Clean Water Act discharge permit · NPDES COR090034
THORNTON MS4, City Of Thornton, CO: NPDES COR090034 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
THORNTON MS4, held by Thornton City of, holds NPDES permit COR090034, which discharges to Croke Lake To Croke Reservoir. EPA’s file records it issued March 10, 2008 and expiring March 9, 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.
What the register holds for THORNTON MS4: its NPDES ID, its permit type and status, its dates, its address in City Of Thornton, Colorado, its receiving water. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES COR090034.
Identity
| Facility as filed | THORNTON MS4 |
|---|---|
| Permittee as filed | Thornton City of |
| NPDES ID | COR090034 |
| 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 |
| Program | Small municipal storm sewer systems |
| Issued | March 10, 2008 |
| Expiration date | March 9, 2013 |
| Address | City Of Thornton, CO 80241 |
| Receiving water | Croke Lake to Croke Reservoir |
| Subwatershed | City of Thornton-South Platte River (HUC 101900030402) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 0Pollutants on file
- 0Under a numeric limit
- 0With a violation of any kind
- 0With an effluent exceedance
EPA’s limits and effluent violation files hold no pollutant row for NPDES COR090034.
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 COR090034.
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, COR090034.
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 COR090034 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.