Clean Water Act discharge permit · NPDES COG317181
CITY OF ARVADA NORTH TRUNK SEWER IMPROVEMENTS, Arvada, CO: NPDES COG317181 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 23Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
CITY OF ARVADA NORTH TRUNK SEWER IMPROVEMENTS, held by BT Construction Inc, holds NPDES permit COG317181, which discharges to Clear Creek. EPA’s file records it issued January 13, 2025 and expiring May 31, 2028. 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 | CITY OF ARVADA NORTH TRUNK SEWER IMPROVEMENTS |
|---|---|
| Permittee as filed | BT Construction Inc |
| NPDES ID | COG317181 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | January 13, 2025 |
| Expiration date | May 31, 2028 |
| Address | Arvada, CO 80003 |
| Receiving water | Clear Creek |
| Subwatershed | Outlet Clear Creek (HUC 101900040404) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 23Pollutants on file
- 23Under a numeric limit
- 1With a violation of any kind
- 1With 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 |
|---|---|---|---|---|---|
| Mercury, total [low level] | 1 | 1 | 1 | October 31, 2025 | 94% over the limit |
| pH | 2 | 0 | 0 | ||
| Solids, total suspended | 2 | 0 | 0 | ||
| Zinc, potentially dissolved | 2 | 0 | 0 | ||
| Copper, potentially dissolved | 2 | 0 | 0 | ||
| Cadmium, potentially dissolvd | 2 | 0 | 0 | ||
| Lead, potentially dissolvd | 2 | 0 | 0 | ||
| Manganese, potentially dissolvd | 2 | 0 | 0 | ||
| Selenium, potentially dissolvd | 2 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| Chlorine, total residual | 2 | 0 | 0 | ||
| Phosphorus, total [as P] | 1 | 0 | 0 | ||
| Arsenic, total recoverable | 1 | 0 | 0 | ||
| Iron, total recoverable | 1 | 0 | 0 | ||
| Manganese, dissolved [as Mn] | 1 | 0 | 0 | ||
| Nickel, total recoverable | 1 | 0 | 0 | ||
| Cadmium, total recoverable | 1 | 0 | 0 | ||
| Lead, total recoverable | 1 | 0 | 0 | ||
| Chromium, total recoverable | 1 | 0 | 0 | ||
| Oil and grease | 1 | 0 | 0 | ||
| Uranium, total | 1 | 0 | 0 | ||
| Flow, total | 1 | 0 | 0 | ||
| Oil and grease visual | 1 | 0 | 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 COG317181.
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 COG317181 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.