USCOE - Oahe Dam

NPDES permit SD0026794 · Minor FEDERAL · effective, expires 2027-03-31 · 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)
11of 22 forms filed late

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

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (18)

OutfallParameterStatisticLimitMonths
007Temperature, water deg. centigrade30DA AVG report only all year
007Temperature, water deg. centigradeDAILY MX report only all year
007Flow rate30DA AVG report only all year
007Flow rateDAILY MX report only all year
007pHDAILY MN >= 6.6 SU all year
007pHDAILY MX <= 8.6 SU all year
007Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
007Floating solids, waste or visible foam-visualDAILY MX < 1 N=0;Y=1 all year
007Oil and grease visualDAILY MX < 1 N=0;Y=1 all year
014Temperature, water deg. centigrade30DA AVG report only all year
014Temperature, water deg. centigradeDAILY MX report only all year
014Flow rate30DA AVG report only all year
014Flow rateDAILY MX report only all year
014pHDAILY MN >= 6.6 SU all year
014pHDAILY MX <= 8.6 SU all year
014Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
014Floating solids, waste or visible foam-visualDAILY MX < 1 N=0;Y=1 all year
014Oil and grease visualDAILY MX < 1 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