MCNARY LOCK AND DAM - USACE

NPDES permit WA0026824 · Minor FEDERAL · effective, expires 2028-06-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

0values over a limit
2required values missing, on 2 form(s)
3of 33 forms filed late

Last period with anything received: 2026-07-31.

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 (15)

OutfallParameterStatisticLimitMonths
021pHINST MIN >= 7 SU all year
021pHINST MAX <= 8.5 SU all year
021pHINST MIN >= 7 SU all year
021pHINST MAX <= 8.5 SU all year
021Oil & GreaseDAILY MX <= 5 mg/L all year
021Oil & GreaseDAILY MX <= 5 mg/L all year
021Flow, in conduit or thru treatment plantMO AVG report only all year
022pHINST MIN >= 7 SU all year
022pHINST MAX <= 8.5 SU all year
022pHINST MIN >= 7 SU all year
022pHINST MAX <= 8.5 SU all year
022Oil & GreaseDAILY MX <= 5 mg/L all year
022Oil & GreaseDAILY MX <= 5 mg/L all year
022Flow, in conduit or thru treatment plantMO AVG report only all year
SUMOil and grease visualINST MAX report only 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