- Jones & Stokes Associates Environmental Consultants
- Bellevue - Provides natural resource management, planning, and environmental consulting services. Offices in California, Arizona and Washington. - Forest Technology Systems
- Bellingham - Provides environmental monitoring hardware, software, and communication systems for fire, weather, and water shed applications. - Mt. Fury Company, Inc.
- Issaquah - Automating polymer dosage in dewatering and clarification using suspended solids and turbidity meters. - Landau Associates
- Edmonds - Providing geotechnical and environmental services. - North Creek Analytical, Inc.
- Bothell - Offers analytical services including organic and inorganic procedures on a variety of matrices to clients throughout the Pacific Rim. - Prototek Corporation
- Poulsbo - Makes and sells equipment for the liquid waste haulers industry, including transmitter/receiver systems for locating septic tanks and line blockages. - Enviro Klean Technology Inc.
- Blaine - Research and manufacturing of mobile soil-cleaning equipment, specifrically for the removal of hydrocarbon contaminated soils. - Watershed Company, The
- Kirkland - Specialising in the evaluation and rehabilitation of rivers, streams, wetlands, and other wildlife habitat. - PetroSorb
- Everett - Manufacturer of environmentally friendly Petro-KwikSorb reusable absorbents and EZ-Sweep sorbents for spill clean up.
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