The draft State Environmental Policy Act (SEPA) Environmental Impact Statement (EIS) for the Port of Seattle’s Sustainable Airport Master Plan (SAMP) for Seattle-Tacoma International Airport (SEA) will be available for public comment starting May 22, 2026.
The EIS is a crucial step in the SEPA process, helping SEA assess potential environmental effects of proposed actions and hear from the people who use, work at, and live near the airport.
The Puget Sound region is projected to grow by another one million people by 2035. To accommodate this growth and align with the Port’s sustainability goals, SAMP will serve as SEA’s strategic blueprint for future development. This plan includes 31 near-term projects, including a second terminal, an elevated busway, and new cargo facilities.
Details about the SEPA process, proposed projects, and how to submit public comment are available on the SAMP website. The public comment period will begin May 22, 2026. Once the comment period begins, official comments can be submitted by email, mail, at one of the virtual and in-person meetings hosted by SEA, or on the SAMP website.
SEA by the numbers
- 52.7 million passengers in 2025
- 37 airlines
- 96 nonstop domestic and 36 international destinations
- More than 24,000 people from over 350 companies work at the airport, making SEA the fifth-largest employment site in King County
- Activity at SEA supported nearly 175,000 overall jobs in 2023, $20.5 billion in wages and benefits for those jobs, and over $53 billion in sales and services for customers
Key projects in the master plan
- Building a second terminal with 19 more gates, reducing crowding, ensuring more on-time flights and generating additional jobs
- Making airfield updates to improve safety and efficiency
- Improving airport roads
- Linking the rental car facility and airport terminals
- Investing $40 million in roads surrounding the airport, easing congestion for our neighbors
Contact
Perry Cooper | SEA Airport
(206) 787-4923 | [email protected]
