Clean Water Act discharge permit · NPDES COG502236
NORTH HANGS MINE, Silt, CO: NPDES COG502236 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
NORTH HANGS MINE, held by Western Slope Materials LLC, holds NPDES permit COG502236, which discharges to Lower Colorado River To Colorado River. EPA’s file records it issued July 16, 2025 and expiring December 31, 2026. 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.
Identity
| Facility as filed | NORTH HANGS MINE |
|---|---|
| Permittee as filed | Western Slope Materials LLC |
| NPDES ID | COG502236 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | July 16, 2025 |
| Expiration date | December 31, 2026 |
| Address | Silt, CO 81652 |
| Receiving water | Lower Colorado River to Colorado River |
| Subwatershed | Dry Creek-Colorado River (HUC 140100050604) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 9Pollutants on file
- 9Under a numeric limit
- 9With 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 | 4 | 0 | ||
| Solids, total suspended | 2 | 4 | 0 | ||
| Iron, total recoverable | 2 | 4 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 4 | 0 | ||
| Solids, total dissolved | 2 | 4 | 0 | ||
| Arsenic, total recoverable | 1 | 2 | 0 | ||
| Oil and grease | 1 | 2 | 0 | ||
| Flow, total | 1 | 2 | 0 | ||
| Oil and grease visual | 1 | 2 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES COG502236.
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 COG502236.
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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, COG502236.
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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 COG502236 there.
Nearby on the register
- Discharge permits in Silt
- Every permit record in Silt, 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.