Clean Water Act discharge permit · NPDES COG603159
W 74TH PLACE UNDERDRAIN, Jefferson County, CO: NPDES COG603159 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 5Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
W 74TH PLACE UNDERDRAIN, held by Ralston Valley Water and Sanitation, holds NPDES permit COG603159, which discharges to City Of Arvada Ponds. EPA’s file records it issued April 27, 2010 and expiring December 31, 2012. 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 | W 74TH PLACE UNDERDRAIN |
|---|---|
| Permittee as filed | Ralston Valley Water and Sanitation |
| NPDES ID | COG603159 |
| 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 | April 27, 2010 |
| Expiration date | December 31, 2012 |
| Address | Jefferson County, CO 80001 |
| Receiving water | City of Arvada Ponds |
| 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 2 | 7 | 0 | ||
| pH | 2 | 6 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 3 | 0 | ||
| Oil and grease | 1 | 3 | 0 | ||
| Oil and grease visual | 1 | 3 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES COG603159.
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 COG603159.
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.
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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 COG603159 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.