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Clean Water Act discharge permit · NPDES COG074358

CS LONE TREE, Lone Tree, CO: NPDES COG074358 discharge permit, effluent exceedances, inspections, penalties

CS LONE TREE, held by Mortenson Construction, holds NPDES permit COG074358, which discharges to Willow Creek. EPA’s file records it issued February 19, 2013 and expiring September 30, 2013. 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.

Identity

Facility as filedCS LONE TREE
Permittee as filedMortenson Construction
NPDES IDCOG074358
Permit statusEffective
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedFebruary 19, 2013
Expiration dateSeptember 30, 2013
AddressLone Tree, CO 80124
Receiving waterWillow Creek
SubwatershedLittle Dry Creek (HUC 101900020903)
SIC1799 – 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

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
pH2140
Solids, total suspended2140
Selenium, potentially dissolvd2140
Flow, in conduit or thru treatment plant2120
E. coli2100
Oil and grease170
Oil and grease visual170

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES COG074358.

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 COG074358.

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 COG074358 there.

Nearby on the register

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

What this page shows

This public-records page covers Clean Water Act discharge permit COG074358 for CS LONE TREE in Lone Tree, CO, held by Mortenson Construction, which discharges to Willow Creek within the Little Dry Creek subwatershed (HUC 101900020903). The page lists 7 pollutants on file, 7 under a numeric limit, 7 with a violation of any kind, and 0 with an effluent exceedance.