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

Suffolk County Lake Quality

New York, 46 lakes — no lake here has enough monitoring data for a grade

There are 46 monitored lakes in Suffolk County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. No lake in Suffolk County has enough sampling behind it for an A–F grade yet. The 46 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 Suffolk County

Top-rated places to stay near Suffolk County

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Quick Answers for Suffolk County

Cleanest lakes in Suffolk County →Cleanest lakes in New York →Safest swimming lakes in New York →

Planning a trip? Check special fishing regulations for Fresh Pond — or check the official New York fishing regulations.

All Lakes in Suffolk County

46 lakes · 0 graded, 46 not rated0 graded lakes · 46 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
NRFresh PondSuffolkNR6.5 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLong PondSuffolkNR4 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBig Fresh PondSuffolkNR7.5 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Fresh PondSuffolkNR3.8 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Long PondSuffolkNR10 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMiddle Farms PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBeach PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBig Reed PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NROyster PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake MontaukSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFort PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRFresh PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGreat PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTobaccolot PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHome PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMarion LakeSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDam PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGardiners CreekSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGreat PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHashamomuck PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLaurel LakeSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFlax PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMill PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNew MillpondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBelmont LakeSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSouthards PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake RonkonkomaSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRArtist LakeSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLower LakeSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake PanamokaSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDeep PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSwan PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWildwood LakeSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPeconic LakeSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRed Creek PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRScallop PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRAgawan LakeSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRChannel PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMill PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLong PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKellis PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPoxabogue PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGeorgica PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWainscott PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSagaponack PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHook PondSuffolkNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded

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 New York

Seneca County

4 lakes · Avg grade A

Hamilton County

198 lakes · Avg grade A

Herkimer County

110 lakes · Avg grade A

Essex County

129 lakes · Avg grade A

Lewis County

33 lakes · Avg grade B

Franklin County

134 lakes · Avg grade C

See how Suffolk 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.