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Look up individual lakes in King County


Swimming beach water quality

Subscribe to water quality alerts or weekly status of freshwater swimming beaches across King County:

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Lake water quality

Lake maps

Thumbnail map of trophic state of King County lakes

Lake resources, guides and references

Learn about King County's program to protect shorelines, promote public access, and establish priorities for shoreline uses for the county's large lakes, rivers and Puget Sound.

Lake history

  • History of King County's regional wastewater treatment utility
    Read how our region worked to keep our lakes and Puget Sound clean and healthy, including the early days of sewage treatment and disposal in King County, the birth of Metro and development of regional facilities to process the waste produced by our metropolitan area.
  • The birth of Metro (external link)
  • Lake Washington story
    A discussion about the value of Lake Washington, its past pollution problems and subsequent efforts to clean up the lake.
  • Lake Sammamish story
    An overview of Lake Sammamish and its value to people and wildlife, the lake's past pollution problems and subsequent efforts to keep the lake clean.

Lake programs