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

Sullivan County Lake Quality

New York, 112 lakes — no lake here has enough monitoring data for a grade

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. No lake in Sullivan County has enough sampling behind it for an A–F grade yet. The 112 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 Sullivan County

Top-rated places to stay near Sullivan County

Prices for Sep 11–13, 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 →Safest 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 graded, 112 not rated0 graded lakes · 112 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
NRPleasure LakeSullivanNR4.3 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
NRAnawanda LakeSullivanNR18.4 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSwamp PondSullivanNR3.9 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMontgomery LakeSullivanNR13.9 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMastens LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBeaverdam PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMongaup PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWaneta LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NROrchard LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake UncasSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRForest LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRAmber LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTrojan LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRShandelee LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHunter PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLily PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNorth PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNeversink ReservoirSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSouth Wind LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREast PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSilver LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRAlta LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBaileys LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRAnawana LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMorningside LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREvens LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLoch SheldrakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHilldale PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLuzon LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSilver LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSwan LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBriscoe LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGrossingers LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRevonah LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLenape LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMatawa LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSand PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake JeffersonSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHunter LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFilippini PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKazens PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHust PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKenoza LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMitchell PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCrystal LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake MuskodaySullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTennanah LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHolp PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake FlorenceSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRYork LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFeagles LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRClarks PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPerry PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake HuntingtonSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRLake KabauSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRChestnut Ridge PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMallory PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRIndian Field PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRToronto LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCrystal LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake NianqueSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHalfmoon LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBalsam PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWelmet LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBlind PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTurnpike PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFox LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDavis PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRock LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake La BarrSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRToasperns PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWashington LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSand PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake DeVenogeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSidwell LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHighland LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBeaver PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMohican LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake ChampionSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake MetauqueSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREcho LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBurnt Hope LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMongaup Falls ReservoirSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMerriewold LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRuddick PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHull PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLebanon LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSunrise LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWells PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRToronto ReservoirSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBlack LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake SuperiorSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWesserlauf PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWhite LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRMountain LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSackett LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSwinging Bridge ReservoirSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCliff LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWildwood LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSaint Josephs LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKiamesha LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDavis LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTreasure LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWanaksink LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake Louise MarieSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRYankee LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWolf LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTrout LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHemlock LakeSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBeaverdam PondSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRio ReservoirSullivanNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLochada LakeSullivanNRNo 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 Sullivan 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.