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

Sullivan County Lake Quality

New York, 112 lakes, measured by NY DEC

Sullivan County in New York carries 112 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 112 monitored lakes in Sullivan County carry whatever clarity, phosphorus, and chlorophyll-a readings NY DEC 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 Sullivan County

Top-rated places to stay near Sullivan County

Prices for Oct 23–25, 4 adults. Change dates on the map below.

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Quick Answers for Sullivan County

Cleanest lakes in Sullivan County →Cleanest lakes in New York →Best swimming lakes in New York →

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

All Lakes in Sullivan County

112 lakes · 0 ranked on readings, 112 without enough sampling0 lakes ranked on readings · 112 without enough sampling, hidden

#LakeClarityPhosphorusAlgaeTrophicMax DepthAccess
Pleasure LakeSullivan4.3 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Anawanda LakeSullivan18.4 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Swamp PondSullivan3.9 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Montgomery LakeSullivan13.9 ftNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mastens LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Beaverdam PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mongaup PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples12.5 ftNot recorded
Waneta LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples8.9 ftNot recorded
Orchard LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake UncasSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Forest LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Amber LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Trojan LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples7.2 ftNot recorded
Shandelee LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples19 ftNot recorded
Hunter PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lily PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples27.9 ftNot recorded
North PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Neversink ReservoirSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples187 ftNot recorded
South Wind LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
East PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Silver LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Alta LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples27.9 ftNot recorded
Baileys LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Anawana LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Morningside LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples8.2 ftNot recorded
Evens LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples3.3 ftNot recorded
Loch SheldrakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples52.5 ftNot recorded
Hilldale PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Luzon LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Silver LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Swan LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples10.5 ftNot recorded
Briscoe LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Grossingers LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Revonah LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lenape LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Matawa LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Sand PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake JeffersonSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Hunter LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Filippini PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Kazens PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Hust PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Kenoza LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples22.3 ftNot recorded
Mitchell PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Crystal LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples40 ftNot recorded
Lake MuskodaySullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples7.2 ftNot recorded
Tennanah LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples58.1 ftNot recorded
Holp PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake FlorenceSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
York LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples26.2 ftNot recorded
Feagles LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Clarks PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Perry PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake HuntingtonSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples45.9 ft✓ Public
Lake KabauSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Chestnut Ridge PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mallory PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Indian Field PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples22 ftNot recorded
Toronto LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Crystal LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples24 ftNot recorded
Lake NianqueSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples13.5 ftNot recorded
Halfmoon LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples15.4 ftNot recorded
Balsam PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Welmet LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Blind PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Turnpike PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples5.9 ftNot recorded
Fox LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples16.7 ftNot recorded
Davis PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples17.4 ftNot recorded
Rock LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples32.8 ftNot recorded
Lake La BarrSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Toasperns PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Washington LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Sand PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples65 ftNot recorded
Lake DeVenogeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Sidwell LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Highland LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples19.7 ftNot recorded
Beaver PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mohican LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake ChampionSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake MetauqueSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Echo LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Burnt Hope LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Mongaup Falls ReservoirSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples12.5 ftNot recorded
Merriewold LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Ruddick PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Hull PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lebanon LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Sunrise LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Wells PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Toronto ReservoirSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples59.1 ftNot recorded
Black LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples24.9 ftNot recorded
Lake SuperiorSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples28.2 ftNot recorded
Wesserlauf PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
White LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples85 ft✓ Public
Mountain LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Sackett LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples33.8 ftNot recorded
Swinging Bridge ReservoirSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples85 ftNot recorded
Cliff LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples31.2 ftNot recorded
Wildwood LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Saint Josephs LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples8.2 ftNot recorded
Kiamesha LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples31.2 ftNot recorded
Davis LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples7.9 ftNot recorded
Treasure LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples21.7 ftNot recorded
Wanaksink LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Lake Louise MarieSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples18 ftNot recorded
Yankee LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples23 ftNot recorded
Wolf LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Trout LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Hemlock LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Beaverdam PondSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
Rio ReservoirSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samples34.4 ftNot recorded
Lochada LakeSullivanNo recent samplesNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded

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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Browse every New York 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 New York Department of Environmental Conservation. See data sources.