24/7 Biohazard and Crime Scene Cleanup in Sudden Valley, WA

Sudden Valley is an unincorporated census-designated place (CDP) in Whatcom County, Washington, set in forested hills on the south shore of Lake Whatcom, just outside Bellingham.

Rather than a city government, Sudden Valley is run by the Sudden Valley Community Association, one of the largest homeowner associations in western Washington, which owns the community's roads, parks, greenbelts, marina, airstrip, and country club.

The land was a property called 'the Ranch' from 1949, when Glen and Betty Corning bought it, until 1968, when they sold 1,200 acres for $1.8 million to Ken Sanwick of Sudden Valley Inc.

Sanwick marketed the project as a 'Sudden Valley Undevelopment' meant to tuck homes into the wilderness; the county approved the first 158-lot plan in 1969, and the first lot was bought by Mae Schatz in May of that year.

After a series of developer changes and a bankruptcy, ownership and control of Sudden Valley passed to the newly formed Community Association in December 1976.

The community's amenities include an 18-hole golf course designed by architect Ted Robinson, a marina on Lake Whatcom, swimming pools, a fitness center, a library, and miles of hiking trails, including the Lookout Mountain Preserve with its Rufus Creek Falls.

The 2020 census counted 6,354 residents in Sudden Valley, slightly down from 6,441 in 2010 but well up from 4,165 residents in 2000, when the CDP had 1,675 households.

Sudden Valley covers about 8.1 square miles in total, of which roughly 6.2 square miles are land and 1.9 square miles are water.

Children in Sudden Valley attend schools of the Bellingham School District — Geneva Elementary School, Kulshan Middle School, and Bellingham High School.