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

Plymouth County Lake Quality

Massachusetts, 104 lakes, average grade C (Fair)

Plymouth County in Massachusetts carries 104 monitored lakes — one of the lake-richer counties in our dataset. Coverage that dense usually reflects active lake-association sampling alongside state-agency monitoring. 11 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.

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 Robbins Pond (A); the most-stressed is Furnace Pond (F).

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Quick Answers for Plymouth County

Cleanest lakes in Plymouth County →Safest swimming lakes in Massachusetts →

Planning a trip? Check special fishing regulations for Robbins Pond — or check the official Massachusetts fishing regulations.

All Lakes in Plymouth County

104 lakes · 11 graded, 93 not rated11 graded lakes · 93 not rated, hidden

Include not-rated lakes (93)

#	Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Access
1	ARobbins PondPlymouth	A	No recent samples	No recent samples	3.1 µg/L	No recent samples	Not recorded
2	AMarys PondPlymouth	A	No recent samples	No recent samples	2.6 µg/L	No recent samples	Not recorded
3	AEzekiel PondPlymouth	A	No recent samples	No recent samples	5 µg/L	No recent samples	Not recorded
4	AIsland PondPlymouth	A	No recent samples	No recent samples	5.8 µg/L	No recent samples	✓ Public
5	AWankinco River LakePlymouth	A	No recent samples	No recent samples	3.8 µg/L	No recent samples	✓ Public
6	BFresh PondPlymouth	B	No recent samples	No recent samples	9.2 µg/L	No recent samples	✓ Public
7	CHalfway PondPlymouth	C	No recent samples	No recent samples	17.2 µg/L	No recent samples	✓ Public
8	DMonponsett PondPlymouth	D	No recent samples	No recent samples	13 µg/L	No recent samples	✓ Public
9	DCleveland PondPlymouth	D	No recent samples	No recent samples	16.9 µg/L	No recent samples	Not recorded
10	FFurnace PondPlymouth	F	No recent samples	No recent samples	46.8 µg/L	No recent samples	✓ Public
11	FCooks PondPlymouth	F	No recent samples	No recent samples	48.4 µg/L	No recent samples	✓ Public
	NRSnows PondPlymouth	NR	18.6 ft	No recent samples	No recent samples	No recent samples	Not recorded
	NRWhite Oak Brook LakePlymouth	NR	No recent samples	No recent samples	11.3 µg/L	No recent samples	Not recorded
	NRWhite Island PondPlymouth	NR	No recent samples	No recent samples	12.8 µg/L	No recent samples	Not recorded
	NRSilver LakePlymouth	NR	No recent samples	No recent samples	3 µg/L	No recent samples	Not recorded
	NRStetson PondPlymouth	NR	No recent samples	No recent samples	11.4 µg/L	No recent samples	Not recorded
	NRWright ReservoirPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRNorth Hill PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSouth River ReservoirPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLower Chandler PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRIsland Creek PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBartlett PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSavery PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBloody PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLong PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRGallows PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLittle Long PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRIsland PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBeaver Dam PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBoot PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRGreat South PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRCurlew PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRGunners Exchange PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRCollege PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NREast Head PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRDunham PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRCrane Brook Bog PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSampson PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRFederal PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRWenham PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRFresh Meadow PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRDarby PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBig West PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLittle South PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRRussell MillpondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLittle PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBillington SeaPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRMuddy PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRIndian PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRMuddy PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRTispaquin PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRWoods PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRAssawompset PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLoon PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRElders PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRCarver PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLake NippenicketPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRTown River ReservoirPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRWest Meadow Brook PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRRobbins ReservoirPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBurrage Pond - Lower ReservoirPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRWest LakePlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLittle Sandy Bottom PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRGreat Sandy Bottom PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRIndian Head PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBurrage Pond - Upper ReservoirPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRWampatuck PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRMaquan PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NROldham PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRStump PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRStudleys PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRIsland Grove PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRStraits PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRAccord PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRJacobs PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRMusquashcut PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRWaldo LakePlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRThirtyacre PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NREel PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	NRLong PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NREgger Bog PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLittle Quittacas PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLong PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSnipatuit PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRGreat Quittacas PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRAssawompset PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLeonards PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRDicks PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBlackmore PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRHorseshoe PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRTihonet PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSmalley BogsPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRWeweantic River ReservoirPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRFawn PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBesse Bog ReservoirPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRGlen Charlie PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRMill PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRSpectacle PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLittle Sandy PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRWhites PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRBig Sandy PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRLittle Herring PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRHedges PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRGreat Herring PondPlymouth	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not 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 Massachusetts

Franklin County

26 lakes · Avg grade A

Norfolk County

32 lakes · Avg grade A

Berkshire County

72 lakes · Avg grade B

Worcester County

220 lakes · Avg grade B

Barnstable County

94 lakes · Avg grade B

Hampshire County

21 lakes · Avg grade B

See how Plymouth 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.