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Wolf Mountain Coal Inc

Coal And Other Minerals And Ores, Decker, Montana. NPDES permit MT0031411, in force until Dec 31, 2026. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (8 values), form P1 monthly (6 values), form P2 monthly (6 values), form S twice a year, form S1 twice a year, form S2 twice a year
Renewal application due
Jul 4, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 42 reports late

Limits in force (26)

ParameterStatisticLimitMonths
Flow ratevaluereport only (MGD)all year
Flow ratevaluereport only (MGD)all year
Flow ratevaluereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
pHminimum≥ 6 SUall year
pHminimum≥ 6 SUall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHmaximum≤ 9 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 35 mg/Lall year
Solids, total suspendeddaily maximum≤ 70 mg/Lall year
Solids, settleabledaily maximum≤ .05 mL/Lall year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Oil & Greasemaximum≤ 10 mg/Lall year
Iron, total recoverablevaluereport only (mg/L)all year
Iron, total recoverablevaluereport only (mg/L)all year
Iron, total recoverablemonthly average≤ 3 mg/Lall year
Iron, total recoverabledaily maximum≤ 6 mg/Lall year
Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubiavalue≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubiavalue≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubiavalue≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasvalue≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasvalue≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasvalue≤ 0 pass=0;fail=1all year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0031411 · MCP: https://passage-data.com/mcp