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Gold Ores, major discharger, Butte, Montana. NPDES permit MT0031755 expired Jul 31, 2018; its limits still apply. Last 12 months: over a limit 2 times (last July 2026), 30 of 94 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Arsenic, total recoverable, daily maximum | 12 ug/L | ≤ 10 ug/L | 20% |
| July 2026 | pH, instantaneous maximum | 8.31 SU | ≤ 8.3 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Flow rate | monthly average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| pH | instantaneous minimum | ≥ 7.6 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 8.3 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 3 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 6.1 mg/L | all year | 001 |
| Oil and grease, hexane extr method | single grab sample | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | ≤ .18 mg/L | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .07 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ .07 mg/L | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | ≤ .11 mg/L | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ .23 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ .012 mg/L | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 001 |
| Hardness, total [as CaCO3] | single grab sample | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | single grab sample | report only (mg/L) | all year | 001 |
| Fluoride, total [as F] | monthly average | ≤ 200 ug/L | all year | 001 |
| Fluoride, total [as F] | daily maximum | ≤ 200 ug/L | all year | 001 |
| Arsenic, total recoverable | monthly average | ≤ 5 ug/L | all year | 001 |
| Arsenic, total recoverable | daily maximum | ≤ 10 ug/L | all year | 001 |
| Selenium, total recoverable | monthly average | ≤ 1 ug/L | all year | 001 |
| Selenium, total recoverable | daily maximum | ≤ 1 ug/L | all year | 001 |
| Nickel, total recoverable | monthly average | ≤ 2 ug/L | all year | 001 |
| Nickel, total recoverable | daily maximum | ≤ 2 ug/L | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 8 ug/L | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 8 ug/L | all year | 001 |
| Cadmium, total recoverable | monthly average | ≤ .03 ug/L | all year | 001 |
| Cadmium, total recoverable | daily maximum | ≤ .05 ug/L | all year | 001 |
| Lead, total recoverable | monthly average | ≤ .3 ug/L | all year | 001 |
| Lead, total recoverable | daily maximum | ≤ .3 ug/L | all year | 001 |
| Chromium, total recoverable | monthly average | ≤ 10 ug/L | all year | 001 |
| Chromium, total recoverable | daily maximum | ≤ 10 ug/L | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 2 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 2.1 ug/L | all year | 001 |
| Mercury, total recoverable | monthly average | ≤ .006 ug/L | all year | 001 |
| Mercury, total recoverable | daily maximum | ≤ .012 ug/L | all year | 001 |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | value | ≤ 0 pass=0;fail=1 | all year | 001 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | value | ≤ 0 pass=0;fail=1 | all year | 001 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 002 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 002 |
| Flow rate | monthly average | report only (MGD) | all year | 002 |
| Flow rate | daily maximum | report only (MGD) | all year | 002 |
| pH | instantaneous minimum | ≥ 7 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ .4 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ .9 mg/L | all year | 002 |
| Oil and grease, hexane extr method | single grab sample | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | ≤ .08 mg/L | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | daily 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] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | ≤ .02 mg/L | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 002 |
| Hardness, total [as CaCO3] | single grab sample | report only (mg/L) | all year | 002 |
| Sulfate, total [as SO4] | single grab sample | report only (mg/L) | all year | 002 |
| Fluoride, total [as F] | monthly average | report only (ug/L) | all year | 002 |
| Fluoride, total [as F] | daily maximum | report only (ug/L) | all year | 002 |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Selenium, total recoverable | monthly average | ≤ 1 ug/L | all year | 002 |
| Selenium, total recoverable | daily maximum | ≤ 1.23 ug/L | all year | 002 |
| Nickel, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | monthly average | ≤ 8 ug/L | all year | 002 |
| Zinc, total recoverable | daily maximum | ≤ 9.2 ug/L | all year | 002 |
| Cadmium, total recoverable | monthly average | ≤ .03 ug/L | all year | 002 |
| Cadmium, total recoverable | daily maximum | ≤ .03 ug/L | all year | 002 |
| Lead, total recoverable | monthly average | ≤ .3 ug/L | all year | 002 |
| Lead, total recoverable | daily maximum | ≤ .3 ug/L | all year | 002 |
| Chromium, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Copper, total recoverable | monthly average | ≤ 2 ug/L | all year | 002 |
| Copper, total recoverable | daily maximum | ≤ 2 ug/L | all year | 002 |
| Mercury, total recoverable | monthly average | ≤ .006 ug/L | all year | 002 |
| Mercury, total recoverable | daily maximum | ≤ .012 ug/L | all year | 002 |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | value | ≤ 0 pass=0;fail=1 | all year | 002 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | value | ≤ 0 pass=0;fail=1 | all year | 002 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 003 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 003 |
| Flow rate | monthly average | report only (MGD) | all year | 003 |
| Flow rate | daily maximum | report only (MGD) | all year | 003 |
| pH | instantaneous minimum | ≥ 7 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 1 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 2 mg/L | all year | 003 |
| Oil and grease, hexane extr method | single grab sample | report only (mg/L) | all year | 003 |
| Nitrogen, total [as N] | monthly average | ≤ .27 mg/L | all year | 003 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 003 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | daily 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] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | monthly average | ≤ .008 mg/L | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 003 |
| Hardness, total [as CaCO3] | single grab sample | report only (mg/L) | all year | 003 |
| Sulfate, total [as SO4] | single grab sample | report only (mg/L) | all year | 003 |
| Fluoride, total [as F] | monthly average | report only (ug/L) | all year | 003 |
| Fluoride, total [as F] | daily maximum | report only (ug/L) | all year | 003 |
| Arsenic, total recoverable | monthly average | ≤ 2 ug/L | all year | 003 |
| Arsenic, total recoverable | daily maximum | ≤ 3.9 ug/L | all year | 003 |
| Selenium, total recoverable | monthly average | ≤ 1 ug/L | all year | 003 |
| Selenium, total recoverable | daily maximum | ≤ 1.23 ug/L | all year | 003 |
| Nickel, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Zinc, total recoverable | monthly average | ≤ 27.6 ug/L | all year | 003 |
| Zinc, total recoverable | daily maximum | ≤ 55.5 ug/L | all year | 003 |
| Cadmium, total recoverable | monthly average | ≤ .06 ug/L | all year | 003 |
| Cadmium, total recoverable | daily maximum | ≤ .11 ug/L | all year | 003 |
| Lead, total recoverable | monthly average | ≤ 1 ug/L | all year | 003 |
| Lead, total recoverable | daily maximum | ≤ 2 ug/L | all year | 003 |
| Chromium, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Copper, total recoverable | monthly average | ≤ 2.1 ug/L | all year | 003 |
| Copper, total recoverable | daily maximum | ≤ 4.3 ug/L | all year | 003 |
| Mercury, total recoverable | monthly average | ≤ .006 ug/L | all year | 003 |
| Mercury, total recoverable | daily maximum | ≤ .012 ug/L | all year | 003 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 004 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 004 |
| Flow rate | monthly average | report only (MGD) | all year | 004 |
| Flow rate | daily maximum | report only (MGD) | all year | 004 |
| pH | instantaneous minimum | ≥ 7 SU | all year | 004 |
| pH | instantaneous maximum | ≤ 8.5 SU | all year | 004 |
| Solids, total suspended | monthly average | ≤ 1.5 mg/L | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 3 mg/L | all year | 004 |
| Oil and grease, hexane extr method | single grab sample | report only (mg/L) | all year | 004 |
| Nitrogen, total [as N] | monthly average | ≤ .14 mg/L | all year | 004 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 004 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 004 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 004 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 004 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Phosphorus, total [as P] | monthly average | ≤ .012 mg/L | all year | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 004 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 004 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 004 |
| Hardness, total [as CaCO3] | single grab sample | report only (mg/L) | all year | 004 |
| Sulfate, total [as SO4] | single grab sample | report only (mg/L) | all year | 004 |
| Fluoride, total [as F] | monthly average | report only (ug/L) | all year | 004 |
| Fluoride, total [as F] | daily maximum | report only (ug/L) | all year | 004 |
| Arsenic, total recoverable | monthly average | ≤ 3 ug/L | all year | 004 |
| Arsenic, total recoverable | daily maximum | ≤ 6.1 ug/L | all year | 004 |
| Selenium, total recoverable | monthly average | ≤ 1 ug/L | all year | 004 |
| Selenium, total recoverable | daily maximum | ≤ 1.23 ug/L | all year | 004 |
| Nickel, total recoverable | monthly average | report only (ug/L) | all year | 004 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Zinc, total recoverable | monthly average | ≤ 14.7 ug/L | all year | 004 |
| Zinc, total recoverable | daily maximum | ≤ 29.5 ug/L | all year | 004 |
| Cadmium, total recoverable | monthly average | ≤ .04 ug/L | all year | 004 |
| Cadmium, total recoverable | daily maximum | ≤ .08 ug/L | all year | 004 |
| Lead, total recoverable | monthly average | ≤ .5 ug/L | all year | 004 |
| Lead, total recoverable | daily maximum | ≤ 1 ug/L | all year | 004 |
| Chromium, total recoverable | monthly average | report only (ug/L) | all year | 004 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Copper, total recoverable | monthly average | ≤ 2 ug/L | all year | 004 |
| Copper, total recoverable | daily maximum | ≤ 2.8 ug/L | all year | 004 |
| Mercury, total recoverable | monthly average | ≤ .006 ug/L | all year | 004 |
| Mercury, total recoverable | daily maximum | ≤ .012 ug/L | all year | 004 |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | value | ≤ 0 pass=0;fail=1 | all year | 004 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | value | ≤ 0 pass=0;fail=1 | all year | 004 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 005 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 005 |
| Flow rate | monthly average | report only (MGD) | all year | 005 |
| Flow rate | daily maximum | report only (MGD) | all year | 005 |
| pH | monthly average | ≤ 7 SU | all year | 005 |
| pH | daily maximum | ≤ 8.5 SU | all year | 005 |
| Solids, total suspended | monthly average | ≤ 1 mg/L | all year | 005 |
| Solids, total suspended | daily maximum | ≤ 2 mg/L | all year | 005 |
| Oil and grease, hexane extr method | single grab sample | report only (mg/L) | all year | 005 |
| Nitrogen, total [as N] | monthly average | ≤ .27 mg/L | all year | 005 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 005 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 005 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 005 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 005 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Phosphorus, total [as P] | monthly average | ≤ .008 mg/L | all year | 005 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 005 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 005 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 005 |
| Hardness, total [as CaCO3] | single grab sample | report only (mg/L) | all year | 005 |
| Sulfate, total [as SO4] | single grab sample | report only (mg/L) | all year | 005 |
| Fluoride, total [as F] | monthly average | report only (ug/L) | all year | 005 |
| Fluoride, total [as F] | daily maximum | report only (ug/L) | all year | 005 |
| Arsenic, total recoverable | monthly average | ≤ 2 ug/L | all year | 005 |
| Arsenic, total recoverable | daily maximum | ≤ 3.9 ug/L | all year | 005 |
| Selenium, total recoverable | monthly average | ≤ 1 ug/L | all year | 005 |
| Selenium, total recoverable | daily maximum | ≤ 1.23 ug/L | all year | 005 |
| Nickel, total recoverable | monthly average | report only (ug/L) | all year | 005 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Zinc, total recoverable | monthly average | ≤ 27.6 ug/L | all year | 005 |
| Zinc, total recoverable | daily maximum | ≤ 55.5 ug/L | all year | 005 |
| Cadmium, total recoverable | monthly average | ≤ .06 ug/L | all year | 005 |
| Cadmium, total recoverable | daily maximum | ≤ .11 ug/L | all year | 005 |
| Lead, total recoverable | monthly average | ≤ 1 ug/L | all year | 005 |
| Lead, total recoverable | daily maximum | ≤ 2 ug/L | all year | 005 |
| Chromium, total recoverable | monthly average | report only (ug/L) | all year | 005 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Copper, total recoverable | monthly average | ≤ 2.1 ug/L | all year | 005 |
| Copper, total recoverable | daily maximum | ≤ 4.3 ug/L | all year | 005 |
| Mercury, total recoverable | monthly average | ≤ .006 ug/L | all year | 005 |
| Mercury, total recoverable | daily maximum | ≤ .012 ug/L | all year | 005 |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | value | ≤ 0 pass=0;fail=1 | all year | 005 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | value | ≤ 0 pass=0;fail=1 | all year | 005 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 006 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 006 |
| Flow rate | monthly average | report only (MGD) | all year | 006 |
| Flow rate | daily maximum | report only (MGD) | all year | 006 |
| pH | monthly average | ≤ 7 SU | all year | 006 |
| pH | daily maximum | ≤ 8.5 SU | all year | 006 |
| Solids, total suspended | monthly average | ≤ 1 mg/L | all year | 006 |
| Solids, total suspended | daily maximum | ≤ 2 mg/L | all year | 006 |
| Oil and grease, hexane extr method | single grab sample | report only (mg/L) | all year | 006 |
| Nitrogen, total [as N] | monthly average | ≤ .27 mg/L | all year | 006 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year | 006 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 006 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 006 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 006 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 006 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Phosphorus, total [as P] | monthly average | ≤ .008 mg/L | all year | 006 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 006 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 006 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 006 |
| Hardness, total [as CaCO3] | single grab sample | report only (mg/L) | all year | 006 |
| Sulfate, total [as SO4] | single grab sample | report only (mg/L) | all year | 006 |
| Fluoride, total [as F] | monthly average | report only (ug/L) | all year | 006 |
| Fluoride, total [as F] | daily maximum | report only (ug/L) | all year | 006 |
| Arsenic, total recoverable | monthly average | ≤ 2 ug/L | all year | 006 |
| Arsenic, total recoverable | daily maximum | ≤ 3.9 ug/L | all year | 006 |
| Selenium, total recoverable | monthly average | ≤ 1 ug/L | all year | 006 |
| Selenium, total recoverable | daily maximum | ≤ 1.23 ug/L | all year | 006 |
| Nickel, total recoverable | monthly average | report only (ug/L) | all year | 006 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Zinc, total recoverable | monthly average | ≤ 27.6 ug/L | all year | 006 |
| Zinc, total recoverable | daily maximum | ≤ 55.5 ug/L | all year | 006 |
| Cadmium, total recoverable | monthly average | ≤ .06 ug/L | all year | 006 |
| Cadmium, total recoverable | daily maximum | ≤ .11 ug/L | all year | 006 |
| Lead, total recoverable | monthly average | ≤ 1 ug/L | all year | 006 |
| Lead, total recoverable | daily maximum | ≤ 2 ug/L | all year | 006 |
| Chromium, total recoverable | monthly average | report only (ug/L) | all year | 006 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Copper, total recoverable | monthly average | ≤ 2.1 ug/L | all year | 006 |
| Copper, total recoverable | daily maximum | ≤ 4.3 ug/L | all year | 006 |
| Mercury, total recoverable | monthly average | ≤ .006 ug/L | all year | 006 |
| Mercury, total recoverable | daily maximum | ≤ .012 ug/L | all year | 006 |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | value | ≤ 0 pass=0;fail=1 | all year | 006 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | value | ≤ 0 pass=0;fail=1 | all year | 006 |
Cited limits by parameter: Montana's rules and the federal ones.
Same industry: the 7 Metal Mining permits in Montana.
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Your permit document is the final word. As JSON: /api/v1/permits/MT0031755 · MCP: https://passage-data.com/mcp