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

King County Lake Quality

Washington, 92 lakes — no lake here has enough monitoring data for a grade

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. No lake in King County has enough sampling behind it for an A–F grade yet. The 92 monitored lakes below carry whatever clarity, phosphorus, and chlorophyll-a measurements exist.

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 Sep 11–13, 4 adults. Change dates on the map below.

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Quick Answers for King County

Cleanest lakes in King County →Safest 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 graded, 92 not rated0 graded lakes · 92 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
NRLake SammamishKingNR11.5 ftNo recent samplesNo recent samplesNo recent samples✓ Public
NRAngle LakeKingNR20 ftNo recent samplesNo recent samplesNo recent samples✓ Public
NRFindley LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMason LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake Kulla KullaKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRThompson LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake MoolockKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSMC LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDerrick LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNordrum LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSnoqualmie LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDeer LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBear LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHester LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRUpper Wildcat LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake CarolineKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKaleetan LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTuscohatchie LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPratt LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLower Tuscohatchie LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGold LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRChetwoot LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRAngeline LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRAzurite LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGlacier LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake ClariceKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMarmot LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake IlswootKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFisher LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLocket LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NROtter LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDelta LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBig Heart LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake MalachiteKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCopper LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Heart LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake DorothyKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFrancis LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDream LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMarten LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSunday LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake PhilippaKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLoch KatrineKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake MargaretKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRCottage LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPhantom LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPine LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRBeaver LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRAmes LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLanglois LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLake JoyKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake MarcelKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTolt River Regulating BasinKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSouth Fork Tolt ReservoirKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBridges LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKlaus LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCalligan LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake HancockKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake AliceKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRSnoqualmie Mill PondKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMasonry PoolKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRattlesnake LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRChester Morse LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHoward A Hanson ReservoirKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREagle LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWalsh LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWilderness LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLake SawyerKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRRetreat LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake Number TwelveKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMud LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDeep LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKeevie LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake MortonKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLake MeridianKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRPipe LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRShadow LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLake KathleenKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake DesireKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRSpring LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLake YoungsKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBurien LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRStar LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFivemile LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNorth LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLake KillarneyKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake GenevaKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRSteel LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLake UnionKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLake WashingtonKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRGreen LakeKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake Washington Ship CanalKingNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public

NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

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Other Counties in Washington

Lincoln County

22 lakes · Avg grade A

Grant County

48 lakes · Avg grade A

Whatcom County

34 lakes · Avg grade B

Yakima County

23 lakes · Avg grade C

Snohomish County

52 lakes · Avg grade C

Thurston County

29 lakes · Avg grade D

See how King County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..

Source: EPA National Aquatic Resource Surveys, 2026.