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Metal Ores, Big Timber, Montana. NPDES permit MT0026808, in force until Aug 31, 2028. Last 12 months: over a limit 2 times (last January 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | Mercury, total recoverable, daily maximum | .006 ug/L | ≤ .005 ug/L | 20% |
| January 2026 | Mercury, total recoverable, monthly average | .006 ug/L | ≤ .005 ug/L | 20% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 001 |
| Flow rate | monthly average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jul–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .53 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1.94 mg/L | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jul–Sep | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Phosphorus, total [as P] | monthly average | ≤ .6 lb/d | Jul–Sep | 001 |
| Iron, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | monthly average | ≤ 22 ug/L | all year | 001 |
| Nickel, total recoverable | daily maximum | ≤ 13 ug/L | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 15 ug/L | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 29 ug/L | all year | 001 |
| Aluminum, dissolved [as Al] | monthly average | report only (ug/L) | all year | 001 |
| Aluminum, dissolved [as Al] | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | monthly average | ≤ .23 ug/L | all year | 001 |
| Cadmium, total recoverable | daily maximum | ≤ .23 ug/L | all year | 001 |
| Lead, total recoverable | monthly average | ≤ .7 ug/L | all year | 001 |
| Lead, total recoverable | daily maximum | ≤ .7 ug/L | all year | 001 |
| Chromium, total recoverable | value | report only (ug/L) | all year | 001 |
| Copper, total recoverable | monthly average | ≤ .49 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ .93 ug/L | all year | 001 |
| Antimony, total recoverable | value | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | monthly average | ≤ .005 ug/L | all year | 001 |
| Mercury, total recoverable | daily maximum | ≤ .005 ug/L | all year | 001 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | value | ≤ 0 pass=0;fail=1 | all year | 001 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | value | ≤ 0 pass=0;fail=1 | all year | 001 |
| Flow rate | monthly average | report only (MGD) | all year | 002 |
| Flow rate | daily maximum | report only (MGD) | all year | 002 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 002 |
| Iron, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Nickel, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | monthly average | ≤ 24 ug/L | all year | 002 |
| Zinc, total recoverable | daily maximum | ≤ 48 ug/L | all year | 002 |
| Antimony, dissolved [as Sb] | monthly average | report only (ug/L) | all year | 002 |
| Aluminum, dissolved [as Al] | monthly average | report only (ug/L) | all year | 002 |
| Cadmium, total recoverable | monthly average | ≤ .5 ug/L | all year | 002 |
| Cadmium, total recoverable | daily maximum | ≤ .5 ug/L | all year | 002 |
| Lead, total recoverable | monthly average | ≤ 1.1 ug/L | all year | 002 |
| Lead, total recoverable | daily maximum | ≤ 1.1 ug/L | all year | 002 |
| Chromium, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Mercury, total recoverable | monthly average | ≤ .005 ug/L | all year | 002 |
| Mercury, total recoverable | daily maximum | ≤ .005 ug/L | all year | 002 |
| Flow rate | quarterly average | report only (gal/d) | all year | 003 |
| Flow rate | monthly maximum | report only (gal/d) | all year | 003 |
| BOD, 5-day, 20 deg. C | quarterly average | report only (mg/L) | all year | 003 |
| pH | quarterly minimum | report only (SU) | all year | 003 |
| pH | quarterly maximum | report only (SU) | all year | 003 |
| pH | quarterly average | report only (SU) | all year | 003 |
| Solids, total suspended | quarterly average | report only (mg/L) | all year | 003 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | all year | 003 |
| Nitrogen, total [as N] | quarterly average | report only (lb/d) | all year | 003 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | quarterly average | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | quarterly average | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | quarterly average | report only (lb/d) | all year | 003 |
| Phosphorus, total [as P] | quarterly average | report only (mg/L) | all year | 003 |
| Iron, total recoverable | quarterly average | report only (ug/L) | all year | 003 |
| Nickel, total recoverable | quarterly average | report only (ug/L) | all year | 003 |
| Zinc, total recoverable | quarterly average | report only (ug/L) | all year | 003 |
| Aluminum, dissolved [as Al] | quarterly average | report only (ug/L) | all year | 003 |
| Cadmium, total recoverable | quarterly average | report only (ug/L) | all year | 003 |
| Lead, total recoverable | quarterly average | report only (ug/L) | all year | 003 |
| Lead, total recoverable | quarterly average | report only (ug/L) | all year | 003 |
| Chromium, total recoverable | quarterly average | report only (ug/L) | all year | 003 |
| Copper, total recoverable | quarterly average | report only (ug/L) | all year | 003 |
| Copper, total recoverable | quarterly average | report only (ug/L) | all year | 003 |
| Antimony, total recoverable | quarterly average | report only (ug/L) | all year | 003 |
| Mercury, total recoverable | quarterly average | report only (ug/L) | all year | 003 |
| Mercury, total recoverable | quarterly average | report only (ug/L) | all year | 003 |
| Specific conductance | daily maximum | report only (uS/cm) | all year | MW2 |
| pH | daily maximum | report only (SU) | all year | MW2 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | MW2 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | MW2 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | MW2 |
| Water level at sample collection time | daily maximum | report only (ft) | all year | MW2 |
| Specific conductance | daily maximum | report only (uS/cm) | all year | MW3 |
| pH | daily maximum | report only (SU) | all year | MW3 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | MW3 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | MW3 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | MW3 |
| Water level at sample collection time | daily maximum | report only (ft) | all year | MW3 |
| Specific conductance | daily maximum | report only (uS/cm) | all year | MW6 |
| pH | daily maximum | report only (SU) | all year | MW6 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | MW6 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | MW6 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | MW6 |
| Water level at sample collection time | daily maximum | report only (ft) | all year | MW6 |
| Specific conductance | daily maximum | report only (uS/cm) | all year | MW7A |
| pH | daily maximum | report only (SU) | all year | MW7A |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | MW7A |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | MW7A |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | MW7A |
| Water level at sample collection time | daily maximum | report only (ft) | all year | MW7A |
| Specific conductance | daily maximum | report only (uS/cm) | all year | MW8 |
| pH | daily maximum | report only (SU) | all year | MW8 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | MW8 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | MW8 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | MW8 |
| Water level at sample collection time | daily maximum | report only (ft) | all year | MW8 |
| Specific conductance | daily maximum | report only (uS/cm) | all year | MW9 |
| pH | daily maximum | report only (SU) | all year | MW9 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | MW9 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | MW9 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | MW9 |
| Water level at sample collection time | daily maximum | report only (ft) | all year | MW9 |
| Nitrogen, total [as N] | monthly average | ≤ 15.1 lb/d | all year | SUM |
| Iron, total recoverable | monthly average | ≤ 28.5 lb/d | all year | SUM |
| Lead, total recoverable | monthly average | ≤ .005 lb/d | all year | SUM |
| Copper, total recoverable | monthly average | ≤ .061 lb/d | all year | SUM |
| Specific conductance | quarterly average | report only (uS/cm) | all year | WW1 |
| pH | quarterly average | report only (SU) | all year | WW1 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | all year | WW1 |
| Nitrogen, ammonia total [as N] | quarterly average | report only (mg/L) | all year | WW1 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | all year | WW1 |
| Iron, total recoverable | quarterly average | report only (ug/L) | all year | WW1 |
| Nickel, total recoverable | quarterly average | report only (ug/L) | all year | WW1 |
| Zinc, total recoverable | quarterly average | report only (ug/L) | all year | WW1 |
| Antimony, dissolved [as Sb] | quarterly average | report only (ug/L) | all year | WW1 |
| Aluminum, dissolved [as Al] | quarterly average | report only (ug/L) | all year | WW1 |
| Cadmium, total recoverable | quarterly average | report only (ug/L) | all year | WW1 |
| Lead, total recoverable | quarterly average | report only (ug/L) | all year | WW1 |
| Chromium, total recoverable | quarterly average | report only (ug/L) | all year | WW1 |
| Copper, total recoverable | quarterly average | report only (ug/L) | all year | WW1 |
| Mercury, total recoverable | quarterly average | report only (ug/L) | all year | WW1 |
| Water level at sample collection time | quarterly average | report only (ft) | all year | WW1 |
| Parameter | New limit | From | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|---|
| Copper, total recoverable, monthly average | 0.63 ug/L | Aug 1, 2028 | new | 2 ug/L (10 values, 4 below detection) | 3.17× |
| Nitrogen, total [as N], monthly average | 10.8 lb/d | Sep 1, 2027 | new | 1.96 lb/d (10 values) | 0.181× |
| Copper, total recoverable, daily maximum | 1.21 ug/L | Aug 1, 2028 | new | — | — |
Cited limits by parameter: Montana's rules and the federal ones.
Same industry: the 7 Metal 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/MT0026808 · MCP: https://passage-data.com/mcp