Interlocal agreements

View current interlocal agreements between our City and other government agencies.

About interlocal agreements

We work with other cities and agencies through shared agreements. These agreements help our City and our partners work together, share resources and avoid doing the same work twice.

The agreements cover topics such as saving resources, managing floods and handling solid waste. They help improve services and make coordination easier for everyone involved. 

List of interlocal agreements

Below are links to each interlocal agreement (ILA) we've entered.

Agreement number Title Ending date
90-A021/ 1021(PDF, 2MB) Agreement with King County for solid waste management Ongoing
90-A022/ 1022(PDF, 648KB) Agreement with King County for provision of road services Ongoing
90-A033/ 1033(PDF, 155KB) Agreement with Southwest Suburban Sewer District to provide sanitary sewer service Ongoing
90-A037/ 1037(PDF, 908KB) Agreement with Puget Sound Council on Government to offer our city membership into the association Ongoing
92-A186/ 1186(PDF, 480KB) ILA forming a Growth Management Planning Council (GMPC) with King County, Seattle and suburban cities and towns of King County Ongoing
93-A125/ 1251 ILA for regional planning of the Central Puget Sound Area between counties, cities, and towns, political subdivisions and municipal corporation of the State of Washington and federally funded Indian tribes Ongoing
97-A120(PDF, 248KB) ILA with King County for the licensing of taxicabs/for-hire vehicles and drivers Ongoing
00-A097(PDF, 53MB) ILA with King County for law enforcement services Ongoing
03-A090(PDF, 451KB) Interlocal Cooperative Agreement with other jurisdictions in King County to provide law enforcement mutual aid and mobilization Ongoing
03-A121(PDF, 59MB) ILA with the City of Burien, City of Des Moines, the City of Normandy Park, and King County for the maintenance and preservation of Des Moines Memorial Drive Ongoing
04-A036(PDF, 4MB) ILA with Des Moines, the Port of Seattle, the Washington State Department of Transportation (WSDOT) for the Des Moines Creek Basin Restoration Projects Ongoing
06-A091(PDF, 323KB) ILA with Highline Water District for cross connection control Ongoing
07-A101(PDF, 305KB) ILA for electrical inspection services with the City of Tukwila
07-A115(PDF, 511KB) ILA with Highline School District 401 for city recreation room at Bow Lake Elementary School Ongoing
08-A110(PDF, 227KB) ILA with Highline School District 401 regarding installation agreement for Madrona Elementary School walking path July 1, 2033
09-A105(PDF, 495KB) Interlocal Operating Agreement with Sound Transit regarding funding contributions for D'Agostino artwork
09-A012(PDF, 3MB) ILA with the South Correctional Entity (SCORE) to establish and maintain a consolidated correctional facility Ongoing
12-A090(PDF, 465KB) ILA between Cities of Auburn, Bainbridge Island, Bellevue, Burlington, Des Moines, Everett, Issaquah, Kent, Mt. Vernon, Renton, SeaTac, Snoqualmie, Sumner and Cowlitz County to pay for the legal services of Foster Pepper PLLC — Letter of engagement for National Pollution Discharge Elimination System (NPDES) Phase II appeal Ongoing
12-A120(PDF, 1MB) ILA with Coalition of Government Entities regarding legal services for the NPDES Phase II permits Ongoing
13-A148(PDF, 12MB) ILA with Kent Fire Department Regional Fire Authority (RFA) to provide fire protection, fire suppression, and emergency medical services December 31, 2033
13-A176(PDF, 723KB) ILA with Des Moines, Covington, and Tukwila for planning, funding, and implementation of a Joint Minor Home Repair Program Ongoing
14-A062(PDF, 871KB) ILA for the joint establishment of a Tourism Promotion Area with Tukwila and Des Moines May 5, 2034
14-A158(PDF, 4MB) Interagency agreement with King County to design, construct, operate, and maintain Lake to Sound Trail, Segment B, within city boundaries Ongoing
15-A178(PDF, 1MB) ILA with King County for use of electronic fingerprint capture equipment Ongoing
15-A191(PDF, 2MB) ILA — Green River, Duwamish River and Central Puget Sound Watersheds within the geographic planning area of Water Resource Inventory Area 9 (WRIA9) July 19, 2025
17-A094(PDF, 7MB) ILA with Regional Animal Services of King County (RASKC) December 31, 2027
17-A105(PDF, 2MB) ILA Cities Insurance Association of Washington Ongoing
18-A001(PDF, 10MB) 2018 ILA with the Port of Seattle February 17, 2028
18-A039(PDF, 1MB) ILA between the Cities of Burien, Des Moines, Normandy Park and SeaTac for environmental review of the SeaTac Airport Sustainable Airport Master Plan December 31, 2023
18-A144(PDF, 3MB) ILA with WSDOT for shared funding for construction of the Puget Sound Gateway Program (SR 509 extension) Ongoing
19-A024(PDF, 732KB) 2019–2023 ILA for Waterfowl (Canada Goose) Management Program December 31, 2023
19-A105(PDF, 1MB) Memorandum of understanding related to the ILA for law enforcement services (00-A097) regarding our city's selection of our police chief Ongoing
19-A181(PDF, 10MB) ILA Burien–Des Moines–Normandy Park–SeaTac–King County for Stormfest December 31, 2024
20-A074(PDF, 6MB) ILA with Burien — Construct the Miller Creek Stream Realignment — Daylighting Project December 31, 2022
20-A110(PDF, 9MB) ILA with King County to accept partial grant for acquiring WSDOT property Ongoing
21-A103(PDF, 1MB) ILA with Highline Water District — Construction of water distribution infrastructure January 31, 2023
21-A105(PDF, 913KB) ILA with the Port of Seattle Police regarding prosecutorial services January 31, 2024
22-A011(PDF, 2MB) ILA with WSDOT — SR 509 Completion Project — South 208th Street Connector improvements Ongoing
22-A024(PDF, 373KB) ILA for electrical inspection services with Tukwila Ongoing
22-A048(PDF, 1006KB) ILA with Association of Washington Cities (AWC) Employment Benefit Trust Health Care Program Ongoing
22-A074(PDF, 1MB) ILA with Federal Way — Commute Trip Reduction implementation Ongoing
22-A102(PDF, 405KB) ILA with WSDOT — Building South 204th Street as part of SR 509 mitigation Ongoing
23-A009(PDF, 435KB) Temporary ILA with the City of Normandy Park for electrical inspection services August 1, 2023
23-A098(PDF, 631KB) ILA with City of Tukwila for SeaTac Public Works fleet maintenance December 31, 2033
24-A031(PDF, 611KB) ILA Waterfowl (Canada Goose) Management Program December 31, 2028