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Silver Ores, Libby, Montana. NPDES permit MT0030279 expired Dec 31, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Flow rate | monthly average | report only (gal/min) | all year | 001 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | 001 |
| Oil and grease, hexane extr method | instantaneous maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, inorganic total | monthly average | ≤ 2.5 mg/L | all year | 001 |
| Nitrogen, inorganic total | instantaneous maximum | report only (mg/L) | all year | 001 |
| Nitrogen, inorganic total | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, inorganic total | annual average | ≤ 15 lb/d | all year | 001 |
| Iron, total recoverable | average | ≤ .25 mg/L | all year | 001 |
| Iron, total recoverable | instantaneous maximum | ≤ .38 mg/L | all year | 001 |
| Iron, total recoverable | monthly average | report only (lb/d) | all year | 001 |
| Iron, total recoverable | annual average | ≤ 1.5 lb/d | all year | 001 |
| Zinc, total recoverable | average | ≤ .1 mg/L | all year | 001 |
| Zinc, total recoverable | instantaneous maximum | ≤ .15 mg/L | all year | 001 |
| Zinc, total recoverable | monthly average | report only (lb/d) | all year | 001 |
| Zinc, total recoverable | annual average | ≤ .66 lb/d | all year | 001 |
| Cadmium, total recoverable | average | ≤ .0008 mg/L | all year | 001 |
| Cadmium, total recoverable | instantaneous maximum | ≤ .0012 mg/L | all year | 001 |
| Cadmium, total recoverable | monthly average | report only (lb/d) | all year | 001 |
| Cadmium, total recoverable | annual average | ≤ .005 lb/d | all year | 001 |
| Lead, total recoverable | average | ≤ .003 mg/L | all year | 001 |
| Lead, total recoverable | instantaneous maximum | ≤ .003 mg/L | all year | 001 |
| Lead, total recoverable | monthly average | report only (lb/d) | all year | 001 |
| Lead, total recoverable | annual average | ≤ .004 lb/d | all year | 001 |
| Chromium, total recoverable | average | ≤ .13 mg/L | all year | 001 |
| Chromium, total recoverable | instantaneous maximum | ≤ .02 mg/L | all year | 001 |
| Chromium, total recoverable | monthly average | report only (lb/d) | all year | 001 |
| Chromium, total recoverable | annual average | ≤ .078 lb/d | all year | 001 |
| Copper, total recoverable | average | ≤ .007 mg/L | all year | 001 |
| Copper, total recoverable | instantaneous maximum | ≤ .01 mg/L | all year | 001 |
| Copper, total recoverable | monthly average | report only (lb/d) | all year | 001 |
| Copper, total recoverable | annual average | ≤ .042 lb/d | all year | 001 |
| Manganese, total recoverable | average | ≤ .11 mg/L | all year | 001 |
| Manganese, total recoverable | instantaneous maximum | ≤ .15 mg/L | all year | 001 |
| Manganese, total recoverable | monthly average | report only (lb/d) | all year | 001 |
| Manganese, total recoverable | annual average | ≤ .66 lb/d | all year | 001 |
| Mercury, total recoverable | average | ≤ .0006 mg/L | all year | 001 |
| Mercury, total recoverable | instantaneous maximum | ≤ .0006 mg/L | all year | 001 |
| Mercury, total recoverable | monthly average | report only (lb/d) | all year | 001 |
| Mercury, total recoverable | annual average | report only (lb/d) | all year | 001 |
| Sulfate | average | report only (mg/L) | all year | 001 |
| Sulfate | instantaneous maximum | report only (mg/L) | all year | 001 |
| Oil and grease visual | value | report only (Y=0;N=1) | all year | 001 |
| Flow rate | monthly average | report only (gal/min) | all year | 002 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | 002 |
| Oil and grease, hexane extr method | instantaneous maximum | ≤ 10 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 002 |
| Nitrogen, inorganic total | monthly average | ≤ 2.5 mg/L | all year | 002 |
| Nitrogen, inorganic total | instantaneous maximum | report only (mg/L) | all year | 002 |
| Nitrogen, inorganic total | monthly average | report only (lb/d) | all year | 002 |
| Nitrogen, inorganic total | annual average | ≤ 15 lb/d | all year | 002 |
| Iron, total recoverable | average | ≤ .25 mg/L | all year | 002 |
| Iron, total recoverable | instantaneous maximum | ≤ .38 mg/L | all year | 002 |
| Iron, total recoverable | monthly average | report only (lb/d) | all year | 002 |
| Iron, total recoverable | annual average | ≤ 1.5 lb/d | all year | 002 |
| Zinc, total recoverable | average | ≤ .1 mg/L | all year | 002 |
| Zinc, total recoverable | instantaneous maximum | ≤ .15 mg/L | all year | 002 |
| Zinc, total recoverable | monthly average | report only (lb/d) | all year | 002 |
| Zinc, total recoverable | annual average | ≤ .66 lb/d | all year | 002 |
| Cadmium, total recoverable | average | ≤ .0008 mg/L | all year | 002 |
| Cadmium, total recoverable | instantaneous maximum | ≤ .0012 mg/L | all year | 002 |
| Cadmium, total recoverable | monthly average | report only (lb/d) | all year | 002 |
| Cadmium, total recoverable | annual average | ≤ .005 lb/d | all year | 002 |
| Lead, total recoverable | average | ≤ .003 mg/L | all year | 002 |
| Lead, total recoverable | instantaneous maximum | ≤ .003 mg/L | all year | 002 |
| Lead, total recoverable | monthly average | report only (lb/d) | all year | 002 |
| Lead, total recoverable | annual average | ≤ .004 lb/d | all year | 002 |
| Chromium, total recoverable | average | ≤ .13 mg/L | all year | 002 |
| Chromium, total recoverable | instantaneous maximum | ≤ .02 mg/L | all year | 002 |
| Chromium, total recoverable | monthly average | report only (lb/d) | all year | 002 |
| Chromium, total recoverable | annual average | ≤ .078 lb/d | all year | 002 |
| Copper, total recoverable | average | ≤ .007 mg/L | all year | 002 |
| Copper, total recoverable | instantaneous maximum | ≤ .01 mg/L | all year | 002 |
| Copper, total recoverable | monthly average | report only (lb/d) | all year | 002 |
| Copper, total recoverable | annual average | ≤ .042 lb/d | all year | 002 |
| Manganese, total recoverable | average | ≤ .11 mg/L | all year | 002 |
| Manganese, total recoverable | instantaneous maximum | ≤ .15 mg/L | all year | 002 |
| Manganese, total recoverable | monthly average | report only (lb/d) | all year | 002 |
| Manganese, total recoverable | annual average | ≤ .66 lb/d | all year | 002 |
| Mercury, total recoverable | average | ≤ .0006 mg/L | all year | 002 |
| Mercury, total recoverable | instantaneous maximum | ≤ .0006 mg/L | all year | 002 |
| Mercury, total recoverable | monthly average | report only (lb/d) | all year | 002 |
| Mercury, total recoverable | annual average | report only (lb/d) | all year | 002 |
| Sulfate | average | report only (mg/L) | all year | 002 |
| Sulfate | instantaneous maximum | report only (mg/L) | all year | 002 |
| Oil and grease visual | value | report only (Y=0;N=1) | all year | 002 |
| Temperature, water deg. fahrenheit | value | report only (deg F) | all year | 003 |
| Flow rate | monthly average | report only (gal/min) | all year | 003 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | 003 |
| Oil and grease, hexane extr method | instantaneous maximum | ≤ 10 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, inorganic total | monthly average | ≤ 2.5 mg/L | all year | 003 |
| Nitrogen, inorganic total | instantaneous maximum | report only (mg/L) | all year | 003 |
| Nitrogen, inorganic total | monthly average | report only (lb/d) | all year | 003 |
| Nitrogen, inorganic total | annual average | ≤ 13.2 lb/d | all year | 003 |
| Iron, total recoverable | average | ≤ .25 mg/L | all year | 003 |
| Iron, total recoverable | instantaneous maximum | ≤ .38 mg/L | all year | 003 |
| Iron, total recoverable | monthly average | report only (lb/d) | all year | 003 |
| Iron, total recoverable | annual average | ≤ 1.32 lb/d | all year | 003 |
| Zinc, total recoverable | average | ≤ .1 mg/L | all year | 003 |
| Zinc, total recoverable | instantaneous maximum | ≤ .15 mg/L | all year | 003 |
| Zinc, total recoverable | monthly average | report only (lb/d) | all year | 003 |
| Zinc, total recoverable | annual average | ≤ .342 lb/d | all year | 003 |
| Cadmium, total recoverable | average | ≤ .0008 mg/L | all year | 003 |
| Cadmium, total recoverable | instantaneous maximum | ≤ .0012 mg/L | all year | 003 |
| Cadmium, total recoverable | monthly average | report only (lb/d) | all year | 003 |
| Cadmium, total recoverable | annual average | ≤ .0042 lb/d | all year | 003 |
| Lead, total recoverable | average | ≤ .003 mg/L | all year | 003 |
| Lead, total recoverable | instantaneous maximum | ≤ .003 mg/L | all year | 003 |
| Lead, total recoverable | monthly average | report only (lb/d) | all year | 003 |
| Lead, total recoverable | annual average | ≤ .004 lb/d | all year | 003 |
| Chromium, total recoverable | average | ≤ .13 mg/L | all year | 003 |
| Chromium, total recoverable | instantaneous maximum | ≤ .02 mg/L | all year | 003 |
| Chromium, total recoverable | monthly average | report only (lb/d) | all year | 003 |
| Chromium, total recoverable | annual average | ≤ .066 lb/d | all year | 003 |
| Copper, total recoverable | average | ≤ .007 mg/L | all year | 003 |
| Copper, total recoverable | instantaneous maximum | ≤ .01 mg/L | all year | 003 |
| Copper, total recoverable | monthly average | report only (lb/d) | all year | 003 |
| Copper, total recoverable | annual average | ≤ .036 lb/d | all year | 003 |
| Manganese, total recoverable | average | ≤ .11 mg/L | all year | 003 |
| Manganese, total recoverable | instantaneous maximum | ≤ .15 mg/L | all year | 003 |
| Manganese, total recoverable | monthly average | report only (lb/d) | all year | 003 |
| Manganese, total recoverable | annual average | ≤ .54 lb/d | all year | 003 |
| Mercury, total recoverable | average | ≤ .0006 mg/L | all year | 003 |
| Mercury, total recoverable | instantaneous maximum | ≤ .0006 mg/L | all year | 003 |
| Mercury, total recoverable | monthly average | report only (lb/d) | all year | 003 |
| Mercury, total recoverable | annual average | report only (lb/d) | all year | 003 |
| Sulfate | average | report only (mg/L) | all year | 003 |
| Sulfate | instantaneous maximum | report only (mg/L) | all year | 003 |
| Oil and grease visual | value | report only (Y=0;N=1) | all year | 003 |
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/MT0030279 · MCP: https://passage-data.com/mcp