Kennecott Uranium Company

NPDES permit WY0025950 · Major NON-POTW · expired, expires 2023-06-30 · 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.

This permit expired on 2023-06-30 and is expired: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

0values over a limit
0required values missing, on 0 form(s)
10of 15 forms filed late

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

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 (21)

OutfallParameterStatisticLimitMonths
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 20 mg/L all year
001Solids, total suspendedDAILY MX <= 30 mg/L all year
001Zinc, dissolved [as Zn]DAILY MX <= 23 ug/L all year
001Zinc, total [as Zn]MO AVG <= .5 mg/L all year
001Zinc, total [as Zn]DAILY MX <= 1 mg/L all year
001Selenium, total [as Se]DAILY MX <= 1 ug/L all year
001Radium 226, totalDAILY MX <= 5 pCi/L all year
001Radium 226, dissolvedMO AVG <= 3 pCi/L all year
001Radium 226, dissolvedDAILY MX <= 10 pCi/L all year
001Uranium, totalMO AVG <= 2 mg/L all year
001Uranium, totalDAILY MX <= 4 mg/L all year
001DurationMO TOTAL report only all year
001FlowMO AVG report only all year
001FlowDAILY MX report only all year
001Chemical Oxygen Demand [COD]MO AVG <= 100 mg/L all year
001Chemical Oxygen Demand [COD]DAILY MX <= 200 mg/L all year
001Produced water, oil and greaseDAILY MX <= 10 mg/L all year
001Pass/Fail Static 96 Hr Acute Pimephales PromelasDAILY MX = 0 pass=0;fail=1 all year
001Pass/Fail Static 24Hr Acute Ceriodaphnia DubiaDAILY MX = 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