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Kennecott Uranium Company

Uranium-Radium-Vanadium Ores, major discharger, Unknown, Wyoming. NPDES permit WY0025950 expired Jun 30, 2023; its limits still apply. Last 12 months: no values over a limit, 8 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form MQ quarterly (13 values), form QQ quarterly (8 values)
Last report on file
July 2026
Oct 2024 – Sep 2025
0 values over a limit, 34 required values missing, 12 of 16 reports late

Limits in force (21)

ParameterStatisticLimitMonths
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Zinc, dissolved [as Zn]daily maximum≤ 23 ug/Lall year
Zinc, total [as Zn]monthly average≤ .5 mg/Lall year
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year
Selenium, total [as Se]daily maximum≤ 1 ug/Lall year
Radium 226, totaldaily maximum≤ 5 pCi/Lall year
Radium 226, dissolvedmonthly average≤ 3 pCi/Lall year
Radium 226, dissolveddaily maximum≤ 10 pCi/Lall year
Uranium, totalmonthly average≤ 2 mg/Lall year
Uranium, totaldaily maximum≤ 4 mg/Lall year
Durationmonthly totalreport only (d)all year
Flowmonthly averagereport only (MGD)all year
Flowdaily maximumreport only (MGD)all year
Chemical Oxygen Demand [COD]monthly average≤ 100 mg/Lall year
Chemical Oxygen Demand [COD]daily maximum≤ 200 mg/Lall year
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year
Pass/Fail Static 96 Hr Acute Pimephales Promelasdaily maximum= 0 pass=0;fail=1all year
Pass/Fail Static 24Hr Acute Ceriodaphnia Dubiadaily maximum= 0 pass=0;fail=1all year

How strict are these limits?

Cited limits by parameter: Wyoming's rules and the federal ones.

Same industry: the 3 Metal Mining permits in Wyoming.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WY0025950 · MCP: https://passage-data.com/mcp