Federal Way updates strategy on Port of Seattle airport master plan; noise and air pollution highlighted

City staff updated the committee on Federal Way’s response to the Port of Seattle’s substantial master‑plan process for Seattle‑Tacoma International Airport and outlined next steps in a three‑part review (federal, state/SEPA, Port commission).

Assistant/Director (presenter) summarized that the federal review phase is complete and the state environmental review (SEPA) and state comment period will follow, likely in spring, with the Port Commission review later in the year. Staff said the city had submitted comments by the Dec. 13 deadline and that the city expects to receive formal written responses to those comments. Staff highlighted local concerns: projected increases in flights and passenger volumes, the effect of altered descent/arrival angles on neighborhoods (including Marine Hills and Steele Lake areas), increased noise frequency (not just day‑night averages), and potential ultrafine particulate emissions affecting schools and residences.

Why it matters: Changes to flight paths and aircraft operations can alter noise exposure and air quality in communities under flight paths. Staff said they will continue to press for mitigation, seek state and Port funding/partnerships for mitigation measures, and advocate for changes to federal metrics that better account for noise frequency.

Next steps: Staff plans additional analysis as the SEPA document is released (anticipated April–June), to request a public meeting in Federal Way, to coordinate with regional partners and legislators, and to mobilize public input to the Port Commission later in the review process.