The Midway Sewer District and the Port of Seattle entered into a 10-year Sewer Services Agreement in February 2025, replacing a previous agreement that dated back to 1995. The deal transfers ownership and maintenance of the Airport Industrial Waste Line—a sewer conduit serving Seattle-Tacoma International Airport's airfield—from Midway to the Port, while establishing new discharge limits and a monthly fee of $4,000 for the Port's use of Midway's system. The agreement also addresses a capital contribution from the Port related to upgrades Midway made to its outfall infrastructure in 2007 to handle excess discharge volumes from the Airport.Open full document
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A sewer services agreement between Midway Sewer District and the Port of Seattle establishing terms for continued sewer service to Seattle-Tacoma International Airport. The agreement covers the transfer of ownership and maintenance responsibilities for the Airport Industrial Waste Line from Midway to the Port, sets effluent discharge capacity limits of 3,200 GPM, and establishes a monthly charge of $4,000 for discharge rights. It also addresses the Port’s obligation to contribute capital toward Midway’s 2007 outfall upgrade necessitated in part by the Port’s prior excess discharges.