Clean Water Act discharge permit · NPDES COR431562

GRANGE HALL CREEK TRIBUTARY SOUTH, Thornton, CO: NPDES COR431562 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

GRANGE HALL CREEK TRIBUTARY SOUTH, held by American West Construction, LLC, holds NPDES permit COR431562. EPA’s file records it issued July 24, 2026 and expiring March 31, 2029. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

What the register holds for GRANGE HALL CREEK TRIBUTARY SOUTH: its NPDES ID, its permit type and status, its dates, its address in Thornton, Colorado. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES COR431562.

Identity

Facility as filed	GRANGE HALL CREEK TRIBUTARY SOUTH
Permittee as filed	American West Construction, LLC
NPDES ID	COR431562
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	July 24, 2026
Expiration date	March 31, 2029
Issuing agency	STA
Address	Thornton, CO 80229
Subwatershed	City of Thornton-South Platte River (HUC 101900030402)
SIC	1799 – Special Trade Contractors

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same 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 COR431562.

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 COR431562.

Inspections

EPA’s inspection file holds no inspection for NPDES COR431562.

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 COR431562.

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 COR431562 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

GRANGE HALL CREEK TRIBUTARY SOUTH, a general permit coverage held by American West Construction, LLC, is one of 151 NPDES permits in the City of Thornton-South Platte River subwatershed, and it is one of 9 general permit coverages in Thornton, where 66.7% of all 9 coverages, this one included, carry an earlier issue date than this permit. The 9 general permit coverages in Thornton show a 0.0% rate of violations on file, and this permit has no pollutants under a numeric limit and no effluent exceedances recorded.