Clean Water Act discharge permit · NPDES COG641066
CASTLE CREEK WTP, Pitkin County, CO: NPDES COG641066 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 8Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
CASTLE CREEK WTP, held by Aspen City of, holds NPDES permit COG641066, which discharges to 001;Castlecrk/002/003;Holden Dtch. EPA’s file records it issued January 9, 2006 and expiring October 31, 2010. 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 | CASTLE CREEK WTP |
|---|---|
| Permittee as filed | Aspen City of |
| NPDES ID | COG641066 |
| 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 9, 2006 |
| Expiration date | October 31, 2010 |
| Address | Pitkin County, CO 81611 |
| Receiving water | 001;CASTLECRK/002/003;HOLDEN DTCH |
| Subwatershed | Outlet Castle Creek (HUC 140100040203) |
| Other EPA IDs (FRS) | RCRA handler COD983790924 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 8Pollutants on file
- 8Under a numeric limit
- 8With a violation of any kind
- 2With 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 |
|---|---|---|---|---|---|
| Chlorine, total residual | 6 | 8 | 6 | June 30, 2008 | 355% over the limit |
| Solids, total suspended | 6 | 8 | 2 | June 30, 2015 | 49% over the limit |
| Solids, total dissolved | 6 | 9 | 0 | ||
| pH | 6 | 2 | 0 | ||
| Fluoride, total [as F] | 6 | 2 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 2 | 0 | ||
| Oil and grease | 3 | 1 | 0 | ||
| Oil and grease visual | 3 | 1 | 0 |
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 COG641066.
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, COG641066.
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 COG641066 there.
Nearby on the register
- Discharge permits in Pitkin County
- Every permit record in Pitkin 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.