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Clean Water Act discharge permit · NPDES COR409732

TERRAIN, Castle Rock, CO: NPDES COR409732 discharge permit, effluent exceedances, inspections, penalties

TERRAIN, held by Garrett Construction, LLC, holds NPDES permit COR409732. EPA’s file records it issued July 30, 2020 and expiring March 31, 2024. 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 TERRAIN: its NPDES ID, its permit type and status, its dates, its address in Castle Rock, Colorado. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES COR409732.

Identity

Facility as filedTERRAIN
Permittee as filedGarrett Construction, LLC
NPDES IDCOR409732
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedJuly 30, 2020
Expiration dateMarch 31, 2024
Issuing agencySTA
AddressCastle Rock, CO 80108
SubwatershedRussellville Gulch-Cherry Creek (HUC 101900030106)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

EPA’s limits and effluent violation files hold no pollutant row for NPDES COR409732.

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES COR409732.

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 COR409732 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

The TERRAIN general permit coverage held by Garrett Construction, LLC in Castle Rock, Douglas County, Colorado, is one of 289 general permit coverages on EPA's NPDES register in Douglas County, this one included. It sits within the Russellville Gulch-Cherry Creek subwatershed, which holds 14 NPDES permits, this one included. Of the 289 Douglas County general permit coverages, 12.5% have a violation on file, and the permit itself has no pollutants under a numeric limit and no effluent exceedances on record.