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Railroads, Line-Haul Operating, Gilpin County, Colorado. NPDES permit CO0047554 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit 13 times (last August 2026), 2 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit |
|---|---|---|---|---|
| October 2025 | 300 | Turbidity, daily maximum | 248.99 NTU | ≤ 175 NTU |
| November 2025 | 300 | Turbidity, daily maximum | 884.3 NTU | ≤ 175 NTU |
| December 2025 | 300 | Turbidity, daily maximum | 225.2 NTU | ≤ 175 NTU |
| January 2026 | 001 | pH, minimum | 6.37 SU | ≥ 6.5 SU |
| January 2026 | 300 | Turbidity, daily maximum | 351 NTU | ≤ 175 NTU |
| February 2026 | 001 | pH, minimum | 6.006 SU | ≥ 6.5 SU |
| February 2026 | 300 | Turbidity, daily maximum | 999 NTU | ≤ 175 NTU |
| March 2026 | 300 | Turbidity, daily maximum | 946.5 NTU | ≤ 175 NTU |
| April 2026 | 300 | Turbidity, daily maximum | 923.3 NTU | ≤ 175 NTU |
| May 2026 | 300 | Turbidity, daily maximum | 244 NTU | ≤ 175 NTU |
| June 2026 | 300 | Turbidity, daily maximum | 431.95 NTU | ≤ 175 NTU |
| July 2026 | 300 | Turbidity, daily maximum | 236.2 NTU | ≤ 175 NTU |
| August 2026 | 300 | Turbidity, daily maximum | 261.06 NTU | ≤ 175 NTU |
| 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 |
| Turbidity | 30-day average | report only (NTU) | all year | 001 |
| Turbidity | daily maximum | report only (NTU) | 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 | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, weak acid, dissociable | rolling average | ≤ 3.6 ug/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 (Ratio) | all year | 001 |
| Sodium adsorption ratio | daily maximum | report only (Ratio) | all year | 001 |
| Sodium adsorption ratio | 30-day average | report only (Ratio) | all year | 001 |
| Sodium adsorption ratio | daily maximum | report only (Ratio) | all year | 001 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Iron, total recoverable | 30-day average | ≤ 3100 ug/L | all year | 001 |
| Iron, dissolved [as Fe] | 30-day average | ≤ 962 ug/L | all year | 001 |
| Manganese, dissolved [as Mn] | 30-day average | ≤ 182 ug/L | all year | 001 |
| Aluminum, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Aluminum, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Aluminum, total recoverable | rolling average | report only (ug/L) | all year | 001 |
| Molybdenum, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | rolling average | ≤ 9.2 ug/L | all year | 001 |
| Zinc, potentially dissolved | 30-day average | ≤ 49 ug/L | all year | 001 |
| Zinc, potentially dissolved | daily maximum | ≤ 267 ug/L | all year | 001 |
| Silver, potentially dissolved | 30-day average | report only (ug/L) | all year | 001 |
| Silver, potentially dissolved | 30-day average | ≤ .06 ug/L | all year | 001 |
| Silver, potentially dissolved | daily maximum | report only (ug/L) | all year | 001 |
| Silver, potentially dissolved | daily maximum | ≤ 1.4 ug/L | all year | 001 |
| Silver, potentially dissolved | rolling average | report only (ug/L) | all year | 001 |
| Silver, potentially dissolved | 30-day average | ≤ .0053 ug/L | all year | 001 |
| Copper, potentially dissolved | 30-day average | ≤ 7 ug/L | all year | 001 |
| Copper, potentially dissolved | daily maximum | ≤ 12 ug/L | all year | 001 |
| Cadmium, potentially dissolvd | 30-day average | ≤ 1 ug/L | all year | 001 |
| Cadmium, potentially dissolvd | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, potentially dissolvd | rolling average | report only (ug/L) | all year | 001 |
| Cadmium, potentially dissolvd | rolling average | ≤ .7 ug/L | all year | 001 |
| Chromium, trivalent, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Lead, potentially dissolvd | 30-day average | ≤ 3.7 ug/L | all year | 001 |
| Lead, potentially dissolvd | daily maximum | ≤ 90 ug/L | all year | 001 |
| Nickel, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Nickel, potentially dissolvd | rolling average | report only (ug/L) | all year | 001 |
| Selenium, potentially dissolvd | 30-day average | report only (ug/L) | all year | 001 |
| Selenium, potentially dissolvd | rolling average | report only (ug/L) | all year | 001 |
| Selenium, potentially dissolvd | rolling average | ≤ 3.5 ug/L | all year | 001 |
| Oil and grease | instantaneous maximum | ≤ 10 mg/L | all year | 001 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Uranium, total | daily maximum | ≤ 91 ug/L | all year | 001 |
| Diesel range organics diesel, total, wtr | 30-day average | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | ≤ .5 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Mercury, total [as Hg] | 30-day average | ≤ .05 ug/L | all year | 001 |
| Mercury, total [as Hg] | rolling average | report only (ug/L) | all year | 001 |
| Mercury, total [as Hg] | rolling average | ≤ .018 ug/L | all year | 001 |
| Hydrocarbons, total petroleum | 30-day average | report only (mg/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 | ≥ 34 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 | ≥ 34 tox chronic | all year | 001 |
| Turbidity | daily maximum | ≤ 175 NTU | all year | 300 |
Cited limits by parameter: Colorado's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/CO0047554 · MCP: https://passage-data.com/mcp