PacifiCorp Merwin Hydroelectric Project

NPDES permit WA0041165 · Minor NON-POTW · effective, expires 2028-09-30 · 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 76 forms filed late

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

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (41)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX report only (alert) all year
001Temperature, water deg. centigradeMO AVG report only (alert) all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 8.5 SU all year
001FlowDAILY MX report only (alert) all year
001FlowMO AVG report only (alert) all year
002Temperature, water deg. centigradeDAILY MX report only (alert) all year
002Temperature, water deg. centigradeMO AVG report only (alert) all year
002pHDAILY MN >= 6.5 SU all year
002pHDAILY MX <= 8.5 SU all year
002FlowDAILY MX report only (alert) all year
002FlowMO AVG report only (alert) all year
003Temperature, water deg. centigradeDAILY MX report only (alert) all year
003Temperature, water deg. centigradeMO AVG report only (alert) all year
003pHDAILY MN >= 6.5 SU all year
003pHDAILY MX <= 8.5 SU all year
003FlowDAILY MX report only (alert) all year
003FlowMO AVG report only (alert) all year
AWSTemperature, water deg. centigradeDAILY MX report only (alert) all year
AWSTemperature, water deg. centigradeMO AVG report only (alert) all year
AWSpHDAILY MN >= 6.5 SU all year
AWSpHDAILY MX <= 8.5 SU all year
AWSOil and grease [soxhlet extr.] tot.MO AVG report only (alert) all year
AWSFlowDAILY MX report only (alert) all year
AWSFlowMO AVG report only (alert) all year
OWSOil & GreaseDAILY MX report only (alert) all year
OWSOil & GreaseMO AVG report only (alert) all year
PHS1Temperature, water deg. centigradeDAILY MX report only (alert) all year
PHS1Temperature, water deg. centigradeMO AVG report only (alert) all year
PHS1pHDAILY MN >= 6.5 SU all year
PHS1pHDAILY MX <= 8.5 SU all year
PHS1Oil and grease [soxhlet extr.] tot.MO AVG report only (alert) all year
PHS1FlowDAILY MX report only (alert) all year
PHS1FlowMO AVG report only (alert) all year
PHS2Temperature, water deg. centigradeDAILY MX report only (alert) all year
PHS2Temperature, water deg. centigradeMO AVG report only (alert) all year
PHS2pHDAILY MN >= 6.5 SU all year
PHS2pHDAILY MX <= 8.5 SU all year
PHS2Oil and grease [soxhlet extr.] tot.MO AVG report only (alert) all year
PHS2FlowDAILY MX report only (alert) all year
PHS2FlowMO AVG report only (alert) 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