Clean Water Act discharge permit · NPDES COG604487
THORNTON WATER PROJECT - SEGMENT 8, Brighton, CO: NPDES COG604487 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 11Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
THORNTON WATER PROJECT - SEGMENT 8, held by Thalle Construction Company Inc, holds NPDES permit COG604487, which discharges to Big Dry Creek; St. Vrain Creek. EPA’s file records it issued December 23, 2025 and expiring December 31, 2026. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | THORNTON WATER PROJECT - SEGMENT 8 |
|---|---|
| Permittee as filed | Thalle Construction Company Inc |
| NPDES ID | COG604487 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 23, 2025 |
| Expiration date | December 31, 2026 |
| Address | Brighton, CO 80603 |
| Receiving water | Big Dry Creek; St. Vrain Creek |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lower Big Dry Creek (HUC 101900030408) |
| SIC | 1629 – Heavy Construction |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 11Pollutants on file
- 11Under a numeric limit
- 11With 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 | 36 | 0 | ||
| Solids, total suspended | 6 | 36 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 6 | 36 | 0 | ||
| Oil and grease | 3 | 18 | 0 | ||
| Benzo[a]pyrene | 3 | 18 | 0 | ||
| Flow, in conduit or thru treatment plant | 3 | 18 | 0 | ||
| Flow, total | 3 | 18 | 0 | ||
| Sulfate | 3 | 18 | 0 | ||
| Duration of discharge | 3 | 18 | 0 | ||
| Oil and grease visual | 3 | 18 | 0 | ||
| Arsenic, total recoverable | 2 | 11 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES COG604487.
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 COG604487.
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 COG604487 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.