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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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  • 2025-06-26

    Environmental checklist: Seattle-Tacoma International Airport (SEA) Industrial Wastewater Treatment Plant (IWTP) Enhancement Project

    The Port of Seattle is proposing upgrades to Seattle-Tacoma International Airport's Industrial Wastewater Treatment Plant (IWTP) to better handle wastewater from aircraft deicing operations, with construction planned from 2026 to 2030. The project involves replacing aging treatment equipment at the existing facility and building a new aerated gravel bed (AGB) treatment system on a 10.6-acre site nearby to process high levels of biochemical oxygen demand (BOD) on-site. These upgrades are required to comply with tightening discharge limits set by King County and state environmental permits.
    TagsDeicing, NEPA, Port Of Seattle, Sea-Tac Airport, SEPA, Water QualityFolderSea-Tac Airport
  • Recommended Noise Remedy Boundary Map — Sea-Tac Airport Part 150 Study

    This map, prepared by Landrum & Brown for the Port of Seattle's 14 CFR Part 150 Study at Seattle-Tacoma International Airport, shows the Recommended Noise Remedy Boundary (blue dashed line) alongside the Existing Remedy Boundary (black dashed line) and the Future (2018) NEM/NCP 65 DNL Noise Exposure Contour. The future noise contour covers 7.3 square miles, encompassing an estimated 3,771 housing units, 9,712 residents, and 9 noise-sensitive facilities in communities including Des Moines, Burien, SeaTac, Normandy Park, and Tukwila.
    TagsLandrum & Brown, Map, Noise Boundary, Part 150, Sea-Tac AirportFolderPart 150
  • 2025-06-24

    Port Of Seattle regular commission meeting agenda, June 24, 2025

    The Port of Seattle Commission held its regular meeting on June 24, 2025, covering a range of business items including airport infrastructure projects at Seattle-Tacoma International Airport. Of particular relevance to noise policy, the Commission considered authorizing a $250,000 contract with Maritime Blue for the Quiet Sound Program, a noise-reduction initiative that had been postponed from a May 2025 meeting. The agenda also included approval of capital improvement projects and routine financial obligations for the port.
    TagsPort Of Seattle, Port Of Seattle Commission, Quiet Skies Puget Sound, Sea-Tac AirportFolderMeetings
  • International Arrivals Facility IAF Sky Bridge

    The image shows the airside tarmac at Seattle-Tacoma International Airport (Sea-Tac), featuring a Delta Air Lines aircraft tail (registration 3406, with distinctive red and blue livery) in the foreground and United Airlines aircraft at gates in the background. The airport's elevated pedestrian connector bridge and terminal facade are visible, along with ground crew personnel and equipment on the ramp.
    Tagsaircraft, IAF, International Arrivals Facility, Sea-Tac AirportFolderTerminal
  • 2025-06-16

    Arborist Report: Port Of Seattle Industrial Wastewater Treatment Plan – AGB Site, Sea-Tac, WA

    A June 2025 arborist report by Tree Solutions Inc. inventoried and assessed 181 trees across ten Port of Seattle parcels at the AGB Site near SeaTac Airport, finding the site largely dominated by red alders, black cottonwoods, and invasive plant species following demolition of previous buildings. The report identifies one notable high-value western redcedar (Tree 470, 31.8 inches in diameter) and outlines tree replacement requirements under Port of Seattle Resolution 3821, which mandates a 4-to-1 replacement ratio for any regulated trees removed during future construction. The report is preliminary, as no design or construction plans had been reviewed at the time of writing.
    TagsEnvironment, Port Of Seattle, Sea-Tac Airport, TreesFolderGrid
  • Stia 2404 draft arborist report hbb sea iwtp 2025.06.18 pdf
    2025-06-16

    Arborist Report: Port Of Seattle Industrial Wastewater Treatment Plan – AGB Site, Sea-Tac, WA

    A June 2025 arborist report by Tree Solutions Inc. inventoried and assessed 181 trees across ten Port of Seattle parcels at the AGB Site near SeaTac Airport, finding the site largely dominated by red alders, black cottonwoods, and invasive plant species following demolition of previous buildings. The report identifies one notable high-value western redcedar (Tree 470, 31.8 inches in diameter) and outlines tree replacement requirements under Port of Seattle Resolution 3821, which mandates a 4-to-1 replacement ratio for any regulated trees removed during future construction. The report is preliminary, as no design or construction plans had been reviewed at the time of writing.
    TagsEnvironment, Port Of Seattle, Sea-Tac Airport, TreesFolderGrid
  • 2025-06-14

    June 14: Aircraft Incident

    Incident updates related to an aircraft on the runway at Seattle-Tacoma International Airport (SEA). Updates will be posted to this page as they become available. Updates June 14, 2025, 3:19 p.m. Runway 16R is expected to reopen shortly and SEA Airport will return to normal operations. Please continue to check in with your airline about
    CategoriesFrom The Web TagsSea-Tac Airport, Security, Travel Alert
  • 2025-06-14

    Airport Control Tower and Horizon Alaska Air Flight #2123 evacuation

    An Alaska Airlines aircraft tail fin with the carrier's distinctive Eskimo logo is visible at right, alongside an air traffic control tower at left. A group of people, including individuals with a dog and wearing high-visibility vests, walk along what appears to be an airport perimeter area.
    TagsAir Traffic Control, aircraft, Alaska Air, FAA Occurrences, Sea-Tac AirportFolderAirlines
  • 2025-06-14

    Threat aboard plane halts flights at Sea-Tac Airport; 1 in custody

    By Lauren Girgis and Paige Cornwell Seattle Times staff reporters The Federal Aviation Administration issued a ground stop for Seattle-Tacoma International Airport on Saturday afternoon because of a security threat on a plane bound for Walla Walla. Around 1 p.m., flights scheduled to arrive at Sea-Tac were circling or being diverted to other airports, according
    CategoriesFrom The Web, News Stories TagsSea-Tac Airport, Seattle Times, Security
  • 2025-06-12

    The summer travel season is ramping up — but many airlines are cutting back

    Americans appear to be bracing for economic uncertainty, and the demand for leisure travel is tracking the decline in consumer confidence. Getty Images | Izabela Habur By Joanne Drilling – National Data Reporter, The Business Journals Jun 12, 2025 Listen to this article5 min Story Highlights Airlines trim summer schedules because of economic uncertainty. Spirit, JetBlue, WestJet
    CategoriesFrom The Web, News Stories TagsPuget Sound Business Journal, Sea-Tac Airport

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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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    "EXH AR046005: Draft Memorandum — Methods and Results of Liquefaction Analyses, Third Runway Embankment, Sea-Tac, Washington" — , 2000

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