Pacificorp/Naughton Plant

NPDES permit WY0020311 · Minor NON-POTW · effective, expires 2030-03-31 · 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

4values over a limit
18required values missing, on 10 form(s)
8of 37 forms filed late

Last period with anything received: 2026-06-30. Most often over: Chlorine, total residual (3), Selenium, total [as Se] (1).

Reporting

Reports are due about 29 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (59)

OutfallParameterStatisticLimitMonths
003BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
003BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
003BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
003BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
003pHINST MIN >= 6.5 SU all year
003pHINST MIN >= 6.5 SU all year
003pHINST MAX <= 9 SU all year
003pHINST MAX <= 9 SU all year
003Solids, total suspendedMO AVG <= 30 mg/L all year
003Solids, total suspendedMO AVG <= 30 mg/L all year
003Solids, total suspendedDAILY MX <= 45 mg/L all year
003Solids, total suspendedDAILY MX <= 45 mg/L all year
003Phosphorus, total [as P]DAILY MX report only all year
003Phosphorus, total [as P]DAILY MX report only all year
003Chromium, total [as Cr]MO AVG <= .2 mg/L all year
003Chromium, total [as Cr]MO AVG <= .2 mg/L all year
003Chromium, total [as Cr]DAILY MX <= .2 mg/L all year
003Chromium, total [as Cr]DAILY MX <= .2 mg/L all year
003Copper, total [as Cu]MO AVG <= 1 mg/L all year
003Copper, total [as Cu]MO AVG <= 1 mg/L all year
003Copper, total [as Cu]DAILY MX <= 1 mg/L all year
003Copper, total [as Cu]DAILY MX <= 1 mg/L all year
003Iron, total [as Fe]MO AVG <= 1 mg/L all year
003Iron, total [as Fe]MO AVG <= 1 mg/L all year
003Iron, total [as Fe]DAILY MX <= 1 mg/L all year
003Iron, total [as Fe]DAILY MX <= 1 mg/L all year
003Zinc, total [as Zn]DAILY MX <= 1 mg/L all year
003Zinc, total [as Zn]DAILY MX <= 1 mg/L all year
003Zinc, total [as Zn]MO AVG <= 1 mg/L all year
003Zinc, total [as Zn]MO AVG <= 1 mg/L all year
003Selenium, total [as Se]DAILY MX <= 5 ug/L all year
003Selenium, total [as Se]DAILY MX <= 5 ug/L all year
003DurationMO TOTAL report only all year
003DurationMO TOTAL report only all year
003Chlorine, total residualDAILY MX <= .019 mg/L all year
003Chlorine, total residualDAILY MX <= .019 mg/L all year
003E. coliDAILY MX report only all year
003E. coliMO AVG report only all year
003Nitrogen, Ammonia TotalDAILY MX report only all year
003Nitrogen, Ammonia TotalMO AVG report only all year
003Solids, total dissolvedDAILY MX report only all year
003Solids, total dissolvedDAILY MX report only all year
003Solids, total dissolvedANNL TOT report only all year
003Solids, total dissolvedMO AVG report only all year
003Solids, total dissolvedMO AVG report only all year
003Solids, total dissolvedDAILY MX report only all year
003Solids, total dissolvedDAILY MX report only all year
003FlowMO AVG report only all year
003FlowMO AVG report only all year
003FlowWKLY AVG report only all year
003FlowWKLY AVG report only all year
003FlowDAILY MX report only all year
003FlowDAILY MX report only all year
003Produced water, oil and greaseDAILY MX <= 10 mg/L all year
003Produced water, oil and greaseDAILY MX <= 10 mg/L all year
003Pass/Fail Static 48Hr Acute Ceriodaphnia dubia4C <= 0 pass=0;fail=1 all year
003Pass/Fail Static 96 Hr Acute Pimephales Promelas9D <= 0 pass=0;fail=1 all year
003Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7E <= 0 pass=0;fail=1 all year
003Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7E <= 0 pass=0;fail=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