TransAlta Centralia Mining LLC — NPDES permit WA0037338: limits, due date and EPA's record

NPDES permit WA0037338 · Major NON-POTW · administratively continued, expires 2022-10-31 · EPA's file as of 2026-09-19

This permit expired on 2022-10-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

Last period with anything received: 2026-08-31. Most often over: Solids, total suspended (1).

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among WA permits in EPA's filings — check your permit).

Limits in force (256)

Outfall	Parameter	Statistic	Limit	Months
001	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
001	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
001	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
001	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
001	Turbidity	MO AVG	<= 25 NTU	all year
001	Turbidity	MO AVG	<= 25 NTU	all year
001	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
001	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	pH	MAXIMUM	<= 9 SU	all year
001	pH	MINIMUM	>= 6 SU	all year
001	pH	MINIMUM	>= 6 SU	all year
001	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
001	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
001	Solids, total suspended	MO AVG	<= 20 mg/L	all year
001	Solids, total suspended	MO AVG	<= 20 mg/L	all year
001	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
001	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
001	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
001	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
002	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
002	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
002	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
002	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
002	Turbidity	MO AVG	<= 25 NTU	all year
002	Turbidity	MO AVG	<= 25 NTU	all year
002	Conductivity	DAILY MX	report only (alert)	all year
002	Conductivity	DAILY MX	report only (alert)	all year
002	Sulfate [as S]	DAILY MX	report only (alert)	all year
002	Sulfate [as S]	DAILY MX	report only (alert)	all year
002	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
002	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	pH	MAXIMUM	<= 9 SU	all year
002	pH	MINIMUM	>= 6 SU	all year
002	pH	MINIMUM	>= 6 SU	all year
002	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
002	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
002	Solids, total suspended	MO AVG	<= 20 mg/L	all year
002	Solids, total suspended	MO AVG	<= 20 mg/L	all year
002	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
002	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
002	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
002	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
002	Aluminum, total [as Al]	MO AVG	report only (alert)	all year
002	Aluminum, total [as Al]	MO AVG	report only (alert)	all year
002	Solids, total dissolved	DAILY MX	report only (alert)	all year
002	Solids, total dissolved	DAILY MX	report only (alert)	all year
002	Hydrocarbons, total petroleum	DAILY MX	<= 15 mg/L	all year
002	Hydrocarbons, total petroleum	DAILY MX	<= 15 mg/L	all year
002	Hydrocarbons, total petroleum	MO AVG	<= 10 mg/L	all year
002	Hydrocarbons, total petroleum	MO AVG	<= 10 mg/L	all year
003	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
003	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
003	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
003	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
003	Turbidity	MO AVG	<= 25 NTU	all year
003	Turbidity	MO AVG	<= 25 NTU	all year
003	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
003	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
003	pH	MAXIMUM	<= 9 SU	all year
003	pH	MAXIMUM	<= 9 SU	all year
003	pH	MINIMUM	>= 6 SU	all year
003	pH	MINIMUM	>= 6 SU	all year
003	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
003	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
003	Solids, total suspended	MO AVG	<= 20 mg/L	all year
003	Solids, total suspended	MO AVG	<= 20 mg/L	all year
003	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
003	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
003	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
003	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
004	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
004	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
004	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
004	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
004	Turbidity	MO AVG	<= 25 NTU	all year
004	Turbidity	MO AVG	<= 25 NTU	all year
004	Conductivity	DAILY MX	report only (alert)	all year
004	Conductivity	DAILY MX	report only (alert)	all year
004	Sulfate [as S]	DAILY MX	report only (alert)	all year
004	Sulfate [as S]	DAILY MX	report only (alert)	all year
004	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
004	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
004	pH	MAXIMUM	<= 9 SU	all year
004	pH	MAXIMUM	<= 9 SU	all year
004	pH	MINIMUM	>= 6 SU	all year
004	pH	MINIMUM	>= 6 SU	all year
004	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
004	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
004	Solids, total suspended	MO AVG	<= 20 mg/L	all year
004	Solids, total suspended	MO AVG	<= 20 mg/L	all year
004	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
004	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
004	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
004	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
004	Aluminum, total [as Al]	MO AVG	report only (alert)	all year
004	Aluminum, total [as Al]	MO AVG	report only (alert)	all year
004	Solids, total dissolved	DAILY MX	report only (alert)	all year
004	Solids, total dissolved	DAILY MX	report only (alert)	all year
004	Hydrocarbons, total petroleum	DAILY MX	<= 15 mg/L	all year
004	Hydrocarbons, total petroleum	DAILY MX	<= 15 mg/L	all year
004	Hydrocarbons, total petroleum	MO AVG	<= 10 mg/L	all year
004	Hydrocarbons, total petroleum	MO AVG	<= 10 mg/L	all year
005	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
005	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
005	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
005	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
005	Turbidity	MO AVG	<= 25 NTU	all year
005	Turbidity	MO AVG	<= 25 NTU	all year
005	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
005	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
005	pH	MAXIMUM	<= 9 SU	all year
005	pH	MAXIMUM	<= 9 SU	all year
005	pH	MINIMUM	>= 6 SU	all year
005	pH	MINIMUM	>= 6 SU	all year
005	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
005	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
005	Solids, total suspended	MO AVG	<= 20 mg/L	all year
005	Solids, total suspended	MO AVG	<= 20 mg/L	all year
005	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
005	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
005	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
005	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
006	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
006	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
006	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
006	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
006	Turbidity	MO AVG	<= 25 NTU	all year
006	Turbidity	MO AVG	<= 25 NTU	all year
006	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
006	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
006	pH	MAXIMUM	<= 9 SU	all year
006	pH	MAXIMUM	<= 9 SU	all year
006	pH	MINIMUM	>= 6 SU	all year
006	pH	MINIMUM	>= 6 SU	all year
006	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
006	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
006	Solids, total suspended	MO AVG	<= 20 mg/L	all year
006	Solids, total suspended	MO AVG	<= 20 mg/L	all year
006	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
006	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
006	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
006	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
008	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
008	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
008	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
008	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
008	Turbidity	MO AVG	<= 25 NTU	all year
008	Turbidity	MO AVG	<= 25 NTU	all year
008	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
008	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
008	pH	MAXIMUM	<= 9 SU	all year
008	pH	MAXIMUM	<= 9 SU	all year
008	pH	MINIMUM	>= 6 SU	all year
008	pH	MINIMUM	>= 6 SU	all year
008	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
008	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
008	Solids, total suspended	MO AVG	<= 20 mg/L	all year
008	Solids, total suspended	MO AVG	<= 20 mg/L	all year
008	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
008	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
008	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
008	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
009	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
009	Temperature, water deg. centigrade	DAILY MX	<= 17.5 deg C	all year
009	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
009	Temperature, water deg. centigrade	MO AVG	<= 17.5 deg C	all year
009	Turbidity	MO AVG	<= 50 NTU	all year
009	Turbidity	MO AVG	<= 50 NTU	all year
009	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
009	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
009	pH	MAXIMUM	<= 9 SU	all year
009	pH	MAXIMUM	<= 9 SU	all year
009	pH	MINIMUM	>= 6 SU	all year
009	pH	MINIMUM	>= 6 SU	all year
009	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
009	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
009	Solids, total suspended	MO AVG	<= 20 mg/L	all year
009	Solids, total suspended	MO AVG	<= 20 mg/L	all year
009	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
009	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
009	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
009	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
010	Temperature, water deg. centigrade	DAILY MX	report only (alert)	all year
010	Temperature, water deg. centigrade	DAILY MX	report only (alert)	all year
010	Temperature, water deg. centigrade	MO AVG	report only (alert)	all year
010	Temperature, water deg. centigrade	MO AVG	report only (alert)	all year
010	Turbidity	MO AVG	<= 50 NTU	all year
010	Turbidity	MO AVG	<= 50 NTU	all year
010	Conductivity	DAILY MX	report only (alert)	all year
010	Conductivity	DAILY MX	report only (alert)	all year
010	Sulfate [as S]	DAILY MX	report only (alert)	all year
010	Sulfate [as S]	DAILY MX	report only (alert)	all year
010	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
010	Oxygen, dissolved [DO]	MINIMUM	>= 8 mg/L	all year
010	pH	MAXIMUM	<= 9 SU	all year
010	pH	MAXIMUM	<= 9 SU	all year
010	pH	MINIMUM	>= 6 SU	all year
010	pH	MINIMUM	>= 6 SU	all year
010	Solids, total suspended	DAILY MX	report only (alert)	all year
010	Solids, total suspended	DAILY MX	report only (alert)	all year
010	Solids, total suspended	MO AVG	report only (alert)	all year
010	Solids, total suspended	MO AVG	report only (alert)	all year
010	Solids, settleable	DAILY MX	<= .5 mL/L	all year
010	Solids, settleable	MO AVG	report only	all year
010	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
010	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
010	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
010	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
010	Manganese, total [as Mn]	DAILY MX	<= 4 mg/L	all year
010	Manganese, total [as Mn]	DAILY MX	<= 4 mg/L	all year
010	Manganese, total [as Mn]	MO AVG	<= 2 mg/L	all year
010	Manganese, total [as Mn]	MO AVG	<= 2 mg/L	all year
010	Solids, total dissolved	DAILY MX	report only (alert)	all year
010	Solids, total dissolved	DAILY MX	report only (alert)	all year
011	Temperature, water deg. centigrade	DAILY MX	<= 16 deg C	all year
011	Temperature, water deg. centigrade	DAILY MX	<= 16 deg C	all year
011	Temperature, water deg. centigrade	MO AVG	<= 16 deg C	all year
011	Temperature, water deg. centigrade	MO AVG	<= 16 deg C	all year
011	Turbidity	MO AVG	<= 25 NTU	all year
011	Turbidity	MO AVG	<= 25 NTU	all year
011	Oxygen, dissolved [DO]	MINIMUM	>= 9.5 mg/L	all year
011	Oxygen, dissolved [DO]	MINIMUM	>= 9.5 mg/L	all year
011	pH	MAXIMUM	<= 9 SU	all year
011	pH	MAXIMUM	<= 9 SU	all year
011	pH	MINIMUM	>= 6 SU	all year
011	pH	MINIMUM	>= 6 SU	all year
011	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
011	Solids, total suspended	DAILY MX	<= 40 mg/L	all year
011	Solids, total suspended	MO AVG	<= 20 mg/L	all year
011	Solids, total suspended	MO AVG	<= 20 mg/L	all year
011	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
011	Iron, total [as Fe]	DAILY MX	<= 3.5 mg/L	all year
011	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
011	Iron, total [as Fe]	MO AVG	<= 3.5 mg/L	all year
012	pH	MAXIMUM	report only (alert)	all year
012	pH	MAXIMUM	report only (alert)	all year
012	pH	MINIMUM	report only (alert)	all year
012	pH	MINIMUM	report only (alert)	all year
012	Solids, total suspended	DAILY MX	report only (alert)	all year
012	Solids, total suspended	DAILY MX	report only (alert)	all year
012	Solids, total suspended	MO AVG	report only (alert)	all year
012	Solids, total suspended	MO AVG	report only (alert)	all year
012	Iron, total [as Fe]	DAILY MX	report only (alert)	all year
012	Iron, total [as Fe]	DAILY MX	report only (alert)	all year
012	Iron, total [as Fe]	MO AVG	report only (alert)	all year
012	Iron, total [as Fe]	MO AVG	report only (alert)	all year
012	Manganese, total [as Mn]	DAILY MX	report only (alert)	all year
012	Manganese, total [as Mn]	DAILY MX	report only (alert)	all year
012	Manganese, total [as Mn]	MO AVG	report only (alert)	all year
012	Manganese, total [as Mn]	MO AVG	report only (alert)	all year
UHNC	Flow	DAILY MX	report only (alert)	all year
UHNC	Flow	DAILY MX	report only (alert)	all year
UHNC	Flow	MO AVG	report only (alert)	all year
UHNC	Flow	MO AVG	report only (alert)	all year