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| Cedar River Water & Sewer District |
| City of Algona |
| City of Auburn |
| City of Black Diamond |
| City of Burien |
| City of Carnation |
| City of Clyde Hill |
| City of Covington |
| City of Des Moines |
| City of Duvall |
| City of Enumclaw |
| City of Federal Way |
| City of Lake Forest Park |
| City of Maple Valley |
| City of Medina |
| City of Newcastle |
| City of Normandy Park |
| City of North Bend |
| City of Pacific |
| City of SeaTac |
| City of Snoqualmie |
| City of Tukwila |
| Coal Creek Utility District |
| Des Moines Pool Metropolitan Park District |
| Duvall-King County Fire District 45 |
| Eastside Fire & Rescue |
| Highlands Sewer District |
| Highline Water District |
| Kent Fire Department Regional Fire Authority |
| King Conservation District |
| King County Fire District No. 2 |
| King County Fire Protection District #34 |
| King County Fire Protection District #44 |
| King County Fire Protection District #47 |
| King County Housing Authority |
| King County Water District #117 |
| King County Water District #90 |
| King County Water District No. 111 |
| King County Water District No. 45 |
| King County Water District No. 54 |
| Lake Washington School District #414 |
| Mercer Island School District #400 |
| Midway Sewer District |
| Northshore Fire Department |
| Northshore Utility District |
| Puget Sound Educational Service District #121 |
| Renton School District |
| Ronald Wastewater District |
| Seattle Housing Authority |
| Shoreline School District |
| Shoreline Water District |
| Si View Metropolitan Park District |
| Skyway Water & Sewer District |
| Snoqualmie Pass Utility District |
| Town of Beaux Arts Village |
| Town of Hunts Point |
| Town of Skykomish |
| Town of Yarrow Point |
| Tukwila School District No. 406 |
| Valley Regional Fire Authority |
| Vashon Island School District |
| Vashon Sewer District |
| Woodinville Water District |