Over 1,850 clients have trusted us with biological, ecological, and land use consulting.
![Dock karla[1]](https://atsi.biz/wp-content/uploads/Dock_Karla1.jpg)
Build on schedule. Wetland permitting handled. Since 1992.
We help Tribal organizations, municipalities, and property developers delivering projects in Washington State avoid surprises around wetlands, species, and habitat so projects move from concept to occupancy on time and in compliance. We act as your single partner for early‑stage risk and feasibility assessments, End To End Permit & Compliance Management, & Long Term Mitigation Stewardship.
For Tribal Organizations
Secure approvals faster, protect your pro forma, and keep projects on schedule with defensible, full-scope permitting support.Learn moreFor Municipalities
Streamline reviews and ensure defensible, consistent decisions with clear documentation and compliant reporting.Learn moreFor Property Developers
Preserve your view, protect your property value, and navigate local permitting with ease and discretion.Learn more
Environmental Science, Land Use, & Mitigation
Experience That Drives Every Project Forward
For over four decades, ATSI has helped Tribal Organizations, Municipalities, and Property Developers turn complex environmental regulations into clear, achievable outcomes. Our end-to-end approach brings accuracy, efficiency, and accountability to every stage of permitting.

“Tony and his team didn’t back down and worked with me to get a Reasonable Use Permit for the lot when a lot of others told us it was hopeless. I appreciate their diligence and confidence when it comes to tough projects like mine!”
Matthew StrittmatterResidential Client![Dsc 0817 1[1]](data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%201920%201277'%3E%3C/svg%3E)
Trusted Partners in Sustainable Development
A Few Of Our Clients
From local municipalities to national developers, we’re proud to partner with organizations that share our commitment to sustainable growth and environmental responsibility.
See Our PortfolioEnd-To-End Expertise
Our Services
ATSI provides end-to-end consulting services ranging from wetland delineations and mitigation design to long-term monitoring.
Streamlined Permitting
Fast-track approvals with expert guidance through local, state, and federal requirements — from SEPA and JARPA to shoreline and zoning variances.Critical Area Services
Identify, map, and document wetlands, streams, and habitats with precision using detailed fieldwork, OHWM determinations, and defensible reports.Mitigation & Restoration Planning
Design and implement site-specific mitigation strategies that minimize environmental impact and strengthen project approvals.Environmental Monitoring
Ensure compliance with long-term monitoring, site assessments, and performance reports that protect both your project and the environment.Ecological & Habitat Surveys
Conduct specialized studies of wetlands, wildlife, and vegetation to support defensible, data-driven permitting decisions.Expert Consulting
Collaborate with experienced consultants who streamline communication with regulators, manage field data, and keep your project on track.End-to-End Project Support
From concept to occupancy, ATSI provides a single accountable team for risk, surveys, permitting, mitigation, and ongoing maintenance.
Know Your Risks
Get Your Free Wetland Risk Snapshot in 48 Hours
Get a defensible, data-driven summary of your project’s environmental risks within 48 hours — so you can plan confidently and avoid costly surprises before you build.
Hear From Our Clients
Trusted by Clients Across the Pacific Northwest
Our clients rely on us to make complex permitting simple, predictable, and defensible.
“The Aqua-Terr crew have worked twice for me on difficult residential projects. They did great jobs — smart, efficient, and professional. Highly recommend!”

“I’ve had a great experience with Tony. He was professional, friendly, and always willing to assist. Highly recommend ATSI to anyone looking for wetland services.”

“I watched ATSI perform a wetland delineation and they did outstanding work. Great professional company and very helpful with my questions. A+ work!”

“Being new to Washington, we were intimidated by the permitting process. After calling a few places, we were lucky to be referred to Tony. He gave us the information we needed, answered all our questions, and educated us along the way. The land didn’t work out, but now we know exactly who to call next time.”

“Highly detailed, dependable, and professional. I’ve hired ATSI for multiple tasks and am still working with them on some. Bringing them in made my job easier — glad I did!”

“I hired ATSI for a wetland and mitigation project. Tony and the team took care of everything in a quick and thoughtful manner. I wouldn’t hesitate to recommend them or use them again.”

“Tony and his team communicated quickly and effectively. Our assessment didn’t go the way we’d hoped, but not for lack of effort — Tony went above and beyond, even making calls on our behalf. You would do well hiring ATSI.”

“Gianna was great to work with. She reached out to me right away, and the turnaround from her site visit to having my biological site assessment done was quicker than expected.”

“Tony and his team are great. From start to finish, the experience was enjoyable — they did exactly what they said they would, communicated consistently throughout, and delivered on time. It was a pleasure working with you!”

“Before working with ATSI I struggled to get the information I needed for a possible build on my property. After working with them, I received a detailed report exactly when promised, giving me the confidence to propose a plan to the county. The whole team is really into what they do and easy to work with. Thanks for your knowledge and support!”

“We had an excellent experience with Aqua-Terr Systems while assessing wetland conditions during our property hunting process. They were extremely flexible, working with us to tailor the price according to our needs. It was pouring rain the day we scouted, but the team pushed through every mud hole with us. What really impressed us was their honesty — they even refunded us for unused service time and followed up to make sure we received it. Truly awesome service!”

Field-Tested Expertise
See Our Work in Action
From wetland delineations to mitigation design, these field photos showcase the real work behind our permitting and restoration projects across the Pacific Northwest.
Get Started With ATSI
Move Your Project Forward with Confidence
From risk assessments to mitigation and monitoring, ATSI provides end-to-end expertise that helps projects stay compliant, on schedule, and stress-free. Partner with a team that knows how to turn complex regulations into clear next steps.
Contact ATSI Today

![Medaows1[1]](https://atsi.biz/wp-content/uploads/medaows11.jpg)


![Dsc 0817 1[1]](https://atsi.biz/wp-content/uploads/DSC_0817-11.jpg)
![Lcc logo[1]](https://atsi.biz/wp-content/uploads/lcc-logo1.jpg)
![British petroleum logo png seeklogo 471800[1]](https://atsi.biz/wp-content/uploads/british-petroleum-logo-png_seeklogo-4718001.png)
![City of burlington[1]](https://atsi.biz/wp-content/uploads/city-of-burlington1.png)
![Download[1]](https://atsi.biz/wp-content/uploads/download1.png)
![Anacortes logo[1]](https://atsi.biz/wp-content/uploads/Anacortes-Logo1.png)
![Cofcirclogopng transp 2[1]](https://atsi.biz/wp-content/uploads/COFcircLOGOpng-transp-21.png)














![Dsc 0486 2[1]](https://atsi.biz/wp-content/uploads/DSC_0486-21.jpg)


