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Gold Ores, major discharger, Helena, Montana. NPDES permit MT0025020 expired Apr 30, 2023; its limits still apply. Last 12 months: no values over a limit, 13 of 29 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Flow rate | monthly average | report only (gal/min) | all year | 001 |
| Flow rate | monthly maximum | report only (gal/min) | all year | 001 |
| Turbidity | monthly maximum | ≤ 5 NTU | all year | 001 |
| Turbidity | daily maximum | report only (NTU) | all year | 001 |
| Turbidity | daily maximum | report only (NTU) | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Oil and grease visual | value | report only (N=0;Y=1) | all year | 001 |
| Raw materials processed | daily maximum | report only (ton/d) | all year | 001 |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | value | report only (pass=0;fail=1) | all year | 001 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | value | report only (pass=0;fail=1) | all year | 001 |
| Flow rate | average | report only (gal/min) | all year | 002 |
| Flow rate | monthly maximum | report only (gal/min) | all year | 002 |
| Turbidity | daily maximum | ≤ 5 NTU | all year | 002 |
| Turbidity | daily maximum | report only (NTU) | all year | 002 |
| Turbidity | daily maximum | report only (NTU) | all year | 002 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 002 |
| Oil and grease visual | value | report only (N=0;Y=1) | all year | 002 |
| Raw materials processed | daily maximum | report only (ton/d) | all year | 002 |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | value | report only (pass=0;fail=1) | all year | 002 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | value | report only (pass=0;fail=1) | all year | 002 |
| Raw materials processed | annual maximum | ≤ 70000 ton/yr | all year | SUM |
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/MT0025020 · MCP: https://passage-data.com/mcp