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This 2009 fact sheet from Washington State's Department of Ecology documents the proposed National Pollutant Discharge Elimination System (NPDES) permit for Seattle-Tacoma International Airport, outlining where and how the airport is allowed to discharge industrial wastewater and stormwater into nearby water bodies, including Puget Sound, Miller Creek, Lake Reba, and Des Moines Creek. The permit sets limits on the types and amounts of pollutants the airport may release, based on available treatment technology and the health of the receiving waters. It also details the public comment process and the airport's plans to modify or eliminate certain discharge outfalls as part of ongoing construction projects, including a third runway expansion.

Seattle-Tacoma International Airport's 2009 Environmental Strategy Plan outlines a long-term vision for sustainable airport operations through 2014 and beyond, covering key areas such as air quality, energy conservation, noise reduction, water resources, and recycling. The plan, developed by the Port of Seattle, sets measurable goals and a five-year technical work plan to reduce the airport's environmental footprint while supporting the surrounding community. Noise management is addressed as part of a broader commitment to promoting sustainable communities near the airport.

Resolution No. 3583 is a Port of Seattle Port Commission resolution adopted on September 11, 2007, that updates and strengthens the Code of Ethics governing Port Commissioners. It establishes standards of conduct covering conflicts of interest, acceptance of gifts, financial disclosures, and rules for former commissioners, while repealing the previous ethics resolution (No. 3295). The resolution also authorizes the Chief Executive Officer to publish the updated code and align the employee ethics policy accordingly.