LOWER GRANITE LOCK AND DAM - USACE — NPDES permit WA0026794: limits, due date and EPA's record

NPDES permit WA0026794 · Minor FEDERAL · effective, expires 2027-03-31 · EPA's file as of 2026-09-19

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

Reporting

Reports are due about 20 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (158)

Outfall	Parameter	Statistic	Limit	Months
001	Temperature, water deg. centigrade	7E	report only	all year
001	Temperature, water deg. centigrade	MX DA AV	report only	all year
001	Temperature, water deg. centigrade	MO MAX	report only	all year
001	Temperature, water deg. centigrade	MO AVG	report only	all year
001	pH	INST MIN	>= 6.5 SU	all year
001	pH	INST MAX	<= 8.5 SU	all year
001	pH	INST MIN	>= 6.5 SU	all year
001	pH	INST MAX	<= 8.5 SU	all year
001	Oil & Grease	DAILY MX	<= 5 mg/L	all year
001	Oil & Grease	DAILY MX	<= 5 mg/L	all year
001	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
002	Temperature, water deg. centigrade	7E	report only	all year
002	Temperature, water deg. centigrade	MX DA AV	report only	all year
002	Temperature, water deg. centigrade	MO MAX	report only	all year
002	Temperature, water deg. centigrade	MO AVG	report only	all year
002	pH	INST MIN	>= 6.5 SU	all year
002	pH	INST MAX	<= 8.5 SU	all year
002	pH	INST MIN	>= 6.5 SU	all year
002	pH	INST MAX	<= 8.5 SU	all year
002	Oil & Grease	DAILY MX	<= 5 mg/L	all year
002	Oil & Grease	DAILY MX	<= 5 mg/L	all year
002	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003	Temperature, water deg. centigrade	MX DA AV	report only	all year
003	Temperature, water deg. centigrade	MX 7D AV	report only	all year
003	Temperature, water deg. centigrade	MO AVG	report only	all year
003	Temperature, water deg. centigrade	MO MAX	report only	all year
003	Temperature, water deg. centigrade	7E	report only	all year
003	Temperature, water deg. centigrade	MX DA AV	report only	all year
003	Temperature, water deg. centigrade	MO MAX	report only	all year
003	Temperature, water deg. centigrade	MO AVG	report only	all year
003	pH	INST MIN	>= 6.5 SU	all year
003	pH	INST MAX	<= 8.5 SU	all year
003	pH	INST MIN	>= 6.5 SU	all year
003	pH	INST MAX	<= 8.5 SU	all year
003	Oil & Grease	DAILY MX	<= 5 mg/L	all year
003	Oil & Grease	DAILY MX	<= 5 mg/L	all year
003	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003A	Temperature, water deg. centigrade	MX DA AV	report only	all year
003A	Temperature, water deg. centigrade	MX 7D AV	report only	all year
003A	Temperature, water deg. centigrade	MO AVG	report only	all year
003A	Temperature, water deg. centigrade	MO MAX	report only	all year
003A	Temperature, water deg. centigrade	7E	report only	all year
003A	Temperature, water deg. centigrade	MX DA AV	report only	all year
003A	Temperature, water deg. centigrade	MO AVG	report only	all year
003A	Temperature, water deg. centigrade	MO AVG	report only	all year
003A	pH	INST MIN	>= 6.5 SU	all year
003A	pH	INST MAX	<= 8.5 SU	all year
003A	pH	INST MIN	>= 6.5 SU	all year
003A	pH	INST MAX	<= 8.5 SU	all year
003A	Oil & Grease	DAILY MX	<= 5 mg/L	all year
003A	Oil & Grease	DAILY MX	<= 5 mg/L	all year
003A	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
004	Temperature, water deg. centigrade	MX DA AV	report only	all year
004	Temperature, water deg. centigrade	MX 7D AV	report only	all year
004	Temperature, water deg. centigrade	MO AVG	report only	all year
004	Temperature, water deg. centigrade	MO MAX	report only	all year
004	Temperature, water deg. centigrade	7E	report only	all year
004	Temperature, water deg. centigrade	MX DA AV	report only	all year
004	Temperature, water deg. centigrade	MO MAX	report only	all year
004	Temperature, water deg. centigrade	MO AVG	report only	all year
004	pH	INST MIN	>= 6.5 SU	all year
004	pH	INST MAX	<= 8.5 SU	all year
004	pH	INST MIN	>= 6.5 SU	all year
004	pH	INST MAX	<= 8.5 SU	all year
004	Oil & Grease	DAILY MX	<= 5 mg/L	all year
004	Oil & Grease	DAILY MX	<= 5 mg/L	all year
004	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
005	Temperature, water deg. centigrade	MX DA AV	report only	all year
005	Temperature, water deg. centigrade	MX 7D AV	report only	all year
005	Temperature, water deg. centigrade	MO AVG	report only	all year
005	Temperature, water deg. centigrade	MO MAX	report only	all year
005	Temperature, water deg. centigrade	7E	report only	all year
005	Temperature, water deg. centigrade	MX DA AV	report only	all year
005	Temperature, water deg. centigrade	MO MAX	report only	all year
005	Temperature, water deg. centigrade	MO AVG	report only	all year
005	pH	INST MIN	>= 6.5 SU	all year
005	pH	INST MAX	<= 8.5 SU	all year
005	pH	INST MIN	>= 6.5 SU	all year
005	pH	INST MAX	<= 8.5 SU	all year
005	Oil & Grease	DAILY MX	<= 5 mg/L	all year
005	Oil & Grease	DAILY MX	<= 5 mg/L	all year
005	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
006	Temperature, water deg. centigrade	MX DA AV	report only	all year
006	Temperature, water deg. centigrade	MX 7D AV	report only	all year
006	Temperature, water deg. centigrade	MO AVG	report only	all year
006	Temperature, water deg. centigrade	MO MAX	report only	all year
006	Temperature, water deg. centigrade	7E	report only	all year
006	Temperature, water deg. centigrade	MX DA AV	report only	all year
006	Temperature, water deg. centigrade	MO MAX	report only	all year
006	Temperature, water deg. centigrade	MO AVG	report only	all year
006	pH	INST MIN	>= 6.5 SU	all year
006	pH	INST MAX	<= 8.5 SU	all year
006	pH	INST MIN	>= 6.5 SU	all year
006	pH	INST MAX	<= 8.5 SU	all year
006	Oil & Grease	DAILY MX	<= 5 mg/L	all year
006	Oil & Grease	DAILY MX	<= 5 mg/L	all year
006	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
007	Temperature, water deg. centigrade	MX DA AV	report only	all year
007	Temperature, water deg. centigrade	MX 7D AV	report only	all year
007	Temperature, water deg. centigrade	MO AVG	report only	all year
007	Temperature, water deg. centigrade	MO MAX	report only	all year
007	Temperature, water deg. centigrade	7E	report only	all year
007	Temperature, water deg. centigrade	MX DA AV	report only	all year
007	Temperature, water deg. centigrade	MO MAX	report only	all year
007	Temperature, water deg. centigrade	MO AVG	report only	all year
007	pH	INST MIN	>= 6.5 SU	all year
007	pH	INST MAX	<= 8.5 SU	all year
007	pH	INST MIN	>= 6.5 SU	all year
007	pH	INST MAX	<= 8.5 SU	all year
007	Oil & Grease	DAILY MX	<= 5 mg/L	all year
007	Oil & Grease	DAILY MX	<= 5 mg/L	all year
007	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
008	Temperature, water deg. centigrade	MX DA AV	report only	all year
008	Temperature, water deg. centigrade	MX 7D AV	report only	all year
008	Temperature, water deg. centigrade	MO AVG	report only	all year
008	Temperature, water deg. centigrade	MO MAX	report only	all year
008	Temperature, water deg. centigrade	7E	report only	all year
008	Temperature, water deg. centigrade	MX DA AV	report only	all year
008	Temperature, water deg. centigrade	MO MAX	report only	all year
008	Temperature, water deg. centigrade	MO AVG	report only	all year
008	pH	INST MIN	>= 6.5 SU	all year
008	pH	INST MAX	<= 8.5 SU	all year
008	pH	INST MIN	>= 6.5 SU	all year
008	pH	INST MAX	<= 8.5 SU	all year
008	Oil & Grease	DAILY MX	<= 5 mg/L	all year
008	Oil & Grease	DAILY MX	<= 5 mg/L	all year
008	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
009	Temperature, water deg. centigrade	MX DA AV	report only	all year
009	Temperature, water deg. centigrade	MX 7D AV	report only	all year
009	Temperature, water deg. centigrade	MO AVG	report only	all year
009	Temperature, water deg. centigrade	MO MAX	report only	all year
009	Temperature, water deg. centigrade	7E	report only	all year
009	Temperature, water deg. centigrade	MX DA AV	report only	all year
009	Temperature, water deg. centigrade	MO MAX	report only	all year
009	Temperature, water deg. centigrade	MO AVG	report only	all year
009	pH	INST MIN	>= 6.5 SU	all year
009	pH	INST MAX	<= 8.5 SU	all year
009	pH	INST MIN	>= 6.5 SU	all year
009	pH	INST MAX	<= 8.5 SU	all year
009	Oil & Grease	DAILY MX	<= 5 mg/L	all year
009	Oil & Grease	DAILY MX	<= 5 mg/L	all year
009	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
011	pH	INST MIN	>= 6.5 SU	all year
011	pH	INST MAX	<= 8.5 SU	all year
011	pH	INST MIN	>= 6.5 SU	all year
011	pH	INST MAX	<= 8.5 SU	all year
011	Oil & Grease	DAILY MX	<= 5 mg/L	all year
011	Oil & Grease	DAILY MX	<= 5 mg/L	all year
011	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
012	pH	INST MIN	>= 6.5 SU	all year
012	pH	INST MAX	<= 8.5 SU	all year
012	pH	INST MIN	>= 6.5 SU	all year
012	pH	INST MAX	<= 8.5 SU	all year
012	Oil & Grease	DAILY MX	<= 5 mg/L	all year
012	Oil & Grease	DAILY MX	<= 5 mg/L	all year
012	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
SUM	Thermal Discharge	MO AVG	<= 2250 mkcal/day	Jun, Jul, Aug, Sep, Oct
SUM	Oil and grease visual	INST MAX	report only	all year