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Bituminous Coal - Underground, Weston, Colorado. NPDES permit CO0000906 expired May 31, 2020; its limits still apply. Last 12 months: no values over a limit, 836 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | maximum weekly average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Conductivity | 30-day average | ≤ 3.1 dS/m | all year | 001 |
| Conductivity | 30-day average | ≤ 2.1 dS/m | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Bicarbonate ion- [as HCO3] | 30-day average | report only (mg/L) | all year | 001 |
| Bicarbonate ion- [as HCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 35 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 70 mg/L | all year | 001 |
| Calcium, total recoverable | 30-day average | report only (mg/L) | all year | 001 |
| Calcium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Magnesium, total recoverable | 30-day average | report only (mg/L) | all year | 001 |
| Magnesium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Sodium, total recoverable | 30-day average | report only (mg/L) | all year | 001 |
| Sodium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Sodium adsorption ratio | 30-day average | report only (%) | all year | 001 |
| Sodium adsorption ratio | daily maximum | report only (%) | all year | 001 |
| Sodium adsorption ratio | 30-day average | report only (%) | all year | 001 |
| Sodium adsorption ratio | daily maximum | report only (%) | all year | 001 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | 30-day average | ≤ 1471 ug/L | all year | 001 |
| Iron, total recoverable | daily maximum | ≤ 6000 ug/L | all year | 001 |
| Iron, total recoverable | rolling average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | rolling average | ≤ 391 ug/L | all year | 001 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | 30-day average | ≤ 27 ug/L | all year | 001 |
| Copper, potentially dissolved | 30-day average | ≤ 18 ug/L | all year | 001 |
| Copper, potentially dissolved | daily maximum | ≤ 28 ug/L | all year | 001 |
| Copper, potentially dissolved | daily maximum | ≤ 28 ug/L | all year | 001 |
| Copper, potentially dissolved | rolling average | report only (ug/L) | all year | 001 |
| Copper, potentially dissolved | rolling average | ≤ 2.3 ug/L | all year | 001 |
| Cadmium, potentially dissolvd | 30-day average | ≤ 5 ug/L | all year | 001 |
| Cadmium, potentially dissolvd | 30-day average | ≤ .86 ug/L | all year | 001 |
| Cadmium, potentially dissolvd | daily maximum | ≤ 12 ug/L | all year | 001 |
| Cadmium, potentially dissolvd | daily maximum | ≤ 3.5 ug/L | all year | 001 |
| Cadmium, potentially dissolvd | rolling average | report only (ug/L) | all year | 001 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | ≤ 7.8 ug/L | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | ≤ 7.2 ug/L | all year | 001 |
| Selenium, potentially dissolvd | daily maximum | ≤ 29 ug/L | all year | 001 |
| Selenium, potentially dissolvd | daily maximum | ≤ 29 ug/L | all year | 001 |
| Selenium, potentially dissolvd | rolling average | report only (ug/L) | all year | 001 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ 1.08 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Mercury, total low level | 30-day average | ≤ 10 ug/L | all year | 001 |
| Mercury, total low level | 30-day average | ≤ .016 ug/L | all year | 001 |
| Mercury, total low level | rolling average | report only (ug/L) | all year | 001 |
| Sulfide-hydrogen sulfide [undissociated] | 30-day average | report only (mg/L) | all year | 001 |
| Sodium Absorption Ratio | daily maximum | report only (pass=0;fail=1) | all year | 001 |
| Boron, total | 30-day average | ≤ 40 ug/L | all year | 001 |
| Boron, total | 30-day average | ≤ 6.3 ug/L | all year | 001 |
| Boron, total | rolling average | report only (ug/L) | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (abst=0;prst=1) | all year | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | single sample | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 63 tox chronic | all year | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | single sample | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | report only (tox chronic) | all year | 001 |
| Static Renewal 7 Day Chronic Pimephales promelas | minimum value | ≥ 63 tox chronic | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 007 |
| pH | maximum | ≤ 9 SU | all year | 007 |
| Solids, total suspended | 30-day average | ≤ 35 mg/L | all year | 007 |
| Solids, total suspended | maximum 7-day average | ≤ 70 mg/L | all year | 007 |
| Solids, settleable | daily maximum | ≤ .5 mL/L | all year | 007 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 007 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 007 |
| Iron, total recoverable | 30-day average | ≤ 3000 ug/L | all year | 007 |
| Iron, total recoverable | 30-day average | ≤ 1000 ug/L | all year | 007 |
| Iron, total recoverable | daily maximum | ≤ 6000 ug/L | all year | 007 |
| Iron, total recoverable | daily maximum | ≤ 6000 ug/L | all year | 007 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 007 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 007 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 007 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 007 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 007 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 007 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 007 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year | 007 |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year | 007 |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 007 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | 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 | ≤ .72 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 |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year | 007 |
| Boron, total | 30-day average | report only (ug/L) | all year | 007 |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | minimum value | ≥ 100 % | all year | 007 |
| LC50 Static Renewal 96Hr Acute Pimephales promelas | minimum value | ≥ 100 % | all year | 007 |
| pH | minimum | ≥ 6.5 SU | all year | 008 |
| pH | maximum | ≤ 9 SU | all year | 008 |
| Solids, total suspended | 30-day average | ≤ 35 mg/L | all year | 008 |
| Solids, total suspended | maximum 7-day average | ≤ 70 mg/L | all year | 008 |
| Solids, settleable | daily maximum | ≤ .5 mL/L | all year | 008 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 008 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 008 |
| Iron, total recoverable | 30-day average | ≤ 3000 ug/L | all year | 008 |
| Iron, total recoverable | 30-day average | ≤ 1000 ug/L | all year | 008 |
| Iron, total recoverable | daily maximum | ≤ 6000 ug/L | all year | 008 |
| Iron, total recoverable | daily maximum | ≤ 6000 ug/L | all year | 008 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 008 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 008 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 008 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 008 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 008 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 008 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 008 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year | 008 |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year | 008 |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 008 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 008 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 008 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .72 MGD | all year | 008 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 008 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 008 |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year | 008 |
| Boron, total | 30-day average | report only (ug/L) | all year | 008 |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | minimum value | ≥ 100 % | all year | 008 |
| LC50 Static Renewal 96Hr Acute Pimephales promelas | minimum value | ≥ 100 % | all year | 008 |
| pH | minimum | ≥ 6.5 SU | all year | 010 |
| pH | maximum | ≤ 9 SU | all year | 010 |
| Solids, total suspended | 30-day average | ≤ 35 mg/L | all year | 010 |
| Solids, total suspended | maximum 7-day average | ≤ 70 mg/L | all year | 010 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 010 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 010 |
| Iron, total recoverable | 30-day average | ≤ 3000 ug/L | all year | 010 |
| Iron, total recoverable | 30-day average | ≤ 1000 ug/L | all year | 010 |
| Iron, total recoverable | daily maximum | ≤ 6000 ug/L | all year | 010 |
| Iron, total recoverable | daily maximum | ≤ 6000 ug/L | all year | 010 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 010 |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | 010 |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | 010 |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | 010 |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | 010 |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 010 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 010 |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year | 010 |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year | 010 |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 010 |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 010 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 010 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 010 |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year | 010 |
| Boron, total | 30-day average | report only (ug/L) | all year | 010 |
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/CO0000906 · MCP: https://passage-data.com/mcp