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

Penobscot County Lake Quality

Maine, 148 lakes, measured by Maine DEP

Penobscot County in Maine carries 148 monitored lakes — one of the lake-richer counties in our dataset. Coverage that dense usually reflects active lake-association sampling alongside state-agency monitoring. 1 of those lake carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. On average, Penobscot County lakes carry some of the lowest phosphorus and chlorophyll-a readings in Maine, with clear summer transparency across most monitored basins.

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. Junior Lake has the lowest nutrient and algae readings in the county.

Loading map…

Where to stay near Penobscot County

Top-rated places to stay near Penobscot County

Prices for Oct 2–4, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Planning a trip to Penobscot County?

Get lake water-quality updates plus the best cabin & lodging deals near Penobscot County — straight to your inbox. No spam, unsubscribe anytime.

Quick Answers for Penobscot County

Cleanest lakes in Penobscot County →Best swimming lakes in Maine →

Planning a trip? Check special fishing regulations for Junior Lake — or check the official Maine fishing regulations.

All Lakes in Penobscot County

148 lakes · 1 ranked on readings, 147 without enough sampling1 lake ranked on readings · 147 without enough sampling, hidden

Include not-rated lakes (147)

#	Lake	Clarity	Phosphorus	Algae	Trophic	Max Depth	Access
1	Junior LakePenobscot	25.9 ft	6 µg/L	2 µg/L	No recent samples	No recent samples	Not recorded
	Alder StreamPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Atwood PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Back Settlement PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Ben Annis PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	9.8 ft	Not recorded
	Bog PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Boody PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Bowlin PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	13.1 ft	Not recorded
	Brewer LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	49.2 ft	Not recorded
	Brooks PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	11 ft	Not recorded
	Cambolasse PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	32 ft	Not recorded
	Carey LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Cedar LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	24 ft	Not recorded
	Center PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	13.1 ft	Not recorded
	Chemo PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	24 ft	Not recorded
	Cold Stream PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	103.4 ft	✓ Public
	Cranberry PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Crooked PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Davidson PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Davis PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	54 ft	Not recorded
	Dolby PondPenobscot	No recent samples	No recent samples	0.7 µg/L	No recent samples	No recent samples	✓ Public
	Duck LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	24 ft	Not recorded
	Dwinal PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Eagle PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	East Branch LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	East Branch Sebasticook River ReservoirPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Echo LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	52 ft	Not recorded
	Egg PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Elbow LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	Endless LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	36 ft	Not recorded
	Eskutassis PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded
	Etna PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	12 ft	Not recorded
	Ferguson LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Fields PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Fitts PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	59 ft	Not recorded
	Flatiron PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	18 ft	Not recorded
	Folsom PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	Garland PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	14 ft	Not recorded
	George PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	11 ft	Not recorded
	Grand Lake MatagamonPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	95 ft	Not recorded
	Grand Lake SeboeisPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	33 ft	Not recorded
	Gray Ledge DeadwaterPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Green PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	16.4 ft	Not recorded
	Gristmill PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Hammond PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	16.4 ft	Not recorded
	Hay LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	34 ft	Not recorded
	Hay PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	24 ft	Not recorded
	Hermon PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	16.4 ft	Not recorded
	Holbrook PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Holland PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	9.8 ft	Not recorded
	Horseshoe LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	25 ft	Not recorded
	Hot PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	7 ft	Not recorded
	Ireland PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	35 ft	Not recorded
	Jerry PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	13.1 ft	Not recorded
	Jones PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	6.6 ft	Not recorded
	Katahdin LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	29.5 ft	Not recorded
	Keg LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	42 ft	Not recorded
	Kimball PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	29.5 ft	Not recorded
	Lake WassookeagPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	85 ft	✓ Public
	Lane Brook PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	LaPomkeag LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	6.6 ft	Not recorded
	Lincoln PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Little Bowlin PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	8 ft	Not recorded
	Little Eskutassis PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Little Madagascal PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Little Mattamiscontis LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	13.1 ft	Not recorded
	Little Messer PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	4 ft	Not recorded
	Little Pushaw PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	18 ft	Not recorded
	Little Round PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	16.4 ft	Not recorded
	Little Salmon Stream LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	7 ft	Not recorded
	Lombard LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	37 ft	Not recorded
	Long PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Lost PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	41 ft	Not recorded
	Lowell LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	6 ft	Not recorded
	Lower East Ragged PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Lower LaPomkeag LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	Not recorded
	Lower Pug LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	32 ft	Not recorded
	Lower Shin PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	23 ft	Not recorded
	Lower West Ragged PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Lunksoos LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	13.1 ft	Not recorded
	Madagascal PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	32 ft	Not recorded
	Marble PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Mattamiscontis LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	38 ft	Not recorded
	Mattanawcook PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	22 ft	✓ Public
	Medunkeunk LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	11 ft	Not recorded
	Merrill PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Messer PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	13.1 ft	Not recorded
	Middle Jo-Mary LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Middle Springy PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Mill Privilege LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	27 ft	Not recorded
	Millimagassett LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	64 ft	Not recorded
	Millinocket LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	78 ft	Not recorded
	Morrell PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Mountain Catcher PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	16.4 ft	Not recorded
	Mower PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	23 ft	Not recorded
	Mud PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Nokomis PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	24 ft	Not recorded
	Nollesemic LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	23 ft	Not recorded
	North Twin LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Number Three PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	26 ft	Not recorded
	Parks PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	27 ft	Not recorded
	Partridge Brook FlowagePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Patten PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	12 ft	Not recorded
	Peaked Mountain PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	35 ft	Not recorded
	Perch PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	12 ft	Not recorded
	Pickerel PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	6.6 ft	Not recorded
	Pickett Mountain PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	7 ft	Not recorded
	Pleasant LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Plymouth PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	Not recorded
	Pond Farm PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Pushaw LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	28 ft	Not recorded
	Quakish LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Round PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	Not recorded
	Rush PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	12 ft	Not recorded
	Salmon Stream LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	16.4 ft	Not recorded
	Saponac PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	16 ft	Not recorded
	Sawtelle DeadwaterPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	Not recorded
	Sawtelle PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Scraggly LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	70 ft	✓ Public
	Sebasticook LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	50 ft	Not recorded
	Shad PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Silver LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	29.5 ft	Not recorded
	Smith PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	14 ft	Not recorded
	Snowshoe LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	44 ft	Not recorded
	Soldier PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	South Branch LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	28 ft	Not recorded
	South Twin LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Stump PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	13 ft	Not recorded
	Swetts PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	24 ft	Not recorded
	Tracy PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	9.8 ft	Not recorded
	Trout PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	Turkey Tail LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Umcolcus LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	17 ft	Not recorded
	Upper Cold Stream PondsPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	66 ft	Not recorded
	Upper PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	30 ft	Not recorded
	Upper Pug LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	16.4 ft	Not recorded
	Upper Shin PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	64 ft	Not recorded
	Upper Springy PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Upper Sysladobsis LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded
	Upper West Ragged PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Wadleigh DeadwaterPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Wadleigh PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	11 ft	Not recorded
	Webster PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Weir PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	25 ft	Not recorded
	West Garland PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	37 ft	Not recorded
	Weymouth PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	16.4 ft	Not recorded
	White Horse LakePenobscot	No recent samples	No recent samples	No recent samples	No recent samples	11 ft	Not recorded
	Wiley PondPenobscot	No recent samples	No recent samples	No recent samples	No recent samples	19.7 ft	Not recorded

NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.

Lake Match

Which lake suits how you actually use one?

Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of lakes that fit, with the water quality behind each one.

Take the quiz →

Other Counties in Maine

143 lakes

139 lakes

291 lakes

45 lakes

31 lakes

153 lakes

Browse every Maine 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 Maine Department of Environmental Protection. See data sources.