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LakeQuality
Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water

King County Lake Quality

Washington, 92 lakes, measured by Washington Ecology

King County in Washington carries 92 monitored lakes — one of the lake-richer counties in our dataset. Coverage that dense usually reflects active lake-association sampling alongside state-agency monitoring. The 92 monitored lakes in King County carry whatever clarity, phosphorus, and chlorophyll-a readings Washington Ecology has published, shown as reported.

Most of the county's monitored lakes are shallow, under 50 feet, which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed.

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Where to stay near King County

Top-rated places to stay near King County

Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.

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Quick Answers for King County

Cleanest lakes in King County →Best swimming lakes in Washington →

Planning a trip? Check special fishing regulations for Lake Sammamish — or check the official Washington fishing regulations.

All Lakes in King County

92 lakes · 0 ranked on readings, 92 without enough sampling0 lakes ranked on readings · 92 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicMax DepthAccess
Lake SammamishKing11.5 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Angle LakeKing20 ftNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Findley LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mason LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake Kulla KullaKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Thompson LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samples50 ftNot recorded
Lake MoolockKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
SMC LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Derrick LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Nordrum LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Snoqualmie LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Deer LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Bear LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Hester LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Upper Wildcat LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake CarolineKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Kaleetan LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samples182 ftNot recorded
Tuscohatchie LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Pratt LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lower Tuscohatchie LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Gold LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Chetwoot LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Angeline LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Azurite LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Glacier LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake ClariceKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Marmot LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake IlswootKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Fisher LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Locket LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Otter LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Delta LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Big Heart LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake MalachiteKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Copper LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Little Heart LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake DorothyKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Francis LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Dream LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Marten LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Sunday LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake PhilippaKingNo recent samplesNo recent samplesNo recent samplesNo recent samples324 ftNot recorded
Loch KatrineKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake MargaretKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Cottage LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Phantom LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Pine LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samples39 ft✓ Public
Beaver LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samples54 ft✓ Public
Ames LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Langlois LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Lake JoyKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake MarcelKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Tolt River Regulating BasinKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
South Fork Tolt ReservoirKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Bridges LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Klaus LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Calligan LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samples96 ftNot recorded
Lake HancockKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake AliceKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Snoqualmie Mill PondKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Masonry PoolKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Rattlesnake LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Chester Morse LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Howard A Hanson ReservoirKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Eagle LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Walsh LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Wilderness LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samples36 ft✓ Public
Lake SawyerKingNo recent samplesNo recent samplesNo recent samplesNo recent samples58 ft✓ Public
Retreat LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake Number TwelveKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mud LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Deep LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samples70 ftNot recorded
Keevie LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake MortonKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Lake MeridianKingNo recent samplesNo recent samplesNo recent samplesNo recent samples90 ft✓ Public
Pipe LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Shadow LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Lake KathleenKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake DesireKingNo recent samplesNo recent samplesNo recent samplesNo recent samples20 ft✓ Public
Spring LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samples31 ft✓ Public
Lake YoungsKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Burien LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Star LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Fivemile LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
North LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Lake KillarneyKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake GenevaKingNo recent samplesNo recent samplesNo recent samplesNo recent samples45 ft✓ Public
Steel LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Lake UnionKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Lake WashingtonKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
Green LakeKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake Washington Ship CanalKingNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public

NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.

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Other Counties in Washington

Lincoln County

22 lakes

Grant County

48 lakes

Whatcom County

34 lakes

Yakima County

23 lakes

Snohomish County

52 lakes

Thurston County

29 lakes

Browse every Washington lake, or the full directory of lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: the Washington State Department of Ecology. See data sources.