Noise programs briefing

This 2020 Port of Seattle briefing document outlines the status of Sea-Tac Airport's sound insulation program, which has treated approximately 9,400 homes at a cost of $300 million since 1985, while roughly 1,176 residential units remain eligible but untreated. Staff proposed accelerating the remaining work—covering single-family homes, condominiums, apartments, and places of worship—ahead of the current 5-year Capital Improvement Plan schedule, at an estimated cost of $132–$227 million. Key risks include uncertain FAA grant funding, contractor availability, and potential airline opposition through majority-in-interest provisions.

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This briefing memorandum informs the Port of Seattle Commission about ongoing airport sound insulation and noise programs at Sea-Tac Airport, and proposes accelerating sound insulation work approved through the 2014 Part 150 Study update but not yet in the 5-year Capital Improvement Program. The document outlines remaining projects including single-family homes, condominiums, apartment complexes, places of worship, and voluntary acquisitions, with estimated costs ranging from $132 million to $259 million depending on pace. Key risks include uncertain FAA AIP grant funding, staffing challenges, contractor availability, and potential airline majority-in-interest review.

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