Crews are finishing survey work in the Inglewood Hill area over the next week or so. The next round of field research is planned for summer 2025.

The project team is continuing research as we look at options for new wastewater infrastructure in the East Lake Sammamish area. This new infrastructure will help carry more wastewater from a busy area to a regional treatment plant.

When King County expands the regional system in new locations, our project teams do extensive work behind the scenes and on the ground. This work informs project options and how a project might be built.

We look forward to sharing more information with the community in summer 2025. Watch for email updates and invitations to learn more and give input and feedback.  

Your voice matters as we plan the future of clean water for our Puget Sound region. King County’s Vision for Clean Water sets our clean water goals for our regional wastewater system for the next 75 years.  

Help shape our region’s vision by taking a 15-minute survey at publicinput.com/VisionforCleanWater. 

Visit us at Salmon Days 2025 

Mark your calendars, the Sammamish Plateau Diversion Project team will be at the Issaquah Salmon Days this fall! We will be tabling at this annual event, which takes place on October 4 and 5 in downtown Issaquah. Stop by our booth to meet our team and other work groups in King County’s Department of Natural Resources and Parks. Have fun learning about how we all work to protect our waters for people and salmon!

The Sammamish Plateau project team will be joined by: 

• WTD’s Coal Creek Sewer Upgrade Project - the first project of its kind to get Salmon Safe Certification!
• Our Noxious Weeds team  
• The Floodplain Management Section

Visit the Salmon Days website for more details about the event: www.issaquahchamber.com/salmondays