Clean Water Act discharge permit · NPDES COG081274
THORNTON WATER PROJECT SEGMENT C (NORTH REACH) - DW, Unincorporated, CO: NPDES COG081274 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 13Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
THORNTON WATER PROJECT SEGMENT C (NORTH REACH) - DW, held by S J Louis Construction Inc, holds NPDES permit COG081274, which discharges to Big Thompson River. EPA’s file records it issued July 8, 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 | THORNTON WATER PROJECT SEGMENT C (NORTH REACH) - DW |
|---|---|
| Permittee as filed | S J Louis Construction Inc |
| NPDES ID | COG081274 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | July 8, 2025 |
| Expiration date | May 31, 2028 |
| Address | Unincorporated, CO 80550 |
| Receiving water | Big Thompson River |
| Subwatershed | Seventy Ranch (HUC 101900031001) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 13Pollutants on file
- 13Under a numeric limit
- 2With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 22 | 16 | 16 | May 31, 2026 | 393% over the limit |
| Oil and grease | 11 | 1 | 1 | March 31, 2026 | 1,620% over the limit |
| pH | 22 | 0 | 0 | ||
| Arsenic, total recoverable | 22 | 0 | 0 | ||
| Iron, total recoverable | 22 | 0 | 0 | ||
| Iron, dissolved [as Fe] | 22 | 0 | 0 | ||
| Manganese, dissolved [as Mn] | 22 | 0 | 0 | ||
| Selenium, potentially dissolvd | 22 | 0 | 0 | ||
| Uranium, total | 22 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 22 | 0 | 0 | ||
| Flow, total | 11 | 0 | 0 | ||
| Duration of discharge | 11 | 0 | 0 | ||
| Oil and grease visual | 11 | 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 COG081274.
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 COG081274 there.
Nearby on the register
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- Every permit record in Unincorporated, 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.