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

Hillsborough County Lake Quality

New Hampshire, 81 lakes, measured by NHDES

Hillsborough County in New Hampshire carries 81 monitored lakes — one of the lake-richer counties in our dataset. Coverage that dense usually reflects active lake-association sampling alongside state-agency monitoring. 33 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. For Hillsborough County the spread behind the average matters more than the average itself: a few nutrient-rich lakes among many clear ones produce the same figure as the inverse.

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. Deering Reservoir-Deep Spot has the lowest nutrient and algae readings in the county.

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Quick Answers for Hillsborough County

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Planning a trip? Check special fishing regulations for Deering Reservoir-Deep Spot — or check the official New Hampshire fishing regulations.

All Lakes in Hillsborough County

81 lakes · 33 ranked on readings, 48 without enough sampling33 lakes ranked on readings · 48 without enough sampling, hidden

Include not-rated lakes (48)

#	Lake	Clarity	Phosphorus	Algae	Trophic	Max Depth	Access
1	Deering Reservoir-Deep SpotHillsborough	No recent samples	9.6 µg/L	3 µg/L	No recent samples	No recent samples	✓ Public
2	Gregg Lake-Deep SpotHillsborough	No recent samples	9.9 µg/L	3.9 µg/L	No recent samples	No recent samples	✓ Public
3	Nubanusit Lake-Deep SpotHillsborough	No recent samples	5 µg/L	1.3 µg/L	No recent samples	No recent samples	Not recorded
4	Pleasant Pond-Deep SpotHillsborough	No recent samples	12.6 µg/L	4.3 µg/L	No recent samples	No recent samples	Not recorded
5	Contention Pond-Deep SpotHillsborough	No recent samples	12 µg/L	8.5 µg/L	No recent samples	No recent samples	Not recorded
6	Deering Lake-Morrotta BayHillsborough	No recent samples	9.5 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
7	Nubanusit Lake-Hancock LandingHillsborough	No recent samples	5 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
8	Pleasant Pond-Dam OutletHillsborough	No recent samples	10.1 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
9	Pratt Pond-Deep SpotHillsborough	No recent samples	10.7 µg/L	8.2 µg/L	No recent samples	No recent samples	Not recorded
10	Pratt Pond-West ShoreHillsborough	No recent samples	7.6 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
11	Rocky Pond-VlapHillsborough	No recent samples	10.5 µg/L	4.4 µg/L	No recent samples	No recent samples	✓ Public
12	Silver Lake-Deep SpotHillsborough	No recent samples	11.4 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
13	Weare Reservoir-Collins LandingHillsborough	No recent samples	8.1 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
14	Weare Reservoir-Cottage Rd BrookHillsborough	No recent samples	11.4 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
15	Weare Reservoir-DamHillsborough	No recent samples	10.3 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
16	Weare Reservoir-Deep SpotHillsborough	No recent samples	14.1 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
17	Crystal Lake-Deep SpotHillsborough	No recent samples	16.9 µg/L	2.8 µg/L	No recent samples	No recent samples	Not recorded
18	Franklin Pierce Lake-Deep SpotHillsborough	No recent samples	10.5 µg/L	6.2 µg/L	No recent samples	No recent samples	✓ Public
19	Gregg Lake-Hattie Brown BrookHillsborough	No recent samples	19 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
20	Haunted Lake-Deep SpotHillsborough	No recent samples	18.7 µg/L	8.6 µg/L	No recent samples	No recent samples	Not recorded
21	Long Pond-NhHillsborough	No recent samples	24.2 µg/L	14.1 µg/L	No recent samples	No recent samples	✓ Public
22	Norway Pond-Deep SpotHillsborough	No recent samples	12.1 µg/L	5.1 µg/L	No recent samples	No recent samples	✓ Public
23	Nutt Pond-Deep SpotHillsborough	No recent samples	26.8 µg/L	7.4 µg/L	No recent samples	No recent samples	✓ Public
24	Otternick Pond-Deep SpotHillsborough	No recent samples	23.7 µg/L	7.8 µg/L	No recent samples	No recent samples	✓ Public
25	Tobey Reservoir-Deep SpotHillsborough	No recent samples	16.1 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
26	Darrah Pond-Deep SpotHillsborough	No recent samples	158.9 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
27	Dorrs Pond-Deep SpotHillsborough	No recent samples	27.7 µg/L	13.3 µg/L	No recent samples	No recent samples	✓ Public
28	Lincoln Pond-Deep SpotHillsborough	No recent samples	34.4 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
29	Lovewell Pond-Deep SpotHillsborough	No recent samples	35.8 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
30	Pleasant Pond-Public LandingHillsborough	No recent samples	419 µg/L	No recent samples	No recent samples	No recent samples	✓ Public
31	Robinson Pond-Deep SpotHillsborough	No recent samples	37 µg/L	13.6 µg/L	No recent samples	No recent samples	✓ Public
32	Sebbins Pond-Deep SpotHillsborough	No recent samples	36.5 µg/L	3.5 µg/L	No recent samples	No recent samples	Not recorded
33	Stevens Pond-Deep SpotHillsborough	No recent samples	26.2 µg/L	11.8 µg/L	No recent samples	No recent samples	✓ Public
	Baboosic LakeHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	25 ft	Not recorded
	Bagley PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	40 ft	Not recorded
	Beaver Dam PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Black PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	15 ft	Not recorded
	Bowers PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Burton PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Cranberry Meadow PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	5 ft	Not recorded
	Cunningham PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	15 ft	✓ Public
	Daniels LakeHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	Not recorded
	Deering Lake-Campbell BayHillsborough	No recent samples	7.1 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
	Deering Lake-Zowski CoveHillsborough	No recent samples	7.4 µg/L	No recent samples	No recent samples	No recent samples	Not recorded
	Dodge PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	9.8 ft	Not recorded
	Dudley PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	Dunklee PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	6.9 ft	Not recorded
	Edward MacDowell ReservoirHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	3.6 ft	✓ Public
	Everett LakeHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	15 ft	Not recorded
	Flints PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	5 ft	✓ Public
	Glen LakeHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	50 ft	Not recorded
	Gould PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	35 ft	Not recorded
	Greens PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	14.1 ft	Not recorded
	Gumpas PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	Halfmoon PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	15 ft	Not recorded
	Harris PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	Horseshoe PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	✓ Public
	Hortons PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	Not recorded
	Hunts PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	50 ft	Not recorded
	Island PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	Not recorded
	Joe English PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	29.9 ft	Not recorded
	King Brook ReservoirHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	7 ft	Not recorded
	Loon PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	23 ft	Not recorded
	Mount William PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	✓ Public
	Naticook LakeHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	15 ft	✓ Public
	Noone Falls Mill Dam LakeHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
	Nubanusit Lake-Daloz CoveHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Otter LakeHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	15 ft	✓ Public
	Pennichuck PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Potanipo PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	25 ft	✓ Public
	Powder Mill PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	15 ft	Not recorded
	Pratt PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	5.2 ft	Not recorded
	Shattuck PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	Steels PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	18 ft	Not recorded
	Sunset LakeHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	20 ft	Not recorded
	Talbot SwampHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	Water Loom PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	Not recorded
	White PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	10 ft	Not recorded
	Whittemore LakeHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	55 ft	✓ Public
	Willard PondHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	50 ft	✓ Public
	Zephyr LakeHillsborough	No recent samples	No recent samples	No recent samples	No recent samples	15 ft	✓ Public

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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Source: the New Hampshire Department of Environmental Services. See data sources.