Lake Tapps is an unincorporated community in Pierce County, Washington. The majority of the area surrounding the reservoir, also known as Lake Tapps, is in unincorporated Pierce County, the rest of the area is the city of Bonney Lake. The northern edge of Lake Tapps is Auburn. The majority of the community is residential.
An agreement with the Lake Tapps homeowners and the owning company of the lake, guarantees full recreational lake levels throughout the summer. It has also signed an agreement with the Muckleshoot Indian Tribe and the Puyallup Tribe of Indians to ensure instream flows for fish. The four cities that surround the lake, Auburn, Bonney Lake, Buckley and Sumner, worked with Cascade to ensure their future water needs will be met for about 50 years. Cascade is the operator of Lake Tapps.
Lake Tapps is about 4.5 square miles in surface area and has about 45 miles of shoreline. The local terrain is such that the shape of the shoreline is very complex, with many inlets, peninsulas, and islands.