August 28, 2026

Housing & Human Services Background Report Appendices: Appendix C — HAP Report, Housing Inventory & Assessment Report (HIAR) Including Sea-Tac Displacement Risk Assessment

This document is an appendix to the City of SeaTac's Housing and Human Services Background Report, specifically containing a Housing Inventory and Assessment Report (HIAR) along with a SeaTac Displacement Risk Assessment. It examines the local housing landscape, evaluating existing housing stock and identifying populations at risk of displacement within the city. The report serves as a planning resource to inform SeaTac's Comprehensive Plan policies related to housing and human services.

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Cover/divider page for Appendix C of the Housing & Human Services Background Report Appendices for the City of SeaTac Comprehensive Plan. Contains the HAP Report — Housing Inventory & Assessment Report (HIAR), which includes the SeaTac Displacement Risk Assessment. Document identifier PRR26-564, page reference 001181, filed as HHS-BR-40.

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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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