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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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  • 2032 DNL ELU Nrb
    2025-01-01

    2032 DNL Noise Contours with Existing Land Use and Noise Remedy Boundary — Sea-Tac Airport

    This GIS map depicts the 2032 Day-Night Average Sound Level (DNL) noise contours (65, 70, and 75 dB) for Seattle-Tacoma International Airport (SEA), overlaid with generalized land use classifications and the current Noise Remedy Boundary. Sourced from the State of Washington (2024) and SEA SAMP, adapted by ESA in 2025, the map covers surrounding jurisdictions including Burien, SeaTac, Tukwila, Normandy Park, Des Moines, and unincorporated King County.
    TagsLand Use, Map, Noise Countour, Part 150, SAMP, Sea-Tac AirportFolder2024
  • 2024-12-19

    Approval of Noise Compatibility Program Update, Naples Municipal Airport (APF), Naples, Florida

    Action Notice. Summary The Federal Aviation Administration (FAA) announces its findings on the Noise Compatibility Program (NCP) Update submitted by the Naples Airport Authority (NAA) for the Naples Municipal Airport (the Airport). On December 9, 2021, the FAA determined that Noise Exposure Maps (NEMs) submitted by the NAA were in compliance with applicable requirements. The
    CategoriesFrom The Web TagsFAA, Naples, Part 150
  • 2024-12-19

    FAA Approval of Noise Compatibility Program Update, Naples Municipal Airport (APF), Naples, Florida

    The FAA approved a Noise Compatibility Program (NCP) Update for Naples Municipal Airport in Naples, Florida, effective December 9, 2024. The approved measures include a residential sound insulation program, land use planning recommendations, purchase of avigation easements, and several community outreach and monitoring initiatives. One proposed measure related to revised flight procedures was not acted upon at this time, as it requires further FAA review.
    TagsFAA, Federal Register, Naples, Noise Abatement Procedures, Part 150FolderNaples
  • 2024-12-13

    City of Des Moines Letter to Port Of Seattle: Comments on SAMP Draft Environmental Assessment

    The City of Des Moines, Washington submitted formal comments to the Port of Seattle in December 2024, raising concerns about the environmental and health impacts of Seattle-Tacoma International Airport's planned growth. The city warns that by 2032, annual flight operations will increase by nearly 20%, expanding the noise exposure zone and raising the number of residents affected by significant aircraft noise from roughly 14,000 to nearly 22,000—with most of that burden falling on Des Moines residents. The letter calls on the Port and FAA to extend public comment periods, pursue meaningful noise mitigation measures such as sound insulation for homes and schools, and engage more collaboratively with impacted communities rather than treating public review as a formality.
    TagsCity Of Des Moines, NEPA, Part 150, SAMP, SAMP Draft EA, Sustainable Airport Master PlanFolder2024 Comment
  • 2024-12-12

    City of Des Moines Comment Letter on Seattle-Tacoma SAMP Draft Environmental Assessment

    The City of Des Moines submitted formal comments to the Port of Seattle in December 2024, expressing serious concerns about the Seattle-Tacoma International Airport's Sustainable Airport Master Plan and its projected growth in flight operations. The letter warns that by 2032, a nearly 20% increase in annual flights will significantly expand noise exposure for Des Moines residents, with the population affected by harmful noise levels rising by roughly 37% even without the proposed expansion. The city calls on the Port and FAA to extend public review periods, develop meaningful noise mitigation measures such as sound insulation programs, and collaborate more genuinely with neighboring communities rather than treating public input as a regulatory checkbox.
    CategoriesCorrespondence TagsCity Of Des Moines, NEPA, Part 150, SAMP, SAMP Draft EA, Sustainable Airport Master PlanFolder2024 Comment
  • 2024-12-12

    Four-City Joint Comment Letter on Seattle-Tacoma International Airport SAMP Draft Environmental Assessment

    Four cities near Seattle-Tacoma International Airport — Burien, Normandy Park, SeaTac, and Des Moines — submitted formal comments in December 2024 objecting to the airport's Sustainable Airport Master Plan Environmental Assessment. The cities warn that planned growth will increase annual flight operations by nearly 20% by 2032, expanding the noise impact zone and exposing an estimated 22,000 residents to significant aircraft noise, up from about 14,000 in 2022. They call on the Port of Seattle to extend public review periods, improve its sound insulation program, and take proactive steps to protect the low-income and minority communities most burdened by airport noise.
    CategoriesCorrespondence TagsCity of Burien, City Of Des Moines, City of Normandy Park, City Of SeaTac, Environmental Justice, NEPA, Part 150, SAMP, SAMP Draft EA, Sustainable Airport Master PlanFolder2024 Comment
  • SEL and DNL 65 Noise Metrics Educational Slide — Port Of Seattle Part 150 Study

    An educational slide produced by the Port of Seattle for Seattle-Tacoma International Airport explaining aircraft noise metrics, including Single Event Sound Level (SEL), Hourly LEQ, and Day-Night Level (DNL). The slide illustrates how varying numbers of daily flight events (1, 10, or 100) can produce identical DNL 65 noise levels, and includes charts showing sound levels over time periods ranging from seconds to 24 hours.
    TagsDNL65, Noise 101, Part 150, Sea-Tac Airport, StARTFolderStART
  • Part 150 09.24.2013_Commission_Presentation_Page_06

    A Port of Seattle presentation slide titled 'Continuing Programs With Some Modifications' describes modifying Engine Testing Maintenance Run-Up Regulations to include a Ground Run-Up Enclosure (GRE) when built. The accompanying photo shows a FedEx aircraft undergoing engine maintenance outside a hangar at Seattle-Tacoma International Airport.
    TagsPart 150FolderCommission Presentation
  • Part 150 09.24.2013_Commission_Presentation_Page_10

    A Port of Seattle presentation slide titled 'New Measures' outlines four noise-mitigation initiatives: a multi-family tenant-occupied insulation pilot project for apartments, purchase of avigation easements on mobile/manufactured home parcels (pilot project), a feasibility study for sound insulation of churches and places of worship, and establishing feasible locations for a Ground Run-up Enclosure (GRE).
    TagsPart 150FolderCommission Presentation
  • Part 150 09.24.2013_Commission_Presentation_Page_09

    A Port of Seattle presentation slide titled 'Continuing Programs with No Modifications' describes the continuation of a sound insulation program for schools previously identified as eligible in the Highline School District and Highline Community College, as funding permits. The slide includes a construction photo showing workers outside a single-story brick school building undergoing sound insulation work.
    TagsPart 150FolderCommission Presentation

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Upcoming Events

  • Stay Grounded Event: Night trains, not night planes!
    Add to CalendarMSunday Sep 13: 12:00am
    Ntnnp social media3

    For the past two years, more than 220 initiatives from 15 countries have declared September 13th as the International day for the ban of night flights at airports. In parallel, activists across Europe have been gathering for pyjama parties for night trains – coordinated in 2024 and 2025 by Back on Track and Stay Grounded.

    [...]
  • 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

    [...]

[See all...]


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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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