Clean Water Act discharge permit · NPDES COR427750

AURORA DECANT BAY, Aurora, CO: NPDES COR427750 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

AURORA DECANT BAY, held by American West Construction LLC, holds NPDES permit COR427750. EPA’s file records it issued June 5, 2025 and expiring March 31, 2029.

AURORA DECANT BAY, Aurora, Colorado: Coverage under a general permit COR427750, held by American West Construction LLC; Effective; issued June 5, 2025, term to March 31, 2029, by STA.

Other permits held by American West Construction LLC

EVERGREEN LAKE DAM OUTLET WORKS REHAB, Evergreen: COG081441, issued February 18, 2026
STR 0241-069 CDOT US 24 RESURFACE, Leadville: COG081546, issued July 7, 2026
GRANGE HALL CREEK TRIBUTARY SOUTH-DW, Thornton: COG081583, issued August 27, 2026
AURORA ARV, PRV, AND LARGE VALVE REPLACEMENT, Aurora: COG317189, issued January 27, 2025
NORTH DRY GULCH CP3 IMPROVEMENTS, Lakewood: COG317232, issued October 24, 2025
NORTH DRY GULCH CP3 IMPROVEMENTS, Lakewood: COR428960, issued October 13, 2025
EVERGREEN LAKE DAM OUTLET WORKS REHAB, Evergreen: COR429941, issued February 9, 2026

AURORA DECANT BAY among its neighbors

EPA’s permit file holds 64 discharge permits in the Coal Creek subwatershed (HUC 101900030202), COR427750 among them. Its county holds 449, 3 of them major permits; COR427750 is a minor permit.

Other permits in the Coal Creek subwatershed (HUC 101900030202)

24394 GUN CLUB AT HAMPDEN TURN LANE, Aurora: COR420315, minor permit, permit term to March 31, 2024
3500 SOUTH GUN CLUB ROAD SOLAR GARDEN NORTH (DE), Aurora: COR428998, minor permit, permit term to March 31, 2029
3500 SOUTH GUN CLUB ROAD SOLAR GARDEN SOUTH (DE), Unincorporated: COR429168, minor permit, permit term to March 31, 2029
APS FOUNDRY P8, Aurora: COR429869, minor permit, permit term to March 31, 2029
ARAPAHOE PARK RACETRACK, Arapahoe County: COG589073, minor permit, discharging to Murphy Creek, permit term to October 31, 2010
ARAPAHOE PARK RACETRACK WWTF, Aurora: COG591073, minor permit, discharging to Unnamed tributary to Murphy Crk to Sand Crk, permit term to December 31, 2029
AURORA FIRST ASSEMBLY OF GOD DBA HIGHPOINT CHURCH, Aurora: COR429561, minor permit, permit term to March 31, 2029
COAL CREEK IMPROVEMENTS AT WATERSTONE-DW, Aurora: COG080901, minor permit, discharging to Coal Creek, permit term to May 31, 2025
COAL CREEK WASTEWATER REC FAC, Aurora: COL041074, minor permit, permit term to December 31, 2025
COAL CREEK WW RECLAMATION FAC, Aurora: COG589108, minor permit, discharging to Coal Creek, permit term to October 31, 2010

What the register holds for AURORA DECANT BAY: its NPDES ID, its permit type and status, its dates, its address in Aurora, Colorado. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES COR427750.

Identity

Facility as filed	AURORA DECANT BAY
Permittee as filed	American West Construction LLC
NPDES ID	COR427750
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	June 5, 2025
Expiration date	March 31, 2029
Issuing agency	STA
Address	Aurora, CO 80018
Subwatershed	Coal Creek (HUC 101900030202)

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 COR427750.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES COR427750.

Inspections

EPA’s inspection file holds no inspection for NPDES COR427750.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES COR427750.

Watch this permit

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Nearby on the register

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

The AURORA DECANT BAY permit, held by American West Construction LLC, is one of 360 general permit coverages in Arapahoe County, and 10.8% of those coverages have a violation on file. It sits within the Coal Creek subwatershed, where 64 NPDES permits, this one included, are listed. The permit records no pollutants under a numeric limit and no pollutants with an effluent exceedance.