Tel: (360) 693-4555 | FAX: (360) 699-6242 18405 SE Mill Plain Blvd #100, Vancouver, WA 98683

Welcome To Olson Environmental

Olson Environmental LLC offers a full range of wetland and wildlife services. Since 1991, Olson Environmental LLC has completed over 3,000 natural resource-based projects in the Pacific Northwest, including residential, commercial, and retail development as well as public works and transportation projects for local counties and cities.

In addition,  Stormwater Facility Maintenance is a growing service within Olson Environmental. Protecting the land and your investment, and preventing fines, means hiring certified wetland management professionals to manage your stormwater facility. Key factors include the type of vegetation and growth – some trees cannot be removed, while invasive species are required for removal. Through our extensive knowledge, we are able to operate and manage the facility most efficiently, resulting in lower fees than most landscape companies, who may put your facility at risk. We have decades of experience and manage dozens of residential, commercial and industrial development.

Request a free estimate for your facility by contacting Operations Manager, Aaron Gibson at (360) 693-4555.

Wetland and wildlife services offered by Olson Environmental LLC include wetland delineation, habitat assessments, mitigation monitoring, mitigation planning, stormwater facility maintenance, technical writing, biological assessments, SEPA, JARPA, ESA compliance, and wetland/habitat mitigation planting & maintenance. Olson Environmental has prepared or assisted in the preparation of critical areas ordinances for the Cities of Washougal, LaCenter, Yacolt, and Winlock and environmental documents for Urban Growth Boundary expansion for LaCenter and Washougal. Additional services include GIS Analysis and GPS mapping.

MacKay Sposito, Olson Engineering and Olson Environmental Join Forces

Effective October 1, MacKay Sposito and Olson Engineering/Olson Environmental are joining forces, bringing together the best of our respective companies to better serve our clients and community. The combined firm will do business under the name MacKay Sposito. Deeply rooted in Clark County for more than 40 years, both MacKay Sposito and Olson realize that our respective success is due to our people and our relationships.

Our clients will see no difference in project delivery. On the contrary, they can expect an even deeper bench and more resources. With a combined staff of more than 160 employees, we look forward to the opportunity to expand our reach, grow our business and — most importantly — continue to deliver successful projects. We will continue to work from our four office locations, and our headquarters will remain in Vancouver, WA.

Why are we excited?

Founded in 1968, Olson Engineering was seeking ways to expand into additional markets while continuing to meet client expectations. MacKay Sposito, founded in 1974, saw an opportunity to bring on talented staff to grow the company’s expertise and capacity. We are thrilled at the prospect of working together to make this happen.

Office locations

MacKay Sposito will maintain two offices in Vancouver, WA, including our headquarters, as well as locations in Federal Way and Pasco

Contact Us

Mailing Address: 18405 SE Mill Plain Blvd #100, Vancouver, WA 98683

Phone: (360) 693-4555