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Gold Ores, major discharger, Juneau, Alaska. NPDES permit AK0050571, in force until Jul 31, 2029. Last 12 months: over a limit once (last December 2025), 3 of 33 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 7.23 mg/L | ≤ 5.8 mg/L | 25% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | 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, ammonia total [as N] | monthly average | ≤ 3.2 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.8 mg/L | all year | 001 |
| Nitrogen, nitrate total [as N] | monthly average | ≤ 10 mg/L | all year | 001 |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 14 mg/L | all year | 001 |
| Iron, total recoverable | monthly average | ≤ .73 mg/L | all year | 001 |
| Iron, total recoverable | daily maximum | ≤ 1.8 mg/L | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 54 ug/L | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 88 ug/L | all year | 001 |
| Aluminum, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | monthly average | ≤ .2 ug/L | all year | 001 |
| Cadmium, total recoverable | daily maximum | ≤ .24 ug/L | all year | 001 |
| Lead, total recoverable | monthly average | ≤ 1.9 ug/L | all year | 001 |
| Lead, total recoverable | daily maximum | ≤ 2.5 ug/L | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 3.9 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 9.9 ug/L | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 4500 gal/min | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 4500 gal/min | all year | 001 |
| Toxicity, final conc toxicity units | monthly average | ≤ 1.1 tox chronic | all year | 001 |
| Toxicity, final conc toxicity units | daily maximum | ≤ 1.6 tox chronic | all year | 001 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Mercury, total [as Hg] | monthly average | ≤ .01 ug/L | all year | 001 |
| Mercury, total [as Hg] | daily maximum | ≤ .02 ug/L | all year | 001 |
| Sulfate | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate | monthly average | report only (mg/L) | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 002 |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, nitrate total [as N] | daily maximum | ≤ 14 mg/L | all year | 002 |
| Iron, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | monthly average | ≤ 63 ug/L | all year | 002 |
| Zinc, total recoverable | daily maximum | ≤ 93 ug/L | all year | 002 |
| Cadmium, total recoverable | monthly average | ≤ .19 ug/L | all year | 002 |
| Cadmium, total recoverable | daily maximum | ≤ .3 ug/L | all year | 002 |
| Lead, total recoverable | monthly average | ≤ 2 ug/L | all year | 002 |
| Lead, total recoverable | daily maximum | ≤ 2.8 ug/L | all year | 002 |
| Copper, total recoverable | monthly average | ≤ 5.8 ug/L | all year | 002 |
| Copper, total recoverable | daily maximum | ≤ 11 ug/L | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 2000 gal/min | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 2000 gal/min | all year | 002 |
| Nitrogen, Ammonia Total | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, Ammonia Total | daily maximum | ≤ 4.6 mg/L | all year | 002 |
| Toxicity, final conc toxicity units | monthly average | ≤ 1.1 tox chronic | all year | 002 |
| Toxicity, final conc toxicity units | daily maximum | ≤ 1.6 tox chronic | all year | 002 |
| Solids, total dissolved | monthly average | ≤ 500 mg/L | all year | 002 |
| Solids, total dissolved | daily maximum | ≤ 587 mg/L | all year | 002 |
| Mercury, total recoverable | monthly average | ≤ .01 ug/L | all year | 002 |
| Mercury, total recoverable | daily maximum | ≤ .02 ug/L | all year | 002 |
| Sulfate | monthly average | report only (mg/L) | all year | 002 |
| Sulfate | daily maximum | report only (mg/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 4000 gal/min | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ 4000 gal/min | all year | 003 |
| Sulfate | monthly average | ≤ 250 mg/L | all year | 003 |
| Sulfate | daily maximum | ≤ 500 mg/L | all year | 003 |
Cited limits by parameter: Alaska's rules and the federal ones.
Same industry: the 7 Metal Mining permits in Alaska.
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