- Aguirre Engineers, Inc.
 - Englewood - Offering a wide range of environmental and waste management services including handling and remediation of radioactives and explosives. - Air Resource Specialists, Inc.
- Fort Collins - Provides consulting and support services in air quality monitoring, modelling, analysis, compliance and pollution control.
- Enecotech
- Denver - Providing construction and environmental services.
- Environmental Testing Corporation
- Aurora - A high altitude vehicle emission testing laboratory serving automotive manufacturers.
- EnviroTech Services, Inc.
- Kersey - Manufacturers of dust control and roadbase stabilization products and deicing products and application equipment.
- Geomega
- Boulder - Providing consulting, remediation, groundwater modelling, waste management, and contamination cleanup services.
- Greystone
- Denver - Environmental planning and engineering services.
- Hardy, Joseph T. & Son, Inc.
- Vail - Providing mechanical and environmental services to industry, business, and homeowners.
- Knight Armour, Inc.
- Denver - Environmental dispute resolutions, contract management, industrial health and hygiene, hazardous waste removal, and demolition and construction services.
- Landbank
- Lakewood - Restores environmentally-impaired properties to the commercial market by underwriting, insuring, acquiring, financing and remediating these properties.
- Living Water Pump Service Company, Inc.
- Conifer - Provides water and well testing services, installation of storage and filtration systems.
- Metre-General, Inc.
- Westminster - Makers of Octolig, a commercial technology that utilizes immobilized ligands for heavy metal removal from water.
- Mile High Wetlands Group, LLC
- Brighton - Organisation with the objective of creating and enhancing a sufficient acreage of wetland to meet the expected demand for credits within the service area.
- Particle Measuring Systems
- Boulder - Manufacturers of air, gas, and liquid particle counters, as well as molecular contamination monitors. Site also offers technical papers on how to monitor your cleanroom or product.
- Revegetation Exchange, Inc.
- Longmont - Distributor of erosion control materials and revegetation equipment.
- Woodward-Clyde
- Denver - Provides pollution, solid, and hazardous waste management, as well as civil and geo-technical engineering services.
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