Wastewater Comprehensive Plan

2022 Wastewater Comprehensive Plan

On March 6, 2023, the Sammamish Plateau Water & Sewer District Board of Commissioners adopted the 2022 Final Wastewater Comprehensive Plan for Public Distribution (2022 Plan). The 2022 Plan is comprehensive, providing a long-term strategy and road map for the district’s sewer utility over the 6-year and 20-year planning periods. The Plan analyzes methods for provision of effective and efficient sewer service to existing sewer customers and approaches to expand sewer service to properties within the District’s urban sewer service area that do not currently have sewer service available.

The 2022 Plan as adopted on March 6, 2023 is available here.

2022 Final Wastewater Comprehensive Plan and General Sewer Plan

Appendices to the 2022 Final Wastewater Comprehensive Plan and General Sewer Plan

Please note: Some of these files are large and may take several minutes to download. We appreciate your patience!

Sewer Basin Maps

The basin plan figures included in Chapter 7 of the 2022 Wastewater Comprehensive Plan show the existing sewer system as well as a conceptual layout of the future sewer system. The future locations are intended for planning purposes, and the exact locations of future sewers will be based on detailed engineering.

Figure 1-14: 2022 Major Sewer Subbasins (PDF)

Figure 7-1: Northeast Plateau (PDF)

Figure 7-2: Beaver Dam (PDF)

Figure 7-3: Inglewood East (PDF)

Figure 7-4: Tiburon (PDF)

Figure 7-5: North Lake Sammamish (PDF)

Figure 7-6: Central Lake Sammamish (PDF)

Figure 7-7: Mallard Bay (PDF)

Figure 7-8: Trossachs (PDF)

Figure 7-9: Yellow Lake (PDF)

Figure 7-10: North Sunnyhills (PDF)

Figure 7-11: Laughing Jacobs (PDF)