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STNI

STNISea-Tac Noise.Info

  • Solve for Sea-Tac. Solve for every airport.
  • Since 2016, working to obtain justice for everyone living under the flight path.
  • Less Noise. Cleaner Air. Better Public Health. Compensation.
  • Everything you think you know about the airport is wrong.

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  • 2026-05-26

    Sustainable airport master plan near-term projects state environmental policy act draft environmental impact statement and next steps

    Presentation about the Port of Seattle’s Sustainable Airport Master Plan Near-Term Projects, covering the completed NEPA process and the required SEPA Draft Environmental Impact Statement. The document outlines various airport infrastructure projects including runway improvements, terminal facilities, maintenance facilities, and cargo operations planned for Sea-Tac Airport.
    TagsEnvironmental Impact Statement, Highline Forum, Port Of Seattle, SAMP, SAMP Draft SEPA EIS, Sea-Tac Airport, SEPAFolderHighline Forum 2026
  • 2026-05-26

    Port Of Seattle regular commission meeting agenda, May 26, 2026

    This document is the agenda for the Port of Seattle Regular Commission Meeting held on May 26, 2026, covering routine administrative and business items such as approval of meeting minutes, claims, and several construction and technology contracts. Key action items include authorizations related to the S Concourse Evolution project at Seattle-Tacoma International Airport, a shore power project at Pier 66, and an emergency power scope of work for the Main Terminal Improvement Program. The agenda does not contain any items specifically addressing airport noise policy.
    TagsPort Of Seattle, Port Of Seattle Commission, Sea-Tac Airport, Stephen MetruckFolderMeetings
  • 2026-05-26

    Port Of Seattle commission agenda May 26, 2026 (SAMP/SEPA introduction)

    This is the agenda for the Port of Seattle Commission Regular Meeting held on May 26, 2026, covering a range of port business items including infrastructure projects at Seattle-Tacoma International Airport (SEA). Key topics include the S Concourse Evolution program (authorized up to $300 million), the Main Terminal Improvement Program emergency power design, and a briefing on the Sustainable Airport Master Plan Near-Term Projects Environmental Review, including a SEPA Draft Environmental Impact Statement. The meeting was held both in person at Sea-Tac Airport and virtually via Microsoft Teams.
    TagsEnvironmental Impact Statement, Port Of Seattle, Port Of Seattle Commission, Sustainable Airport Master PlanFolderMeetings
  • 2026-05-26

    Sustainable Airport Master Plan near-term projects: State Environmental Policy Act draft environmental impact statement and next steps

    The Port of Seattle presented a draft Environmental Impact Statement under Washington State's environmental review law (SEPA) for a set of near-term construction projects at Seattle-Tacoma International Airport. The projects, part of the Sustainable Airport Master Plan, include expansions and improvements such as new gates, taxiway extensions, a second terminal, cargo facilities, and roadway upgrades. The presentation outlined the environmental review process and next steps, including public outreach and engagement.
    TagsEnvironmental Impact Statement, NEPA, Port Of Seattle, SAMP, SEPAFolderMeetings
  • 2026-05-22

    SAMP Near-Term Projects Draft EIS: Chapter 1, Introduction and Purpose & Need

    The Port of Seattle is preparing an Environmental Impact Statement (EIS) under Washington State's Environmental Policy Act (SEPA) for 31 near-term construction and improvement projects at Seattle-Tacoma International Airport (SEA). These projects, drawn from the airport's 2018 Sustainable Airport Master Plan, aim to improve passenger facilities, safety, efficiency, and airport access ahead of a projected 2032 completion date. The review follows a completed federal environmental assessment and addresses the region's growing air travel demand while evaluating potential environmental impacts and mitigation measures.
    TagsEnvironmental Impact Statement, NEPA, Port Of Seattle, SAMP, SEPAFolderDraft EIS
  • 2026-05-18

    Request for 90-day extension to SAMP SEPA draft EIS comment period

    The cities of SeaTac, Burien, and Des Moines jointly wrote to the Port of Seattle on May 18, 2026, requesting a 90-day public comment period for the Sustainable Airport Master Plan (SAMP) Draft Environmental Impact Statement. The cities cited the document's technical complexity, overlapping regional demands including 2026 FIFA World Cup preparations, summer scheduling constraints, and unresolved concerns from the prior federal environmental review as reasons more time is needed. The letter was signed by the SEPA Responsible Officials from all three cities and emphasizes that airport-related impacts on noise, air quality, transportation, and public health directly affect their communities.
    TagsCity of Burien, City Of Des Moines, City Of SeaTac, Port Of Seattle, SAMP Draft SEPA EIS, SAMP Four City ILAFolderFour City ILA
  • 634447191 26140442278976531 5191433782839792025 n
    2026-05-08

    It All Adds Up Sea Change – Deploying Underwater Tech To Study How Noise Affects Marine Life

    A Port of Seattle promotional image featuring a dolphin or orca dorsal fin breaking the surface of calm water, with mountains visible in the background. The image promotes the Port's deployment of underwater technology to study how noise affects marine life, under their 'It All Adds Up Sea Change' environmental initiative.
    TagsEnvironment, Marine, Noise, Port Of SeattleFolderMarine
  • Sustainable airport master plan near term projects state environmental policy act draft environmental impact statement and next steps page 13

    SAMP Near-Term Projects SEPA Draft EIS Timeline and Next Steps

    A project timeline slide showing the environmental review process for a Sea-Tac Airport project, currently at the Draft SEPA EIS Publication stage (5/22/26). Key milestones include the Final NEPA FEA & Decision (9/26/25), Draft SEPA EIS Agency & Public Review, Final SEPA EIS & SEPA Decision (Q4 2026), and Commission Action Required for NTP(s) approval in 2027.
    TagsEnvironmental Impact Statement, Port Of Seattle, SAMP, SAMP Draft SEPA EIS, Sea-Tac Airport, SEPA, StARTFolderStART
  • 2026-05-01

    SAMP Near-Term Projects Draft EIS Chapter 5: Cumulative Impacts

    This section of the May 2026 Draft Environmental Impact Statement for Seattle-Tacoma International Airport examines how the airport's near-term construction projects may combine with other past, present, and planned developments to create cumulative environmental effects. The analysis covers 58 projects in the surrounding area—including housing, road improvements, and airport expansions—completed or expected between 2017 and 2032, within a study area defined by the airport grounds, the 65 DNL noise contour, and the surface transportation zone. Long-term airport expansion proposals beyond 2032 are excluded from the analysis because they lack sufficient detail and funding approval to allow meaningful review.
    TagsEnvironmental Impact Statement, Port Of Seattle, SAMP, Sea-Tac Airport, SEPAFolderDraft EIS
  • 2026-05-01

    Appendix L: Surface Transportation (NEPA/SEPA)

    This report analyzes existing traffic conditions around Seattle-Tacoma International Airport as part of the Sustainable Airport Master Plan (SAMP) Near-Term Projects Environmental Review. It examines 108 intersections—including signalized, stop-controlled, and uncontrolled locations—along key travel routes connecting the airport to surrounding communities, focusing on weekday PM peak hour traffic volumes. The study also includes freeway analysis of SR 518 and I-5 ramps and segments at the request of WSDOT.
    TagsNEPA, Port Of Seattle, SAMP, SEPA, Sustainable Airport Master Plan, WSDOTFolderAppendices

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Upcoming Events

  • Burien Airport Committee Meeting September 15, 2026
    Add to CalendarMTuesday Sep 15: 6:00pm
    400 SW 152nd St, Burien, WA 98166
    Burien airport committee 15 sep 2026 agenda pdf pdf

    a) Part 150 Noise Study (Emily Inlow-Hood) — 15 minutes
    b) SAMP Update and Next Steps (Brian Davis and Sarah Moore) — 15 minutes
    c) Legislative Updates — 10 minutes
       • SCA (Sarah Moore)
       • Work with Sen. Orwall (Brian Davis)
    d) StART Reorganization (Jeff Harbaugh and Karen Veloria) — 10 minutes

    [...]

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Issues

Sea-Tac Airport is currently undergoing the largest and longest expansion in its history, collectively known as the Sustainable Airport Master Plan (SAMP). Some of it you can already hear, but you’re probably not aware of what it all means. Here’s what you need to know.
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Read This!

As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.
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