Clean Water Act discharge permit · NPDES COG850051
6 MAIN NORTH (6MN) SEDIMENTATION POND, La Plata County, CO: NPDES COG850051 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 6Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
6 MAIN NORTH (6MN) SEDIMENTATION POND, held by Twenty Mile Coal LLC, holds NPDES permit COG850051, which discharges to Fish Creek. EPA’s file records it issued January 25, 2010 and expiring June 30, 2013. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
What the register holds for 6 MAIN NORTH (6MN) SEDIMENTATION POND: its NPDES ID, its permit type and status, its dates, its address in La Plata County, Colorado, its receiving water, and 6 pollutants under a numeric limit. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES COG850051.
Identity
| Facility as filed | 6 MAIN NORTH (6MN) SEDIMENTATION POND |
|---|---|
| Permittee as filed | Twenty Mile Coal LLC |
| NPDES ID | COG850051 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | January 25, 2010 |
| Expiration date | June 30, 2013 |
| Address | La Plata County, CO 80467 |
| Receiving water | Fish Creek |
| Subwatershed | Outlet Fish Creek (HUC 140500010504) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 6Pollutants on file
- 6Under a numeric limit
- 0With a violation of any kind
- 0With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| pH | 2 | 0 | 0 | ||
| Solids, settleable | 2 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| Solids, total dissolved | 2 | 0 | 0 | ||
| Oil and grease | 1 | 0 | 0 | ||
| Oil and grease visual | 1 | 0 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES COG850051.
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES COG850051.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID COG850051 there.
Nearby on the register
- Discharge permits in La Plata County
- Every permit record in La Plata County, A to Z
- Discharge permits in Colorado
- Every permit record in Colorado, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.