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Clean Water Act discharge permit · NPDES COR429172

E. 120TH AVENUE ROADWAY IMPROVEMENTS, Commerce City, CO: NPDES COR429172 discharge permit, effluent exceedances, inspections, penalties

E. 120TH AVENUE ROADWAY IMPROVEMENTS, held by Groundworks Development, holds NPDES permit COR429172. EPA’s file records it issued November 4, 2025 and expiring March 31, 2029. 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 E. 120TH AVENUE ROADWAY IMPROVEMENTS: its NPDES ID, its permit type and status, its dates, its address in Commerce City, Colorado. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES COR429172.

Identity

Facility as filedE. 120TH AVENUE ROADWAY IMPROVEMENTS
Permittee as filedGroundworks Development
NPDES IDCOR429172
Permit statusEffective
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedNovember 4, 2025
Expiration dateMarch 31, 2029
Issuing agencySTA
AddressCommerce City, CO 80603
SubwatershedThird Creek (HUC 101900030404)

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 COR429172.

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 COR429172.

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 COR429172 there.

Nearby on the register

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

What this page shows

This public-records page covers NPDES permit COR429172 for E. 120TH AVENUE ROADWAY IMPROVEMENTS in Commerce City, CO, held by Groundworks Development, with a status of Effective and a Minor discharger class. The register lists 0 pollutants under a numeric limit and 0 pollutants with an effluent exceedance, and the permit was issued November 4, 2025 and expires March 31, 2029.