DAWN MINING COMPANY LLC

NPDES permit WA0026841 · Minor NON-POTW · administratively continued, expires 2023-12-31 · 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.

This permit expired on 2023-12-31 and is administratively continued: 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)
0of 18 forms filed late

Last period with anything received: 2026-08-31.

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 (49)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Flow rateMO AVG report only all year
001Flow rateDAILY MX report only all year
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 8.5 SU all year
001Solids, total suspendedMO AVG <= 20 mg/L all year
001Solids, total suspendedDAILY MX <= 30 mg/L all year
001Arsenic, total recoverableMO AVG <= .64 ug/L all year
001Arsenic, total recoverableDAILY MX <= .64 ug/L all year
001Thallium, total [as Tl]MO AVG <= 6.5 ug/L all year
001Thallium, total [as Tl]DAILY MX <= 13.1 ug/L all year
001Zinc, total recoverableMO AVG <= 38.5 ug/L all year
001Zinc, total recoverableDAILY MX <= 56.1 ug/L all year
001Aluminum, total recoverableMO AVG <= 50 ug/L all year
001Aluminum, total recoverableDAILY MX <= 93.5 ug/L all year
001Lead, total recoverableDAILY MX report only all year
001Radium 226, totalMO AVG <= 10 pCi/L all year
001Radium 226, totalDAILY MX <= 30 pCi/L all year
001Radium 226, dissolvedMO AVG <= 3 pCi/L all year
001Radium 226, dissolvedDAILY MX <= 10 pCi/L all year
001Manganese, total recoverableDAILY MX report only all year
001Radium 228, totalDAILY MX report only all year
001Lead 210, totalDAILY MX report only all year
001Polonium 210DAILY MX report only all year
001Thorium [Thorium-232]DAILY MX report only all year
001Uranium 238, totalDAILY MX report only all year
001Uranium-234MO AVG <= 41.6 pCi/L all year
001Uranium-234DAILY MX <= 76 pCi/L all year
001Uranium 235, totalDAILY MX report only all year
001Uranium, dissolvedDAILY MX report only all year
001Uranium, total as U3O8MO AVG <= 54.8 ug/L all year
001Uranium, total as U3O8DAILY MX <= 73.2 ug/L all year
001Thorium-234 [Radioactivity Concentration]DAILY MX report only all year
001Lead-212 [Radioactivity Concentration]DAILY MX report only all year
001Floating solids, waste or visible foam-visualMO MAX <= 0 N=0;Y=1 all year
001Solids, total dissolved [TDS]MO AVG report only all year
001Solids, total dissolved [TDS]DAILY MX report only all year
001Mercury, total [as Hg]MO AVG <= .01 ug/L all year
001Mercury, total [as Hg]DAILY MX <= .02 ug/L all year
001Alpha gross radioactivityDAILY MX report only all year
001Chemical Oxygen Demand [COD]MO AVG <= 200 mg/L all year
001Chemical Oxygen Demand [COD]DAILY MX <= 100 mg/L all year
001SulfateMO AVG report only all year
001SulfateDAILY MX report only all year
001Toxicity, AcuteDAILY MX report only all year
001Toxicity, AcuteDAILY MX report only all year
001Toxicity, ChronicDAILY MX report only all year
001Toxicity, ChronicDAILY MX report only 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