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Ferroalloy Ores, Except Vanadium, major discharger, Empire, Colorado. NPDES permit CO0041467 expired Oct 31, 2017; 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 | maximum weekly average | report only (deg C) | Jun, Jul | 006 |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | Aug, Sep | 006 |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Jun, Jul | 006 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Aug, Sep | 006 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| pH | minimum | ≥ 6.5 SU | Jun, Jul | 006 |
| pH | minimum | ≥ 6.5 SU | Aug, Sep | 006 |
| pH | minimum | ≥ 6.5 SU | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| pH | maximum | ≤ 9 SU | Jun, Jul | 006 |
| pH | maximum | ≤ 9 SU | Aug, Sep | 006 |
| pH | maximum | ≤ 9 SU | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Solids, total suspended | 30-day average | ≤ 20 mg/L | Jun, Jul | 006 |
| Solids, total suspended | 30-day average | ≤ 20 mg/L | Aug, Sep | 006 |
| Solids, total suspended | 30-day average | ≤ 20 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Solids, total suspended | maximum 7-day average | ≤ 30 mg/L | Jun, Jul | 006 |
| Solids, total suspended | maximum 7-day average | ≤ 30 mg/L | Aug, Sep | 006 |
| Solids, total suspended | maximum 7-day average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Cadmium, total [as Cd] | 30-day average | report only (ug/L) | Jun, Jul | 006 |
| Cadmium, total [as Cd] | 30-day average | report only (ug/L) | Aug, Sep | 006 |
| Cadmium, total [as Cd] | 30-day average | ≤ 50 ug/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Cadmium, total [as Cd] | daily maximum | ≤ 100 ug/L | Jun, Jul | 006 |
| Cadmium, total [as Cd] | daily maximum | ≤ 100 ug/L | Aug, Sep | 006 |
| Cadmium, total [as Cd] | daily maximum | ≤ 100 ug/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Lead, total [as Pb] | 30-day average | report only (ug/L) | Jun, Jul | 006 |
| Lead, total [as Pb] | 30-day average | ≤ 300 ug/L | Aug, Sep | 006 |
| Lead, total [as Pb] | 30-day average | ≤ 300 ug/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Lead, total [as Pb] | daily maximum | ≤ 600 ug/L | Jun, Jul | 006 |
| Lead, total [as Pb] | daily maximum | ≤ 600 ug/L | Aug, Sep | 006 |
| Lead, total [as Pb] | daily maximum | ≤ 600 ug/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Zinc, total [as Zn] | 30-day average | ≤ 750 ug/L | Jun, Jul | 006 |
| Zinc, total [as Zn] | 30-day average | report only (ug/L) | Aug, Sep | 006 |
| Zinc, total [as Zn] | 30-day average | ≤ 750 ug/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Zinc, total [as Zn] | daily maximum | ≤ 1500 ug/L | Jun, Jul | 006 |
| Zinc, total [as Zn] | daily maximum | ≤ 1500 ug/L | Aug, Sep | 006 |
| Zinc, total [as Zn] | daily maximum | ≤ 1500 ug/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Molybdenum, total recoverable | 30-day average | report only (ug/L) | Jun, Jul | 006 |
| Molybdenum, total recoverable | 30-day average | report only (ug/L) | Aug, Sep | 006 |
| Molybdenum, total recoverable | 30-day average | report only (ug/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | Jun, Jul | 006 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | Aug, Sep | 006 |
| Molybdenum, total recoverable | daily maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | Jun, Jul | 006 |
| Zinc, potentially dissolved | 30-day average | ≤ 234 ug/L | Aug, Sep | 006 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | Jun, Jul | 006 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | Aug, Sep | 006 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Silver, potentially dissolved | 30-day average | ≤ .04 ug/L | Jun, Jul | 006 |
| Silver, potentially dissolved | 30-day average | ≤ .12 ug/L | Aug, Sep | 006 |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | Jun, Jul | 006 |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | Aug, Sep | 006 |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Copper, potentially dissolved | 30-day average | ≤ 8.6 ug/L | Jun, Jul | 006 |
| Copper, potentially dissolved | 30-day average | ≤ 16 ug/L | Aug, Sep | 006 |
| Copper, potentially dissolved | 30-day average | ≤ 28 ug/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Copper, potentially dissolved | 30-day average | ≤ 23 ug/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Copper, potentially dissolved | 30-day average | ≤ 7.8 ug/L | Jun, Jul | 006 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | Aug, Sep | 006 |
| Copper, potentially dissolved | daily maximum | ≤ 13 ug/L | Jun, Jul | 006 |
| Copper, potentially dissolved | daily maximum | ≤ 25 ug/L | Aug, Sep | 006 |
| Copper, potentially dissolved | daily maximum | ≤ 44 ug/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Copper, potentially dissolved | daily maximum | ≤ 34 ug/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Copper, potentially dissolved | daily maximum | ≤ 12 ug/L | Jun, Jul | 006 |
| Copper, potentially dissolved | daily maximum | ≤ 23 ug/L | Aug, Sep | 006 |
| Cadmium, potentially dissolvd | 30-day average | ≤ 3.2 ug/L | Jun, Jul | 006 |
| Cadmium, potentially dissolvd | 30-day average | ≤ 4.7 ug/L | Aug, Sep | 006 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Cadmium, potentially dissolvd | 30-day average | ≤ .25 ug/L | Jun, Jul | 006 |
| Cadmium, potentially dissolvd | 30-day average | ≤ .58 ug/L | Aug, Sep | 006 |
| Cadmium, potentially dissolvd | daily maximum | ≤ 3.5 ug/L | Jun, Jul | 006 |
| Cadmium, potentially dissolvd | daily maximum | ≤ 7.1 ug/L | Aug, Sep | 006 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Jun, Jul | 006 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | Aug, Sep | 006 |
| Lead, potentially dissolvd | 30-day average | ≤ 2.6 ug/L | Jun, Jul | 006 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | Aug, Sep | 006 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Lead, potentially dissolvd | 30-day average | ≤ 2.1 ug/L | Jun, Jul | 006 |
| Lead, potentially dissolvd | daily maximum | ≤ 67 ug/L | Jun, Jul | 006 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | Aug, Sep | 006 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | Jun, Jul | 006 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | Jun, Jul | 006 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | Aug, Sep | 006 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | Jun, Jul | 006 |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | Aug, Sep | 006 |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | Jun, Jul | 006 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | Aug, Sep | 006 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 4.2 MGD | Jun, Jul | 006 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 3.5 MGD | Aug, Sep | 006 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 3.3 MGD | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Jun, Jul | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Aug, Sep | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Chlorine, total residual | 30-day average | report only (mg/L) | Jun, Jul | 006 |
| Chlorine, total residual | 30-day average | report only (mg/L) | Aug, Sep | 006 |
| Chlorine, total residual | 30-day average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Chlorine, total residual | 30-day average | ≤ .013 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Chlorine, total residual | 30-day average | ≤ .016 mg/L | Jun, Jul | 006 |
| Chlorine, total residual | 30-day average | ≤ .015 mg/L | Aug, Sep | 006 |
| Chlorine, total residual | daily maximum | report only (mg/L) | Jun, Jul | 006 |
| Chlorine, total residual | daily maximum | report only (mg/L) | Aug, Sep | 006 |
| Chlorine, total residual | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Chlorine, total residual | daily maximum | ≤ .022 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Chlorine, total residual | daily maximum | ≤ .027 mg/L | Jun, Jul | 006 |
| Chlorine, total residual | daily maximum | ≤ .025 mg/L | Aug, Sep | 006 |
| Mercury, total [as Hg] | 30-day average | ≤ 1 ug/L | Jun, Jul | 006 |
| Mercury, total [as Hg] | 30-day average | ≤ 1 ug/L | Aug, Sep | 006 |
| Mercury, total [as Hg] | 30-day average | ≤ 1 ug/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Mercury, total [as Hg] | daily maximum | ≤ 2 ug/L | Jun, Jul | 006 |
| Mercury, total [as Hg] | daily maximum | ≤ 2 ug/L | Aug, Sep | 006 |
| Mercury, total [as Hg] | daily maximum | ≤ 2 ug/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | Jun, Jul | 006 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | Aug, Sep | 006 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | single sample | report only (tox chronic) | Jan, Feb, Mar, Apr, May, Aug, Sep, Oct, Nov, Dec | 006 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | single sample | report only (tox chronic) | Jul | 006 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | Jan, Feb, Mar, Apr, May, Aug, Sep, Oct, Nov, Dec | 006 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | Jul | 006 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | Aug, Sep | 006 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | Jul | 006 |
| Static Renewal 7 Day Chronic Pimephales promelas | single sample | report only (tox chronic) | Jan, Feb, Mar, Apr, May, Aug, Sep, Oct, Nov, Dec | 006 |
| Static Renewal 7 Day Chronic Pimephales promelas | single sample | report only (tox chronic) | Jul | 006 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | Jan, Feb, Mar, Apr, May, Aug, Sep, Oct, Nov, Dec | 006 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | Jul | 006 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 84 tox chronic | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 006 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 75 tox chronic | Aug, Sep | 006 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 69 tox chronic | Jul | 006 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 007 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 007 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 007 |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year | 007 |
| pH | minimum | ≥ 6.5 SU | all year | 007 |
| pH | maximum | ≤ 9 SU | all year | 007 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .04 MGD | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| Chlorine, total residual | instantaneous maximum | ≤ .5 mg/L | all year | 007 |
| E. coli | 30-day geometric mean | ≤ 1810 #/100mL | all year | 007 |
| E. coli | maximum 7-day geometric mean | ≤ 3619 #/100mL | all year | 007 |
Cited limits by parameter: Colorado's rules and the federal ones.
Same industry: the 30 Metal Mining permits in Colorado.
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Your permit document is the final word. As JSON: /api/v1/permits/CO0041467 · MCP: https://passage-data.com/mcp