The Port of Seattle released a Draft Environmental Impact Statement (DEIS) under the State Environmental Policy Act (SEPA) for the Sustainable Airport Master Plan Near-Term Projects at Sea-Tac Airport, finding that surface transportation is the only category with significant impacts requiring mitigation. The review examined sixteen environmental categories including noise, air quality, and community impacts, with a 60-day public comment period running from May 22 to July 21, 2026, including in-person meetings in SeaTac, Burien, Des Moines, and Federal Way. A final SEPA determination is expected by the end of 2026.Open full document
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This Commission agenda memorandum briefing provides an overview of the SEPA Draft Environmental Impact Statement (DEIS) findings for the Sustainable Airport Master Plan (SAMP) Near-Term Projects, to be published May 22, 2026. The DEIS evaluated sixteen environmental resource categories, identifying significant but mitigable impacts to surface transportation. The briefing also outlines a 60-day public comment period (May 22–July 21, 2026) with four in-person public meetings and two virtual meetings, with the SEPA Final EIS anticipated by end of 2026.