Clean Water Act discharge permit · NPDES COG073961
LEYDEN ROCK OUTFALL, Arvada, CO: NPDES COG073961 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 5Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
LEYDEN ROCK OUTFALL, held by Nelson Pipeline Construction Inc, holds NPDES permit COG073961, which discharges to Leyden Creek. EPA’s file records it issued January 16, 2012 and expiring September 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.
Identity
| Facility as filed | LEYDEN ROCK OUTFALL |
|---|---|
| Permittee as filed | Nelson Pipeline Construction Inc |
| NPDES ID | COG073961 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | January 16, 2012 |
| Expiration date | September 30, 2013 |
| Address | Arvada, CO 80001 |
| Receiving water | Leyden Creek |
| Subwatershed | Lower Ralston Creek (HUC 101900040304) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 5Pollutants on file
- 5Under a numeric limit
- 5With 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 | 4 | 14 | 0 | ||
| Solids, total suspended | 4 | 14 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 13 | 0 | ||
| Oil and grease | 2 | 7 | 0 | ||
| Oil and grease visual | 2 | 7 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES COG073961.
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 COG073961.
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 COG073961 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.