USCOE - Big Bend Dam

NPDES permit SD0026361 · Minor FEDERAL · effective, expires 2028-12-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

0values over a limit

0required values missing, on 0 form(s)

0of 12 forms filed late

Last period with anything received: 2026-08-31.

Reporting

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

Outfall 004, form A (Any discharge to Lake Francis Case from the station drainage/unwatering pumps): every 1 month(s), 8 values

Limits in force (8)

Outfall	Parameter	Statistic	Limit	Months
004	Temperature, water deg. centigrade	30DA AVG	report only	all year
004	Temperature, water deg. centigrade	DAILY MX	report only	all year
004	Flow rate	MO AVG	report only	all year
004	pH	DAILY MN	>= 6.5 SU	all year
004	pH	DAILY MX	<= 9 SU	all year
004	Oil and grease, hexane extr method	DAILY MX	<= 1 mg/L	all year
004	Floating solids, waste or visible foam-visual	DAILY MX	<= 0 abst=0;prst=1	all year
004	Oil and grease visual	DAILY MX	<= 0 abst=0;prst=1	all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states