Clean Water Act discharge permit · NPDES COG317220
THORNTON SLUDGE, Thornton, CO: NPDES COG317220 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 115Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
THORNTON SLUDGE, held by WW Clyde & Co, holds NPDES permit COG317220, which discharges to South Platte River. EPA’s file records it issued August 11, 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 SLUDGE |
|---|---|
| Permittee as filed | WW Clyde & Co |
| NPDES ID | COG317220 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | August 11, 2025 |
| Expiration date | May 31, 2028 |
| Address | Thornton, CO 80229 |
| Receiving water | South Platte River |
| Subwatershed | City of Thornton-South Platte River (HUC 101900030402) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 115Pollutants on file
- 115Under a numeric limit
- 2With 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; the 60 with the most exceedances of 115 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Selenium, potentially dissolvd | 18 | 1 | 1 | November 30, 2025 | 48% over the limit |
| Chromium, total recoverable | 11 | 1 | 0 | ||
| Copper, potentially dissolved | 18 | 0 | 0 | ||
| Lead, potentially dissolvd | 18 | 0 | 0 | ||
| Manganese, potentially dissolvd | 18 | 0 | 0 | ||
| pH | 14 | 0 | 0 | ||
| Solids, total suspended | 14 | 0 | 0 | ||
| Phosphorus, total [as P] | 14 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 14 | 0 | 0 | ||
| Chlorine, total residual | 14 | 0 | 0 | ||
| Arsenic, total recoverable | 11 | 0 | 0 | ||
| Iron, total recoverable | 11 | 0 | 0 | ||
| Manganese, dissolved [as Mn] | 11 | 0 | 0 | ||
| Lead, total recoverable | 11 | 0 | 0 | ||
| Uranium, total | 11 | 0 | 0 | ||
| Oil and grease | 7 | 0 | 0 | ||
| Flow, total | 7 | 0 | 0 | ||
| Oil and grease visual | 7 | 0 | 0 | ||
| Selenium, total recoverable | 4 | 0 | 0 | ||
| Thallium, total recoverable | 4 | 0 | 0 | ||
| Beryllium, total recoverable [as Be] | 4 | 0 | 0 | ||
| Barium, total recoverable | 4 | 0 | 0 | ||
| Iron, dissolved [as Fe] | 4 | 0 | 0 | ||
| Nickel, total recoverable | 4 | 0 | 0 | ||
| Silver total recoverable | 4 | 0 | 0 | ||
| Zinc, total recoverable | 4 | 0 | 0 | ||
| Aluminum, total recoverable | 4 | 0 | 0 | ||
| Cadmium, total recoverable | 4 | 0 | 0 | ||
| Copper, total recoverable | 4 | 0 | 0 | ||
| Molybdenum, total recoverable | 4 | 0 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 4 | 0 | 0 | ||
| Antimony, total recoverable | 4 | 0 | 0 | ||
| Zinc, potentially dissolved | 4 | 0 | 0 | ||
| Silver, potentially dissolved | 4 | 0 | 0 | ||
| Arsenic, potentially dissolved | 4 | 0 | 0 | ||
| Cadmium, potentially dissolvd | 4 | 0 | 0 | ||
| Chromium, trivalent, potentially dissolvd | 4 | 0 | 0 | ||
| Nickel, potentially dissolvd | 4 | 0 | 0 | ||
| Thallium, potentially dissolvd | 4 | 0 | 0 | ||
| Uranium, potentially dissolvd | 4 | 0 | 0 | ||
| Total phenols | 4 | 0 | 0 | ||
| Chromium, trivalent total recoverable | 4 | 0 | 0 | ||
| Carbon tetrachloride | 4 | 0 | 0 | ||
| 1,2-Dichloroethane | 4 | 0 | 0 | ||
| Bromoform | 4 | 0 | 0 | ||
| Chloroform | 4 | 0 | 0 | ||
| Toluene | 4 | 0 | 0 | ||
| Benzene | 4 | 0 | 0 | ||
| Acenaphthene | 4 | 0 | 0 | ||
| Acrolein | 4 | 0 | 0 | ||
| Anthracene | 4 | 0 | 0 | ||
| Benzo[k]fluoranthene | 4 | 0 | 0 | ||
| Benzo[a]pyrene | 4 | 0 | 0 | ||
| Bis[2-chloroethyl] ether | 4 | 0 | 0 | ||
| Bis[2-chloroisopropyl] ether | 4 | 0 | 0 | ||
| Butyl benzyl phthalate | 4 | 0 | 0 | ||
| Chlorobenzene | 4 | 0 | 0 | ||
| Chlorodibromomethane | 4 | 0 | 0 | ||
| Chrysene | 4 | 0 | 0 | ||
| Diethyl phthalate | 4 | 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 COG317220.
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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, COG317220.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 COG317220 there.
Nearby on the register
- Discharge permits in Thornton
- Every permit record in Thornton, 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.