Clean Water Act discharge permit · NPDES COG501501
HOLTON LAKES SAND & GRAVEL PIT, Weld County, CO: NPDES COG501501 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 5Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
HOLTON LAKES SAND & GRAVEL PIT, held by Ready Mixed Aggregates, holds NPDES permit COG501501, which discharges to South Platte River. EPA’s file records it issued June 25, 2008 and expiring June 30, 2013. 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 | HOLTON LAKES SAND & GRAVEL PIT |
|---|---|
| Permittee as filed | Ready Mixed Aggregates |
| NPDES ID | COG501501 |
| 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 | June 25, 2008 |
| Expiration date | June 30, 2013 |
| Address | Weld County, CO 80621 |
| Receiving water | SOUTH PLATTE RIVER |
| Subwatershed | Lower Big Dry Creek (HUC 101900030408) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 8Pollutants on file
- 5Under a numeric limit
- 8With a violation of any kind
- 3With 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 | 12 | 102 | 24 | December 31, 2025 | 349% over the limit |
| Flow, in conduit or thru treatment plant | 12 | 107 | 5 | June 30, 2023 | 47% over the limit |
| pH | 12 | 81 | 3 | September 30, 2023 | |
| Iron, total recoverable | 0 | 54 | 0 | ||
| Flow, total | 0 | 43 | 0 | ||
| Oil and grease visual | 6 | 40 | 0 | ||
| Oil and grease | 6 | 39 | 0 | ||
| Conductivity | 0 | 38 | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 26, 2019 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| September 26, 2019 | Management Practice Violations - Failure to Maintain Records | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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 COG501501 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.