Clean Water Act discharge permit · NPDES COR426721

EAST ARAPAHOE AVE PATH & TRANSIT STOP IMPROVEMENTS, Boulder, CO: NPDES COR426721 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

EAST ARAPAHOE AVE PATH & TRANSIT STOP IMPROVEMENTS, held by Native Sun Construction, holds NPDES permit COR426721. EPA’s file records it issued February 26, 2025 and expiring March 31, 2029.

EAST ARAPAHOE AVE PATH & TRANSIT STOP IMPROVEMENTS, Boulder, Colorado: Coverage under a general permit COR426721, held by Native Sun Construction; Effective; issued February 26, 2025, term to March 31, 2029.

Other permits held by Native Sun Construction

19TH ST & FOURMILE CANYON CREEK UNDERPASS, Boulder: COG081289, issued August 11, 2025
WASTE WATER TREATMENT PLANT (SEDGWICK CO), Sedgwick: COG081391, issued December 4, 2025
REGION 5 CULVERT REPAIRS - US 160 MP 64 (SHT 41), Mancos: COG081467, issued March 20, 2026
REGION 5 CULVERT REPAIRS - 017A015020BL - MP 15.02 (SHT 61), Antonito: COG081468, issued March 19, 2026
REGION 5 CULVERT REPAIRS - 160A054720BL - MP 54.72 (SHT 40), Mancos: COG081469, issued March 19, 2026
REGION 5 CULVERT REPAIRS - 550B028710BL - MP 28.71 (SHT 42), Durango: COG081472, issued March 19, 2026
REGION 5 CULVERT REPAIRS - 160A117120BL - MP 117.12 (SHT 54), Bayfield: COG081474, issued March 25, 2026
REGION 5 CULVERT REPAIR - 160A194420BR - MP 194.42 (SHT 55), Del Norte: COG081475, issued March 26, 2026
REGION 5 CULVERT REPAIRS - 285B053280BL - MP 53.28 (SHT 58), Monte Vista: COG081479, issued March 26, 2026
REGION 5 CULVERT REPAIR - 285B085500BL - MP 85.50 (SHT 59), Saguache: COG081481, issued March 30, 2026

EAST ARAPAHOE AVE PATH & TRANSIT STOP IMPROVEMENTS among its neighbors

EPA’s permit file holds 83 discharge permits in the City of Boulder-Boulder Creek subwatershed (HUC 101900050406), COR426721 among them. Its county holds 355, 5 of them major permits; COR426721 is a minor permit.

Other permits in the City of Boulder-Boulder Creek subwatershed (HUC 101900050406)

0456 - CENTRAL AVE BRIDGE REPLACEMENT, Boulder: COG317234, minor permit, discharging to Dry Creek No 2 Ditch-KOA Lake & South Boulder Cree, permit term to May 31, 2028
0456 - CENTRAL AVE. BRIDGE REPLACEMENT, Boulder: COR428424, minor permit, permit term to March 31, 2029
1155 CANYON CONDOMINIUMS, Boulder County: COG603165, minor permit, discharging to Boulder Creek, permit term to December 31, 2012
19TH ST MULTIMODAL IMPROVEMENTS, Boulder: COR423689, minor permit, permit term to March 31, 2029
2504 SPRUCE, Boulder: COR428064, minor permit, permit term to March 31, 2029
28TH STREET & COLORADO AVE PROTECTED INTERSECTION, Boulder: COR422059, minor permit, permit term to March 31, 2024
30 BLUFF, Boulder: COR429635, minor permit, permit term to March 31, 2029
30TH STREET SEPARATED BIKE LANES PROJECT, Boulder: COR423269, minor permit, permit term to March 31, 2029
929 PEARL ST DEWATERING SYSTEM, Boulder: COG318093, minor permit, discharging to Boulder Creek, permit term to May 31, 2028
AGILENT TECH BOULDER, Boulder: COR901298, minor permit, discharging to Boulder Creek - St Vrain Creek, permit term to June 30, 2017

What the register holds for EAST ARAPAHOE AVE PATH & TRANSIT STOP IMPROVEMENTS: its NPDES ID, its permit type and status, its dates, its address in Boulder, Colorado. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES COR426721.

Identity

Facility as filed	EAST ARAPAHOE AVE PATH & TRANSIT STOP IMPROVEMENTS
Permittee as filed	Native Sun Construction
NPDES ID	COR426721
Permit status	Effective
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	February 26, 2025
Expiration date	March 31, 2029
Address	Boulder, CO 80301
Subwatershed	City of Boulder-Boulder Creek (HUC 101900050406)

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 COR426721.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES COR426721.

Inspections

EPA’s inspection file holds no inspection for NPDES COR426721.

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 COR426721.

Watch this permit

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Nearby on the register

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

EAST ARAPAHOE AVE PATH & TRANSIT STOP IMPROVEMENTS is among 251 Boulder County general permit coverages, and 25.5% of them have a violation on file. The City of Boulder-Boulder Creek subwatershed holds 83 NPDES permits, including this coverage. Of the 249 Boulder County coverages, 57.4% were issued before this coverage.