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Bituminous Coal And Lignite - Surface, major discharger, Decker, Montana. NPDES permit MT0024210 expired Apr 30, 2017; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | all year |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year |
| Flow rate | 30-day average | report only (MGD) | all year |
| Flow rate | instantaneous maximum | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| Specific conductance | 30-day average | report only (umho/cm) | all year |
| Specific conductance | daily maximum | report only (umho/cm) | all year |
| Specific conductance | daily maximum | report only (umho/cm) | all year |
| Specific conductance | daily maximum | report only (umho/cm) | all year |
| Sulfate [as S] | 30-day average | report only (mg/L) | all year |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 35 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 70 mg/L | all year |
| Solids, settleable | daily maximum | ≤ .5 mL/L | all year |
| Oil and grease, hexane extr method | instantaneous maximum | ≤ 10 mg/L | all year |
| Oil and grease, hexane extr method | instantaneous maximum | ≤ 10 mg/L | all year |
| Oil and grease, hexane extr method | instantaneous maximum | ≤ 10 mg/L | all year |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | 30-day average | ≤ 44.54 lb/d | all year |
| Nitrogen, total [as N] | daily maximum | ≤ 72.91 lb/d | all year |
| Nitrogen, total [as N] | daily maximum | ≤ 72.91 lb/d | all year |
| Nitrogen, total [as N] | daily maximum | ≤ 72.91 lb/d | all year |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | 30-day average | ≤ .45 mg/L | all year |
| Phosphorus, total [as P] | daily maximum | ≤ .82 mg/L | all year |
| Phosphorus, total [as P] | daily maximum | ≤ .82 mg/L | all year |
| Phosphorus, total [as P] | daily maximum | ≤ .82 mg/L | all year |
| Sodium adsorption ratio | 30-day average | ≤ 17.8 Ratio | all year |
| Sodium adsorption ratio | daily maximum | ≤ 20.6 Ratio | all year |
| Sodium adsorption ratio | daily maximum | ≤ 20.6 Ratio | all year |
| Sodium adsorption ratio | daily maximum | ≤ 20.6 Ratio | all year |
| Arsenic, total recoverable | 30-day average | report only (mg/L) | all year |
| Arsenic, total recoverable | daily maximum | report only (mg/L) | all year |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year |
| Copper, total [as Cu] | 30-day average | report only (mg/L) | all year |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year |
| Iron, total [as Fe] | 30-day average | ≤ 3.5 mg/L | all year |
| Iron, total [as Fe] | daily maximum | ≤ 7 mg/L | all year |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year |
| Manganese, total [as Mn] | monthly average | report only (mg/L) | all year |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year |
| Nickel, total recoverable | 30-day average | report only (ug/L) | all year |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year |
| Silver total recoverable | 30-day average | report only (ug/L) | all year |
| Silver total recoverable | daily maximum | report only (ug/L) | all year |
| Silver total recoverable | daily maximum | report only (ug/L) | all year |
| Silver total recoverable | daily maximum | report only (ug/L) | all year |
| Strontium, total [as Sr] | 30-day average | report only (mg/L) | all year |
| Strontium, total [as Sr] | daily maximum | report only (mg/L) | all year |
| Strontium, total [as Sr] | daily maximum | report only (mg/L) | all year |
| Strontium, total [as Sr] | daily maximum | report only (mg/L) | all year |
| Zinc, total recoverable | 30-day average | report only (ug/L) | all year |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year |
| Aluminum, total [as Al] | 30-day average | report only (mg/L) | all year |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year |
| Aluminum, dissolved [as Al] | 30-day average | ≤ .5 mg/L | all year |
| Aluminum, dissolved [as Al] | daily maximum | ≤ .7 mg/L | all year |
| Aluminum, dissolved [as Al] | daily maximum | ≤ .7 mg/L | all year |
| Aluminum, dissolved [as Al] | daily maximum | ≤ .7 mg/L | all year |
| Cadmium, total recoverable | 30-day average | report only (ug/L) | all year |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year |
| Lead, total recoverable | 30-day average | report only (ug/L) | all year |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year |
| Lead, total recoverable | per discharge | report only (ug/L) | all year |
| Chromium, total recoverable | 30-day average | report only (ug/L) | all year |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year |
| Copper, total recoverable | 30-day average | report only (ug/L) | all year |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year |
| Solids, total dissolved [TDS] | 30-day average | report only (mg/L) | all year |
| Solids, total dissolved [TDS] | daily maximum | report only (mg/L) | all year |
| Solids, total dissolved [TDS] | daily maximum | report only (mg/L) | all year |
| Solids, total dissolved [TDS] | daily maximum | report only (mg/L) | all year |
| Mercury, total recoverable | 30-day average | report only (ug/L) | all year |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year |
| Report due [yrmoda] | value | ≤ 1 abst=0;prst=1 | all year |
| Report due [yrmoda] | value | ≤ 1 abst=0;prst=1 | all year |
| Report due [yrmoda] | value | ≤ 1 abst=0;prst=1 | all year |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | single sample | ≤ 0 pass=0;fail=1 | Jul–Dec |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | single sample | ≤ 0 pass=0;fail=1 | Jul–Dec |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | single sample | ≤ 0 pass=0;fail=1 | Jul–Dec |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | single sample | ≤ 0 pass=0;fail=1 | Jan–Jun |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | single sample | ≤ 0 pass=0;fail=1 | Jan–Jun |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | single sample | ≤ 0 pass=0;fail=1 | Jan–Jun |
Cited limits by parameter: Montana's rules and the federal ones.
Same industry: the 9 Coal Mining permits in Montana.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MT0024210 · MCP: https://passage-data.com/mcp