IDAHO POWER CO

NPDES permit ID0020907 · Minor NON-POTW · effective, expires 2028-08-31 · 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)
8of 88 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 (72)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001pHINST MIN >= 7 SU all year
001pHINST MAX <= 9 SU all year
001Oil & GreaseDAILY MX <= 5 mg/L all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
002Temperature, water deg. centigradeMO AVG report only all year
002Temperature, water deg. centigradeDAILY MX report only all year
002pHINST MIN >= 7 SU all year
002pHINST MAX <= 9 SU all year
002Oil & GreaseDAILY MX <= 5 mg/L all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
003Temperature, water deg. centigradeMO AVG report only all year
003Temperature, water deg. centigradeDAILY MX report only all year
003pHINST MIN >= 7 SU all year
003pHINST MAX <= 9 SU all year
003Oil & GreaseDAILY MX <= 5 mg/L all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
004Temperature, water deg. centigradeMO AVG report only all year
004Temperature, water deg. centigradeDAILY MX report only all year
004pHINST MIN >= 7 SU all year
004pHINST MAX <= 9 SU all year
004Oil & GreaseDAILY MX <= 5 mg/L all year
004Flow, in conduit or thru treatment plantMO AVG report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
005Temperature, water deg. centigradeMO AVG report only all year
005Temperature, water deg. centigradeDAILY MX report only all year
005Temperature, water deg. centigradeMO AVG report only all year
005Temperature, water deg. centigradeDAILY MX report only all year
005Temperature, water deg. centigradeMO AVG report only all year
005Temperature, water deg. centigradeDAILY MX report only all year
005Temperature, water deg. centigradeMO AVG report only all year
005Temperature, water deg. centigradeDAILY MX report only all year
005Temperature, water deg. centigradeMO AVG report only all year
005Temperature, water deg. centigradeDAILY MX report only all year
005Temperature, water deg. centigradeMO AVG report only all year
005Temperature, water deg. centigradeDAILY MX report only all year
005pHINST MIN >= 7 SU all year
005pHDAILY MX <= 9 SU all year
005Oil & GreaseDAILY MX <= 5 mg/L all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
006Temperature, water deg. centigradeDAILY MX report only all year
006pHINST MIN >= 7 SU all year
006pHINST MAX <= 9 SU all year
006Solids, totalMO AVG <= 50 mg/L all year
006Oil & GreaseDAILY MX <= 5 mg/L all year
006Polychlorinated biphenyls [PCBs]DAILY MX report only Mar, Oct
006Flow, in conduit or thru treatment plantDAILY MX report only all year
007Temperature, water deg. centigradeDAILY MX report only all year
007pHINST MIN >= 7 SU all year
007pHINST MAX <= 9 SU all year
007Solids, totalMO AVG <= 50 mg/L all year
007Oil & GreaseDAILY MX <= 5 mg/L all year
007Polychlorinated biphenyls [PCBs]DAILY MX report only Mar, Oct
007Flow, in conduit or thru treatment plantDAILY MX report only all year
SUMThermal DischargeMO AVG <= 10300 MBTU/d all year
SUMFlow, in conduit or thru treatment plantDAILY MX <= 16.4 MGD all year
SUMFlow, in conduit or thru treatment plantDAILY MX <= 1 MGD 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