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Bituminous Coal And Lignite - Surface, Oak Creek, Colorado. NPDES permit CO0036684 expired Apr 30, 2012; its limits still apply. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Solids, settleable, daily maximum | .53 mL/L | ≤ .5 mL/L | 6% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 35 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 35 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 70 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 70 mg/L | all year | 001 |
| Solids, settleable | 30-day average | report only (mL/L) | all year | 001 |
| Solids, settleable | 30-day average | report only (mL/L) | all year | 001 |
| Solids, settleable | daily maximum | ≤ .5 mL/L | all year | 001 |
| Solids, settleable | daily maximum | ≤ .5 mL/L | all year | 001 |
| Iron, total recoverable | 30-day average | ≤ 1000 ug/L | all year | 001 |
| Iron, total recoverable | 30-day average | ≤ 1000 ug/L | all year | 001 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/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 | ≤ .46 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .46 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | monthly average minimum | report only (tox chronic) | all year | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average minimum | report only (tox chronic) | all year | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average minimum | report only (tox chronic) | all year | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | minimum value | report only (tox chronic) | all year | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | minimum value | report only (tox chronic) | all year | 001 |
| Solids, total dissolved | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Solids, total dissolved | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 001 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (%) | all year | 001 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (%) | all year | 001 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (%) | all year | 001 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | report only (%) | all year | 001 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | monthly average minimum | report only (%) | all year | 001 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | monthly average minimum | report only (%) | all year | 001 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | minimum value | report only (%) | all year | 001 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | minimum value | report only (%) | all year | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | monthly average minimum | report only (tox chronic) | all year | 01Y |
| Toxicity [chronic], Ceriodaphnia dubia | monthly average minimum | report only (tox chronic) | all year | 01Y |
| Toxicity [chronic], Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year | 01Y |
| Toxicity [chronic], Ceriodaphnia dubia | minimum value | report only (tox chronic) | all year | 01Y |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average minimum | report only (tox chronic) | all year | 01Y |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average minimum | report only (tox chronic) | all year | 01Y |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | minimum value | report only (tox chronic) | all year | 01Y |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | minimum value | report only (tox chronic) | all year | 01Y |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (%) | all year | 01Y |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | report only (%) | all year | 01Y |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | minimum value | ≥ 100 % | all year | 01Y |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average minimum | ≥ 100 % | all year | 01Y |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | monthly average minimum | report only (%) | all year | 01Y |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | monthly average minimum | report only (%) | all year | 01Y |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | minimum value | ≥ 100 % | all year | 01Y |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | minimum value | ≥ 100 % | all year | 01Y |
| Arsenic, total [as As] | 30-day average | report only (ug/L) | all year | MON |
| Arsenic, total [as As] | 30-day average | report only (ug/L) | all year | MON |
| Arsenic, total [as As] | daily maximum | report only (ug/L) | all year | MON |
| Arsenic, total [as As] | daily maximum | report only (ug/L) | all year | MON |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | MON |
| Zinc, potentially dissolved | 30-day average | report only (ug/L) | all year | MON |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | MON |
| Zinc, potentially dissolved | daily maximum | report only (ug/L) | all year | MON |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | all year | MON |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | all year | MON |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | MON |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | MON |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | MON |
| Copper, potentially dissolved | 30-day average | report only (ug/L) | all year | MON |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | MON |
| Copper, potentially dissolved | daily maximum | report only (ug/L) | all year | MON |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | MON |
| Cadmium, potentially dissolvd | 30-day average | report only (ug/L) | all year | MON |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | MON |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | MON |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | MON |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | MON |
| Chromium, trivalent, potentially dissolvd | daily maximum | report only (ug/L) | all year | MON |
| Chromium, trivalent, potentially dissolvd | daily maximum | report only (ug/L) | all year | MON |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | MON |
| Lead, potentially dissolvd | 30-day average | report only (ug/L) | all year | MON |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | MON |
| Lead, potentially dissolvd | daily maximum | report only (ug/L) | all year | MON |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year | MON |
| Manganese, potentially dissolvd | 30-day average | report only (ug/L) | all year | MON |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year | MON |
| Manganese, potentially dissolvd | daily maximum | report only (ug/L) | all year | MON |
| Nickel, potentially dissolvd | 30-day average | report only (ug/L) | all year | MON |
| Nickel, potentially dissolvd | 30-day average | report only (ug/L) | all year | MON |
| Nickel, potentially dissolvd | daily maximum | report only (ug/L) | all year | MON |
| Nickel, potentially dissolvd | daily maximum | report only (ug/L) | all year | MON |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | MON |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | MON |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | MON |
| Selenium, potentially dissolvd | daily maximum | report only (ug/L) | all year | MON |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year | MON |
| Mercury, total [as Hg] | 30-day average | report only (ug/L) | all year | MON |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year | MON |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year | MON |
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/CO0036684 · MCP: https://passage-data.com/mcp