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Port of Seattle and City of SeaTac Proposed Interlocal Agreement

A partnership for mutual success

The Port of Seattle and the City of SeaTac have released a proposed interlocal agreement (ILA) to move the community and the region forward. As Seattle-Tacoma International Airport continues to serve regional demand, the new ten-year agreement establishes benefits for city residents and businesses, and supports the continued operation of the nation’s ninth-busiest airport.

The proposal continues the partnership between the Port and the City which began in 1997 and, if adopted, will replace the current agreement, which expires early in 2018.

Sea-Tac Airport sign on International Blvd. in SeaTac

Port of Seattle logoCity of SeaTac logo

Sea-Tac Airport is located entirely within the City of SeaTac boundaries, covering over 40 percent of the city’s land area. The ILA addresses the overlapping statutory authority between the City and the Port concerning such issues as planning, land use and zoning, transportation, surface water management, critical environmental areas and public safety.

Sea-Tac Airport served over 45 million passengers and more than 366,000 metric tons of air cargo in 2016, making an ILA critical to the successful operation of the airport and the efficient and timely completion of projects to address operations and the traveler experience.

New or enhanced elements in the proposed ILA include:

  • Support for public safety and traffic enforcement
  • Support of traffic impact fees, permit fees and stormwater fees for Port-owned property
  • Unique land use and development regulations that meet the needs of both the Port and the City
  • Quality assurance for Port development permits integrated into the City system, and
  • A process for the Port to further support City business license compliance

Why an Interlocal Agreement (ILA)?

The purpose of the ILA is to jointly establish a mutual and cooperative system to recognize respective jurisdictional authorities and to avoid disputes. It provides transparency, predictability and consistency when addressing operations of Sea-Tac Airport and the City of SeaTac, and reduces the potential for litigation between the Port and the City.


Next steps:

Learn more by attending and/or viewing the following public meetings. Public comment will be accepted at all Port of Seattle Commission and City of SeaTac Council meeting. 

Date and Time ​Public Meeting ​Location
​Nov. 14  |  1 p.m. Port of Seattle Commission Meeting – Staff Briefing

Watch online here

​Nov. 14  |  5 p.m. ​City of SeaTac Council Study Session – Staff Briefing

Watch online here

Nov. 16
4:30 - 7:30 p.m.
​Joint Open House See documents under
"Resources" above
​Nov. 28  |  7 p.m. City of SeaTac Council Regular Meeting

Watch online here

​Nov. 28  |  1 p.m. Port of Seattle Commission Meeting – Action Item /
1st Reading
Watch online here
​Dec. 12  |  1 p.m. ​Port of Seattle Commission Meeting – Action Item /
2nd Reading

Port of Seattle Headquarters
at Pier 69
2711 Alaskan Way
Seattle, WA 98121

Watch online here

​Dec. 12  |  6 p.m. ​City of SeaTac Council Regular Meeting

​SeaTac City Hall
4800 S. 188th St.
SeaTac, WA 98188

Watch online here

Questions or comments?

Please direct all Port-related questions or comments on the proposed ILA with the City of SeaTac to

Please direct all City-related questions or comments on the proposed ILA to 

All written comments received by December 5th will be mutually shared with the Port of Seattle Commission and the SeaTac City Council prior to final action.