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Bituminous Coal - Underground, Somerset, Colorado. NPDES permit CO0000132 expired Sep 30, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6.5 SU | all year | 009 |
| pH | maximum | ≤ 9 SU | all year | 009 |
| Solids, total suspended | 30-day average | ≤ 35 mg/L | all year | 009 |
| Solids, total suspended | maximum 7-day average | ≤ 70 mg/L | all year | 009 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 009 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 009 |
| Iron, total recoverable | 30-day average | ≤ 3000 ug/L | all year | 009 |
| Iron, total recoverable | 30-day average | ≤ 1000 ug/L | all year | 009 |
| Iron, total recoverable | daily maximum | ≤ 6000 ug/L | all year | 009 |
| Iron, total recoverable | daily maximum | ≤ 6000 ug/L | all year | 009 |
| Manganese, dissolved [as Mn] | 30-day average | report only (ug/L) | all year | 009 |
| Nickel, total recoverable | 30-day average | report only (ug/L) | all year | 009 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 009 |
| Chromium, total recoverable | 30-day arithmetic mean | report only (ug/L) | all year | 009 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 009 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 009 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 009 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 009 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 009 |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | 009 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | 009 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 009 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year | 009 |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year | 009 |
| Nickel, potentially dissolvd | 30-day average | report only (ug/L) | all year | 009 |
| Nickel, potentially dissolvd | daily maximum | report only (ug/L) | all year | 009 |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 009 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 009 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 009 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .039 MGD | all year | 009 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 009 |
| Mercury, total [low level] | 30-day average | report only (ug/L) | all year | 009 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | report only (mg/L) | all year | 009 |
| Sulfate | 30-day average | report only (mg/L) | all year | 009 |
| Boron, total | 30-day average | report only (mg/L) | all year | 009 |
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | 012 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 012 |
| Conductivity | 30-day average | report only (dS/m) | all year | 012 |
| pH | minimum | ≥ 6.5 SU | all year | 012 |
| pH | maximum | ≤ 9 SU | all year | 012 |
| Bicarbonate ion- [as HCO3] | 30-day average | report only (mg/L) | all year | 012 |
| Bicarbonate ion- [as HCO3] | daily maximum | report only (mg/L) | all year | 012 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 012 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 012 |
| Calcium, total recoverable | 30-day average | report only (mg/L) | all year | 012 |
| Calcium, total recoverable | daily maximum | report only (mg/L) | all year | 012 |
| Magnesium, total recoverable | 30-day average | report only (mg/L) | all year | 012 |
| Magnesium, total recoverable | daily maximum | report only (mg/L) | all year | 012 |
| Sodium, total recoverable | 30-day average | report only (mg/L) | all year | 012 |
| Sodium, total recoverable | daily maximum | report only (mg/L) | all year | 012 |
| Sodium adsorption ratio | 30-day average | report only (Ratio) | all year | 012 |
| Sodium adsorption ratio | daily maximum | report only (Ratio) | all year | 012 |
| Sodium adsorption ratio | 30-day average | report only (Ratio) | all year | 012 |
| Sodium adsorption ratio | daily maximum | report only (Ratio) | all year | 012 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 012 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 012 |
| Iron, total recoverable | 30-day average | ≤ 3000 ug/L | all year | 012 |
| Iron, total recoverable | 30-day average | ≤ 1000 ug/L | all year | 012 |
| Iron, dissolved [as Fe] | 30-day average | report only (ug/L) | all year | 012 |
| Manganese, dissolved [as Mn] | 30-day average | report only (ug/L) | all year | 012 |
| Nickel, total recoverable | 30-day average | report only (ug/L) | all year | 012 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 012 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 012 |
| Chromium, total recoverable | 30-day average | report only (ug/L) | all year | 012 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 012 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 012 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 012 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 012 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 012 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 012 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 012 |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | 012 |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | 012 |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | 012 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year | 012 |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year | 012 |
| Nickel, potentially dissolvd | 30-day average | report only (ug/L) | all year | 012 |
| Nickel, potentially dissolvd | daily maximum | report only (ug/L) | all year | 012 |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 012 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 012 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 012 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 012 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .004 MGD | all year | 012 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 012 |
| Mercury, total [low level] | 30-day average | report only (ug/L) | all year | 012 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | report only (mg/L) | all year | 012 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 012 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 012 |
| Sulfate | 30-day average | report only (mg/L) | all year | 012 |
| Boron, total | 30-day average | report only (mg/L) | all year | 012 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 012 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | single sample | report only (tox chronic) | all year | 012 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year | 012 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year | 012 |
| Static Renewal 7 Day Chronic Pimephales promelas | single sample | report only (tox chronic) | all year | 012 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | all year | 012 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | all year | 012 |
Cited limits by parameter: Colorado's rules and the federal ones.
Same industry: the 19 Coal Mining permits in Colorado.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/CO0000132 · MCP: https://passage-data.com/mcp