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Ferroalloy Ores, Except Vanadium, major discharger, Challis, Idaho. NPDES permit ID0025402 expired Jan 29, 2007; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| 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 |
| pH | minimum | ≥ 6.5 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 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | monthly average | ≤ 41 ug/L | all year | 001 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, total recoverable | daily maximum | ≤ 56 ug/L | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 750 ug/L | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 1500 ug/L | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 160 ug/L | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 230 ug/L | all year | 001 |
| Cadmium, total recoverable | monthly average | ≤ 56 ug/L | all year | 001 |
| Cadmium, total recoverable | daily maximum | ≤ 81 ug/L | all year | 001 |
| Cadmium, total recoverable | monthly average | ≤ 1.4 ug/L | all year | 001 |
| Cadmium, total recoverable | daily maximum | ≤ 2 ug/L | all year | 001 |
| Lead, total recoverable | monthly average | ≤ 73 ug/L | all year | 001 |
| Lead, total recoverable | daily maximum | ≤ 110 ug/L | all year | 001 |
| Lead, total recoverable | monthly average | ≤ 5.4 ug/L | all year | 001 |
| Lead, total recoverable | daily maximum | ≤ 7.9 ug/L | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 150 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 300 ug/L | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 20 ug/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 30 ug/L | all year | 001 |
| Molybdenum, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily average | report only (cfs) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (cfs) | all year | 001 |
| Toxicity, final conc toxicity units | monthly average | report only (toxic) | Apr | 001 |
| Toxicity, final conc toxicity units | daily maximum | report only (toxic) | Apr | 001 |
| Mercury, total [as Hg] | monthly average | ≤ .73 ug/L | all year | 001 |
| Mercury, total [as Hg] | daily maximum | ≤ 1.1 ug/L | all year | 001 |
| Mercury, total [as Hg] | monthly average | ≤ .069 ug/L | all year | 001 |
| Mercury, total [as Hg] | daily maximum | ≤ .1 ug/L | all year | 001 |
| Flow | monthly average | report only (cfs) | all year | 001 |
| Flow | daily maximum | report only (cfs) | all year | 001 |
| Effluent dilution ratio | daily minimum | ≥ 212 % | all year | 001 |
| Effluent dilution ratio | daily minimum | ≥ 16.2 % | all year | 001 |
| TU Static Renewal 96Hr Acute Oncorhynchus Mykiss | monthly average | report only (tox acute) | Apr | 001 |
| TU Static Renewal 96Hr Acute Oncorhynchus Mykiss | daily maximum | report only (tox acute) | Apr | 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 |
| pH | minimum | ≥ 6.5 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 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 002 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 002 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Selenium, total recoverable | monthly average | ≤ 27 ug/L | all year | 002 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Selenium, total recoverable | daily maximum | ≤ 40 ug/L | all year | 002 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Selenium, total recoverable | monthly average | ≤ 11 ug/L | all year | 002 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Selenium, total recoverable | daily maximum | ≤ 16 ug/L | all year | 002 |
| Zinc, total recoverable | monthly average | ≤ 190 ug/L | all year | 002 |
| Zinc, total recoverable | daily maximum | ≤ 280 ug/L | all year | 002 |
| Zinc, total recoverable | monthly average | ≤ 300 ug/L | all year | 002 |
| Zinc, total recoverable | daily maximum | ≤ 440 ug/L | all year | 002 |
| Cadmium, total recoverable | monthly average | ≤ 8.5 ug/L | all year | 002 |
| Cadmium, total recoverable | daily maximum | ≤ 12 ug/L | all year | 002 |
| Cadmium, total recoverable | monthly average | ≤ 5.5 ug/L | all year | 002 |
| Cadmium, total recoverable | daily maximum | ≤ 8.1 ug/L | all year | 002 |
| Lead, total recoverable | monthly average | ≤ 23 ug/L | all year | 002 |
| Lead, total recoverable | daily maximum | ≤ 33 ug/L | all year | 002 |
| Lead, total recoverable | monthly average | ≤ 13 ug/L | all year | 002 |
| Lead, total recoverable | daily maximum | ≤ 18 ug/L | all year | 002 |
| Copper, total recoverable | monthly average | ≤ 22 ug/L | all year | 002 |
| Copper, total recoverable | daily maximum | ≤ 32 ug/L | all year | 002 |
| Copper, total recoverable | monthly average | ≤ 26 ug/L | all year | 002 |
| Copper, total recoverable | daily maximum | ≤ 38 ug/L | all year | 002 |
| Molybdenum, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily average | report only (cfs) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (cfs) | all year | 002 |
| Toxicity, final conc toxicity units | monthly average | report only (toxic) | Apr | 002 |
| Toxicity, final conc toxicity units | daily maximum | report only (toxic) | Apr | 002 |
| Mercury, total [as Hg] | monthly average | ≤ .057 ug/L | all year | 002 |
| Mercury, total [as Hg] | daily maximum | ≤ .083 ug/L | all year | 002 |
| Mercury, total [as Hg] | monthly average | ≤ .057 ug/L | all year | 002 |
| Mercury, total [as Hg] | daily maximum | ≤ .083 ug/L | all year | 002 |
| Flow | monthly average | report only (MGD) | all year | 002 |
| Flow | daily maximum | report only (MGD) | all year | 002 |
| Effluent dilution ratio | daily minimum | ≥ 12.5 % | all year | 002 |
| Effluent dilution ratio | daily minimum | ≥ 8 % | all year | 002 |
| TU Static Renewal 96Hr Acute Oncorhynchus Mykiss | monthly average | report only (tox acute) | Apr | 002 |
| TU Static Renewal 96Hr Acute Oncorhynchus Mykiss | daily maximum | report only (tox acute) | Apr | 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 |
| Turbidity | monthly average | report only (NTU) | Feb–Jun | 003 |
| Turbidity | monthly average | report only (NTU) | Jan, Jul, Aug, Sep, Oct, Nov, Dec | 003 |
| Turbidity | daily maximum | report only (NTU) | Feb–Jun | 003 |
| Turbidity | daily maximum | report only (NTU) | Jan, Jul, Aug, Sep, Oct, Nov, Dec | 003 |
| pH | minimum | report only (SU) | all year | 003 |
| pH | maximum | report only (SU) | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 003 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 003 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Mercury, total [as Hg] | monthly average | report only (ug/L) | all year | 003 |
| Mercury, total [as Hg] | daily maximum | report only (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 |
| pH | minimum | ≥ 6.5 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 004 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 004 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 004 |
| Silver total recoverable | monthly average | report only (ug/L) | all year | 004 |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Zinc, total recoverable | monthly average | ≤ 260 ug/L | all year | 004 |
| Zinc, total recoverable | daily maximum | ≤ 510 ug/L | all year | 004 |
| Zinc, total recoverable | monthly average | ≤ 1.8 lb/d | all year | 004 |
| Zinc, total recoverable | daily maximum | ≤ 3.6 lb/d | all year | 004 |
| Zinc, total recoverable | monthly average | ≤ 350 ug/L | all year | 004 |
| Zinc, total recoverable | daily maximum | ≤ 700 ug/L | all year | 004 |
| Zinc, total recoverable | monthly average | ≤ 2.4 lb/d | all year | 004 |
| Zinc, total recoverable | daily maximum | ≤ 4.9 lb/d | all year | 004 |
| Cadmium, total recoverable | monthly average | ≤ 5.8 ug/L | all year | 004 |
| Cadmium, total recoverable | daily maximum | ≤ 12 ug/L | all year | 004 |
| Cadmium, total recoverable | monthly average | ≤ .041 lb/d | all year | 004 |
| Cadmium, total recoverable | daily maximum | ≤ .084 lb/d | all year | 004 |
| Cadmium, total recoverable | monthly average | ≤ 13 ug/L | all year | 004 |
| Cadmium, total recoverable | daily maximum | ≤ 26 ug/L | all year | 004 |
| Cadmium, total recoverable | monthly average | ≤ .091 lb/d | all year | 004 |
| Cadmium, total recoverable | daily maximum | ≤ .18 lb/d | all year | 004 |
| Lead, total recoverable | monthly average | ≤ 26 ug/L | all year | 004 |
| Lead, total recoverable | daily maximum | ≤ 53 ug/L | all year | 004 |
| Lead, total recoverable | monthly average | ≤ .18 lb/d | all year | 004 |
| Lead, total recoverable | daily maximum | ≤ .37 lb/d | all year | 004 |
| Lead, total recoverable | monthly average | ≤ 19 ug/L | all year | 004 |
| Lead, total recoverable | daily maximum | ≤ 38 ug/L | all year | 004 |
| Lead, total recoverable | monthly average | ≤ .13 lb/d | all year | 004 |
| Lead, total recoverable | daily maximum | ≤ .27 lb/d | 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 | ≤ 24 ug/L | all year | 004 |
| Copper, total recoverable | daily maximum | ≤ 48 ug/L | all year | 004 |
| Copper, total recoverable | monthly average | ≤ .17 lb/d | all year | 004 |
| Copper, total recoverable | daily maximum | ≤ .34 lb/d | all year | 004 |
| Copper, total recoverable | monthly average | ≤ 37 ug/L | all year | 004 |
| Copper, total recoverable | daily maximum | ≤ 75 ug/L | all year | 004 |
| Copper, total recoverable | monthly average | ≤ .26 lb/d | all year | 004 |
| Copper, total recoverable | daily maximum | ≤ .52 lb/d | all year | 004 |
| Molybdenum, total recoverable | monthly average | report only (ug/L) | all year | 004 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (cfs) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (cfs) | all year | 004 |
| Toxicity, final conc toxicity units | monthly average | report only (toxic) | Apr, Jun, Aug, Oct | 004 |
| Toxicity, final conc toxicity units | daily maximum | report only (toxic) | Apr, Jun, Aug, Oct | 004 |
| Mercury, total [as Hg] | monthly average | ≤ .044 ug/L | all year | 004 |
| Mercury, total [as Hg] | daily maximum | ≤ .89 ug/L | all year | 004 |
| Mercury, total [as Hg] | monthly average | ≤ .00031 lb/d | all year | 004 |
| Mercury, total [as Hg] | daily maximum | ≤ .00069 lb/d | all year | 004 |
| Mercury, total [as Hg] | monthly average | ≤ .1 ug/L | all year | 004 |
| Mercury, total [as Hg] | daily maximum | ≤ .21 ug/L | all year | 004 |
| Mercury, total [as Hg] | monthly average | ≤ .0007 lb/d | all year | 004 |
| Mercury, total [as Hg] | daily maximum | ≤ .0015 lb/d | all year | 004 |
| Flow | monthly average | report only (cfs) | all year | 004 |
| Flow | daily maximum | report only (cfs) | all year | 004 |
| TU Static Renewal 96Hr Acute Oncorhynchus Mykiss | monthly average | report only (tox acute) | Apr | 004 |
| TU Static Renewal 96Hr Acute Oncorhynchus Mykiss | daily maximum | report only (tox acute) | Apr | 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 |
| pH | minimum | ≥ 6.5 SU | all year | 005 |
| pH | maximum | ≤ 9 SU | all year | 005 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 005 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 005 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 005 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 005 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 005 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Silver total recoverable | monthly average | report only (ug/L) | all year | 005 |
| Silver total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Zinc, total recoverable | monthly average | ≤ 500 ug/L | all year | 005 |
| Zinc, total recoverable | daily maximum | ≤ 1000 ug/L | all year | 005 |
| Zinc, total recoverable | monthly average | ≤ 500 ug/L | all year | 005 |
| Zinc, total recoverable | daily maximum | ≤ 1000 ug/L | all year | 005 |
| Cadmium, total recoverable | monthly average | ≤ 6.2 ug/L | all year | 005 |
| Cadmium, total recoverable | daily maximum | ≤ 12 ug/L | all year | 005 |
| Cadmium, total recoverable | monthly average | ≤ 15 ug/L | all year | 005 |
| Cadmium, total recoverable | daily maximum | ≤ 31 ug/L | all year | 005 |
| Lead, total recoverable | monthly average | ≤ 10 ug/L | all year | 005 |
| Lead, total recoverable | daily maximum | ≤ 21 ug/L | all year | 005 |
| Lead, total recoverable | monthly average | ≤ 25 ug/L | all year | 005 |
| Lead, total recoverable | daily maximum | ≤ 50 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 | ≤ 59 ug/L | all year | 005 |
| Copper, total recoverable | daily maximum | ≤ 120 ug/L | all year | 005 |
| Copper, total recoverable | monthly average | ≤ 160 ug/L | all year | 005 |
| Copper, total recoverable | daily maximum | ≤ 320 ug/L | all year | 005 |
| Molybdenum, total recoverable | monthly average | report only (ug/L) | all year | 005 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily average | report only (cfs) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (cfs) | all year | 005 |
| Toxicity, final conc toxicity units | monthly average | report only (toxic) | Apr, Jun, Aug, Oct | 005 |
| Toxicity, final conc toxicity units | daily maximum | report only (toxic) | Apr, Jun, Aug, Oct | 005 |
| Mercury, total [as Hg] | monthly average | ≤ .3 ug/L | all year | 005 |
| Mercury, total [as Hg] | daily maximum | ≤ .61 ug/L | all year | 005 |
| Mercury, total [as Hg] | monthly average | ≤ .2 ug/L | all year | 005 |
| Mercury, total [as Hg] | daily maximum | ≤ .36 ug/L | all year | 005 |
| Flow | monthly average | report only (cfs) | all year | 005 |
| Flow | daily minimum | report only (cfs) | all year | 005 |
| Effluent dilution ratio | daily minimum | ≥ 120 % | Aug | 005 |
| Effluent dilution ratio | daily minimum | ≥ 303 % | all year | 005 |
| TU Static Renewal 96Hr Acute Oncorhynchus Mykiss | monthly average | report only (tox acute) | Apr | 005 |
| TU Static Renewal 96Hr Acute Oncorhynchus Mykiss | daily maximum | report only (tox acute) | Apr | 005 |
Cited limits by parameter: Idaho's rules and the federal ones.
Same industry: the 10 Metal Mining permits in Idaho.
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Your permit document is the final word. As JSON: /api/v1/permits/ID0025402 · MCP: https://passage-data.com/mcp