Clean Water Act discharge permit · NPDES COG501613
DUCKWORTH PIT, Longmont, CO: NPDES COG501613 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 5Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
DUCKWORTH PIT, held by Martin Marietta Materials Inc, holds NPDES permit COG501613, which discharges to Idaho And Boulder Creek. EPA’s file records it issued July 11, 2016 and expiring December 31, 2017. 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 DUCKWORTH PIT: its NPDES ID, its permit type and status, its dates, its address in Longmont, Colorado, its receiving water, and 5 pollutants under a numeric limit. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES COG501613.
Identity
| Facility as filed | DUCKWORTH PIT |
|---|---|
| Permittee as filed | Martin Marietta Materials Inc |
| NPDES ID | COG501613 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | July 11, 2016 |
| Expiration date | December 31, 2017 |
| Address | Longmont, CO 80504 |
| Receiving water | Idaho and Boulder Creek |
| Subwatershed | Firestone Lake-Saint Vrain Creek (HUC 101900050707) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 5Pollutants on file
- 5Under 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 | 6 | 0 | 0 | ||
| Solids, total suspended | 6 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 0 | 0 | ||
| Oil and grease | 3 | 0 | 0 | ||
| Oil and grease visual | 3 | 0 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES COG501613.
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 COG501613.
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, COG501613.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 COG501613 there.
Nearby on the register
- Discharge permits in Longmont
- Every permit record in Longmont, 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.