TagSea-Tac Airport(1855)

The National Marine Fisheries Service (NMFS) issued a Biological Opinion on July 28, 2025, in response to a Federal Aviation Administration (FAA) consultation request regarding the Seattle-Tacoma International Airport Sustainable Airport Master Plan Near-Term Projects. The opinion evaluates potential effects of the planned airport projects on endangered species and critical fish habitat under the Endangered Species Act and the Magnuson-Stevens Fishery Conservation and Management Act. The review drew on a Final Biological Evaluation prepared by the FAA to assess impacts on species status, critical habitat, and the surrounding environment.

The National Marine Fisheries Service (NMFS) issued a Biological Opinion on July 28, 2025, in response to a Federal Aviation Administration consultation request regarding near-term construction projects outlined in the Seattle-Tacoma International Airport Sustainable Airport Master Plan. The opinion evaluates potential effects of these projects on endangered species and critical fish habitat under the Endangered Species Act and the Magnuson-Stevens Fishery Conservation and Management Act. NMFS reviewed and independently verified analyses from the FAA's Biological Evaluation, incorporating findings related to the proposed action area, species status, and effects on critical habitat.

Harris Miller Miller & Hanson Inc. (HMMH) conducted sound insulation measurements at 30 homes near Seattle-Tacoma International Airport in June 2025 to determine whether interior noise levels meet the federal threshold for sound insulation assistance. Using FAA-approved testing methods, the study found that only 3 of the 30 homes had median interior Day-Night Average Sound Levels (DNL) at or above the qualifying 45 dB threshold, while an additional 3 homes had individual rooms exceeding that level. The results inform eligibility decisions under the SEA Repair and Replacement Program, which is governed by FAA Advisory Circular 150/5000-9B and the Airport Improvement Program Handbook.

The Port of Seattle's Q2 2025 Financial Performance Report, covering the period through June 30, 2025, shows Seattle-Tacoma International Airport (SEA) passenger volume running 1.6% above the same period in 2024, with approximately 53.1 million passengers projected for the full year. Portwide operating revenues came in $1.2 million above budget while operating expenses ran $12.8 million below budget, resulting in a net operating income before depreciation of $14.0 million above budget. The report covers financial results across the Aviation, Maritime, Economic Development, and Central Services divisions.

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.

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.