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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.
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  • For Municipalities

    Streamline reviews and ensure defensible, consistent decisions with clear documentation and compliant reporting.
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  • For 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.

  • Atsi restoration work
    • “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 Strittmatter
      Residential Client
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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 Portfolio

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.

Added Bonus: Get immediate access to our Three Wetland Permitting Mistakes To Avoid eBook guide.
  • Risk Snapshot Sample (2)
  • Wetland Forecast Snapshot (1)
  • List Of Migratory Birds Snapshot (1)

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!”

    Barbara
    Barbara
  • “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.”

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

    Leo
    Leo Spencer
  • “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.”

    Karla
    Karla Sicairos
  • “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!”

    Miles
    Miles Walz-Salvador
  • “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.”

    Monte
    Monte Young
  • “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.”

    Yvette
    Yvette Ray
  • “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.”

    Grace
    Grace Henden
  • “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!”

    Jordan
    Jordan White-Frisbee
  • “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!”

    Connie perez
    Connie Perez
  • “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!”

    Zoey
    Zoey Tian

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
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