 mg/L	all year
002	Oil & Grease	DAILY AV	<= 10 mg/L	all year
002	Oil & Grease	DAILY AV	<= 10 mg/L	all year
002	Oil & Grease	DAILY MX	<= 15 mg/L	all year
002	Oil & Grease	DAILY MX	<= 15 mg/L	all year
002	Nitrogen, organic total [as N]	DAILY AV	report only	all year
002	Nitrogen, organic total [as N]	DAILY AV	report only	all year
002	Nitrogen, organic total [as N]	DAILY MX	report only	all year
002	Nitrogen, organic total [as N]	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY AV	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY AV	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
002	Nitrogen, ammonia total [as N]	DAILY MX	report only	all year
002	Nitrite + Nitrate total [as N]	DAILY AV	report only	all year
002	Nitrite + Nitrate total [as N]	DAILY AV	report only	all year
002	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
002	Nitrite + Nitrate total [as N]	DAILY MX	report only	all year
002	Phosphorus, total [as P]	DAILY AV	<= 1 mg/L	all year
002	Phosphorus, total [as P]	DAILY AV	<= 1 mg/L	all year
002	Phosphorus, total [as P]	DAILY MX	<= 1.5 mg/L	all year
002	Phosphorus, total [as P]	DAILY MX	<= 1.5 mg/L	all year
002	Cadmium, total [as Cd]	DAILY AV	report only	all year
002	Cadmium, total [as Cd]	DAILY AV	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	Copper, total [as Cu]	DAILY AV	<= .013 mg/L	all year
002	Copper, total [as Cu]	DAILY AV	<= .013 mg/L	all year
002	Copper, total [as Cu]	DAILY MX	<= .02 mg/L	all year
002	Copper, total [as Cu]	DAILY MX	<= .02 mg/L	all year
002	Copper, total [as Cu]	DAILY AV	<= .467 lb/d	all year
002	Copper, total [as Cu]	DAILY AV	<= .467 lb/d	all year
002	Copper, total [as Cu]	DAILY MX	<= .701 lb/d	all year
002	Copper, total [as Cu]	DAILY MX	<= .701 lb/d	all year
002	Copper, total [as Cu]	DAILY AV	report only	all year
002	Copper, total [as Cu]	DAILY AV	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	Copper, total [as Cu]	DAILY AV	report only	all year
002	Copper, total [as Cu]	DAILY AV	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	Copper, total [as Cu]	DAILY AV	report only	all year
002	Copper, total [as Cu]	DAILY AV	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	Copper, total [as Cu]	DAILY AV	report only	all year
002	Copper, total [as Cu]	DAILY AV	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	Copper, total [as Cu]	DAILY AV	report only	all year
002	Copper, total [as Cu]	DAILY AV	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	Copper, total [as Cu]	DAILY AV	report only	all year
002	Copper, total [as Cu]	DAILY AV	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	Copper, total [as Cu]	DAILY AV	report only	all year
002	Copper, total [as Cu]	DAILY AV	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	Copper, total [as Cu]	DAILY AV	report only	all year
002	Copper, total [as Cu]	DAILY AV	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	Zinc, total [as Zn]	DAILY AV	report only	all year
002	Zinc, total [as Zn]	DAILY AV	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 AV	<= .007 mg/L	all year
002	Selenium, total [as Se]	DAILY AV	<= .007 mg/L	all year
002	Selenium, total [as Se]	DAILY MX	<= .011 mg/L	all year
002	Selenium, total [as Se]	DAILY MX	<= .011 mg/L	all year
002	Selenium, total [as Se]	DAILY AV	<= .239 lb/d	all year
002	Selenium, total [as Se]	DAILY AV	<= .239 lb/d	all year
002	Selenium, total [as Se]	DAILY MX	<= .359 lb/d	all year
002	Selenium, total [as Se]	DAILY MX	<= .359 lb/d	all year
002	Selenium, total [as Se]	DAILY AV	report only	all year
002	Selenium, total [as Se]	DAILY AV	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	Selenium, total [as Se]	DAILY AV	report only	all year
002	Selenium, total [as Se]	DAILY AV	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	Selenium, total [as Se]	DAILY AV	report only	all year
002	Selenium, total [as Se]	DAILY AV	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	Selenium, total [as Se]	DAILY AV	report only	all year
002	Selenium, total [as Se]	DAILY AV	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	Selenium, total [as Se]	DAILY AV	report only	all year
002	Selenium, total [as Se]	DAILY AV	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	Selenium, total [as Se]	DAILY AV	report only	all year
002	Selenium, total [as Se]	DAILY AV	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	Nitrogen, total Kjeldahl	DAILY AV	report only	all year
002	Nitrogen, total Kjeldahl	DAILY AV	report only	all year
002	Nitrogen, total Kjeldahl	DAILY MX	report only	all year
002	Nitrogen, total Kjeldahl	DAILY MX	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY AV	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY AV	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	<= 4.3 MGD	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	<= 4.3 MGD	all year
002	Flow, in conduit or thru treatment plant	DAILY AV	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY AV	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	<= .795 MGD	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	<= .795 MGD	all year
002	Flow, in conduit or thru treatment plant	DAILY AV	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY AV	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	<= 1.59 MGD	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	<= 1.59 MGD	all year
002	Flow, in conduit or thru treatment plant	DAILY AV	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY AV	report only	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	<= 2.65 MGD	all year
002	Flow, in conduit or thru treatment plant	DAILY MX	<= 2.65 MGD	all year
002	Phosphorous, in total orthophosphate	DAILY AV	report only	all year
002	Phosphorous, in total orthophosphate	DAILY AV	report only	all year
002	Phosphorous, in total orthophosphate	DAILY MX	report only	all year
002	Phosphorous, in total orthophosphate	DAILY MX	report only	all year
002	NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia	DAILY MX	<= 69 %	all year
002	NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia	DAILY MX	<= 69 %	all year
002	Noel Statre 7Day Chronic Pimephales	DAILY MX	<= 69 %	all year
002	Noel Statre 7Day Chronic Pimephales	DAILY MX	<= 69 %	all year