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

Hamilton County Lake Quality

New York, 198 lakes, average grade A (Excellent)

Hamilton County in New York carries 198 monitored lakes — one of the lake-richer counties in our dataset. Coverage that dense usually reflects active lake-association sampling alongside state-agency monitoring. 3 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county's average grade is A — among the cleanest in New York. 3 lakes pull an A on their own, and almost none fall into the D or F brackets.

The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Carry Pond (A); the most-stressed is Carry Pond (A).

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Where to stay near Hamilton County

Top-rated places to stay near Hamilton County

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

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Quick Answers for Hamilton County

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

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

All Lakes in Hamilton County

198 lakes · 3 graded, 195 not rated3 graded lakes · 195 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
1ACarry PondHamiltonANo recent samples15 µg/L2.2 µg/LNo recent samplesNot recorded
2AJockeybush LakeHamiltonANo recent samples7 µg/L2.2 µg/LNo recent samplesNot recorded
3AWillis LakeHamiltonANo recent samples8 µg/L0.5 µg/LNo recent samplesNot recorded
NRBlue Mountain LakeHamiltonNR21 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRaquette LakeHamiltonNR11.2 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake PleasantHamiltonNR13.9 ftNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKennels PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFerris LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLong LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDiamond LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRJerseyfield LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBochen LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTrout LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBig AlderbedHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRock LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBlack Cat LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRClockmill PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSand LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSheriff LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREvergreen LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMorehouse LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRThe FloeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBig Rock LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPine LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMetcalf LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWilmurt LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRJones LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDeer LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NROtter LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBalsam LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSpruce LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NROtter LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSampson LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSouth LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFalls PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDeep LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTwin LakesHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBrooktrout LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWest LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMud LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWhitney LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBeaver PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMitchell PondsHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMuskrat LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBeaver LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRIndian LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLimekiln LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSeventh LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samples✓ Public
NRBear PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake KoraHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMohegan LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREighth LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRUpper PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLower PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSagamore LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLower PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCranberry PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPigeon LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRChub LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRShallow LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPelcher PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBug LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRQueer LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCascade LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMays PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRConstable PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRussian LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBig Deer PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGrass PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTomar PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRClear PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHigh PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLoon PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBear PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Charley PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBettner PondsHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRound LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Tupper LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRStony PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDoctors PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFlatfish PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMoose PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBottle PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSutton PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRock PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSalmon LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLilypad PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Salmon LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHardigan PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBum PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCharley PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake LilaHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPartlow LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNehasane LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNorth PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWest PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRShingle Shanty PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRDeer PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRThayer LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRose PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTerror LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGull LakesHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLower Sister LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSouth PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBrandreth LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREast PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHigh PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRNew PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCary PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Forked LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPlumley PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRForked LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGrass PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRUpper PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSouth PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMud PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMinnow PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTirrel PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWolf PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGrassy PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSalmon PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLilypad PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCounty Line FlowHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCatlin LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRComer PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPickwacket PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMud PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMcRorie LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLong LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRShaw PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPark LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake EatonHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSand PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSlim PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGrampus LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMohegan LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHandsome PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRUpper Moose PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRThird PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSperry PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFirst PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSecond PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRound PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRJohn PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake FrancisHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCranberry PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBig Bad Luck PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRO K Slip PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRUnknown PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRAdirondack LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSprague PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRock LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRStephens PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCascade PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCrystal LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREagle LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRUtowana LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWakely PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCedar River FlowHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Moose LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRIndian LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCrotched PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRKings FlowHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRound PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLong PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRRock PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NROwl PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRJohn Mack PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLewey LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPillsbury LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMason LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWhitaker LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLittle Moose PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NREcho LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRElm LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBennett LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMiddle LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRCharley LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSand LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGilman LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSacandaga LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRFawn LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRVly LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NROxbow LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRPiseco LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBuckhorn LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRAirdwood LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRHamilton LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSpy LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMud LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLake AlgonquinHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWillis LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMurphy LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWoods LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRSilver LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRLoomis PondHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRTrout LakeHamiltonNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRGood Luck LakeHamiltonNRNo 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

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4 lakes · Avg grade A

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129 lakes · Avg grade A

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33 lakes · Avg grade B

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134 lakes · Avg grade C

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18 lakes · Avg grade C

See how Hamilton 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.