Making Sustainability Possible:

Since 1982

Environmental Science, Land Use, & Mitigation 

Environmental Science

Discover comprehensive solutions in Wetland Management, Shoreline Protection, Habitat Conservation, and Storm Water Inspections with our team of experts. We combine cutting-edge techniques with years of experience to ensure sustainable results, help you meet regulatory requirements, and foster harmonious interactions between human activities and the environment. Your stewardship goals are our mission.

Land Use

Elevate your project potential with our top-tier services in Feasibility Analysis, Permit Acquisition, Expert Project Management, and Certified Erosion Sediment Control Lead (CESCL) inspection. We provide unmatched insight, streamlined permit processing, meticulous management, and environmental stewardship, ensuring your projects succeed while maintaining eco-conscious standards. Let our expertise be the catalyst for your project’s success.


Optimize your mitigation project with our end-to-end services spanning expert Planting, precise Installation, rigorous Monitoring, proactive Maintenance, and comprehensive Stormwater Inspections. We offer a dedicated, specialist approach to foster thriving ecosystems, ensure regulatory compliance, and drive sustainable success. Experience unparalleled project enhancement with our skilled team supporting every step of your journey.

What some of our great clients have to say about us

The team at ATSI is great to work with and they have done a very detailed and professional job. Karla is extremely experienced in this field.

– Jason Ragsdale, Pres.

ATSI has a staff of hard-working professionals who bring expertise and dedication to their jobs. They are a pleasure to work with and can always be relied upon to do an excellent job.

– Board of Directors



With a legacy since 1988, we’ve successfully served 1,750+ clients across 40,500+ acres of public/private land, navigating biological permitting and consultation at all levels. We expertly handle diverse project sizes, from tracts exceeding 1,000 acres to parcels under 1 acre, across commercial, residential, and public facilities.

Our expansive reach spans Whatcom, Skagit, Island, San Juan, Snohomish, and King counties, with clients in Washington, Alaska, and Canada. We offer specialist consulting to numerous local jurisdictions, state and federal agencies, and sovereign nations, including the Upper Skagit, Nooksack, and Lummi Native Tribes. Trust us for unmatched proficiency in biological critical area assessment.


“Even the term captures our awkwardness or conflict as we combine two of the earth’s most powerful core elements: water and land. Los in our new scientific jargon are the unique fens, marshes, bogs, and swamps that reflects our historical connection with each individual site; each site with unique function and contribution o the hydrological cycle. The universal term of “wetlands” too often leads to over-simplification of the complexity of each dynamic place where water and land are one” ~1998 Stewardship Management Plan