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Dawn Mining Company LLC

Uranium-Radium-Vanadium Ores, Wellpinit, Washington. NPDES permit WA0026841 expired Dec 31, 2023; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (33 values), form Q quarterly (12 values), form S yearly, form T yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 181 required values missing, 13 of 18 reports late

Limits in force (49)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Flow ratemonthly averagereport only (gal/d)all year
Flow ratedaily maximumreport only (gal/d)all year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Arsenic, total recoverablemonthly average≤ .64 ug/Lall year
Arsenic, total recoverabledaily maximum≤ .64 ug/Lall year
Thallium, total [as Tl]monthly average≤ 6.5 ug/Lall year
Thallium, total [as Tl]daily maximum≤ 13.1 ug/Lall year
Zinc, total recoverablemonthly average≤ 38.5 ug/Lall year
Zinc, total recoverabledaily maximum≤ 56.1 ug/Lall year
Aluminum, total recoverablemonthly average≤ 50 ug/Lall year
Aluminum, total recoverabledaily maximum≤ 93.5 ug/Lall year
Lead, total recoverabledaily maximumreport only (ug/L)all year
Radium 226, totalmonthly average≤ 10 pCi/Lall year
Radium 226, totaldaily maximum≤ 30 pCi/Lall year
Radium 226, dissolvedmonthly average≤ 3 pCi/Lall year
Radium 226, dissolveddaily maximum≤ 10 pCi/Lall year
Manganese, total recoverabledaily maximumreport only (ug/L)all year
Radium 228, totaldaily maximumreport only (pCi/L)all year
Lead 210, totaldaily maximumreport only (pCi/L)all year
Polonium 210daily maximumreport only (pCi/L)all year
Thorium [Thorium-232]daily maximumreport only (pCi/L)all year
Uranium 238, totaldaily maximumreport only (pCi/L)all year
Uranium-234monthly average≤ 41.6 pCi/Lall year
Uranium-234daily maximum≤ 76 pCi/Lall year
Uranium 235, totaldaily maximumreport only (pCi/L)all year
Uranium, dissolveddaily maximumreport only (ug/L)all year
Uranium, total as U3O8monthly average≤ 54.8 ug/Lall year
Uranium, total as U3O8daily maximum≤ 73.2 ug/Lall year
Thorium-234 [Radioactivity Concentration]daily maximumreport only (pCi/L)all year
Lead-212 [Radioactivity Concentration]daily maximumreport only (pCi/L)all year
Floating solids, waste or visible foam-visualmonthly maximum≤ 0 N=0;Y=1all year
Solids, total dissolved [TDS]monthly averagereport only (mg/L)all year
Solids, total dissolved [TDS]daily maximumreport only (mg/L)all year
Mercury, total [as Hg]monthly average≤ .01 ug/Lall year
Mercury, total [as Hg]daily maximum≤ .02 ug/Lall year
Alpha gross radioactivitydaily maximumreport only (pCi/L)all year
Chemical Oxygen Demand [COD]monthly average≤ 200 mg/Lall year
Chemical Oxygen Demand [COD]daily maximum≤ 100 mg/Lall year
Sulfatemonthly averagereport only (mg/L)all year
Sulfatedaily maximumreport only (mg/L)all year
Toxicity, Acutedaily maximumreport only (toxic)all year
Toxicity, Acutedaily maximumreport only (toxic)all year
Toxicity, Chronicdaily maximumreport only (toxic)all year
Toxicity, Chronicdaily maximumreport only (toxic)all year

How strict are these limits?

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

Same industry: the 3 Metal Mining permits in Washington.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WA0026841 · MCP: https://passage-data.com/mcp