WOLF MOUNTAIN COAL INC

NPDES permit MT0031411 · Minor NON-POTW · effective, expires 2026-12-31 · 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.

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

0values over a limit
0required values missing, on 0 form(s)
0of 42 forms filed late

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

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among MT permits in EPA's filings — check your permit).

Limits in force (26)

OutfallParameterStatisticLimitMonths
001Flow rateVALUE report only all year
001Flow rateVALUE report only all year
001Flow rateVALUE report only all year
001Flow rateDAILY MX report only all year
001pHMINIMUM >= 6 SU all year
001pHMINIMUM >= 6 SU all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 35 mg/L all year
001Solids, total suspendedDAILY MX <= 70 mg/L all year
001Solids, settleableDAILY MX <= .05 mL/L all year
001Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
001Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
001Oil & GreaseMAXIMUM <= 10 mg/L all year
001Iron, total recoverableVALUE report only all year
001Iron, total recoverableVALUE report only all year
001Iron, total recoverableMO AVG <= 3 mg/L all year
001Iron, total recoverableDAILY MX <= 6 mg/L all year
001Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubiaVALUE <= 0 pass=0;fail=1 all year
001Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubiaVALUE <= 0 pass=0;fail=1 all year
001Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubiaVALUE <= 0 pass=0;fail=1 all year
001Pass/Fail Static Renewal 96Hr Acute Pimephales PromelasVALUE <= 0 pass=0;fail=1 all year
001Pass/Fail Static Renewal 96Hr Acute Pimephales PromelasVALUE <= 0 pass=0;fail=1 all year
001Pass/Fail Static Renewal 96Hr Acute Pimephales PromelasVALUE <= 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