Rockingham County Lake Quality

New Hampshire, 49 lakes, average grade C (Fair)

There are 49 graded lakes in Rockingham County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.

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. Great Pond-North (A) is the cleanest in the county.

Loading map…

Where to stay near Rockingham County

Top-rated places to stay near Rockingham County

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 Rockingham County?

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

Quick Answers for Rockingham County

Cleanest lakes in Rockingham County →Cleanest lakes in New Hampshire →Safest swimming lakes in New Hampshire →

Planning a trip? Check special fishing regulations for Great Pond-North — or check the official New Hampshire fishing regulations.

All Lakes in Rockingham County

49 lakes · 41 graded, 8 not rated41 graded lakes · 8 not rated, hidden

Include not-rated lakes (8)

#	Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Access
1	AGreat Pond-NorthRockingham	A	No recent samples	16 µg/L	3.7 µg/L	No recent samples	Not recorded
2	APleasant Lake-Deep SpotRockingham	A	24.6 ft	7.5 µg/L	2.3 µg/L	No recent samples	Not recorded
3	BJenness Pond-Deep SpotRockingham	B	No recent samples	7.3 µg/L	1.6 µg/L	No recent samples	Not recorded
4	BNorthwood Lake-Lynn Grove BeachRockingham	B	No recent samples	11.1 µg/L	No recent samples	No recent samples	Not recorded
5	BNorthwood Lake-Old DumpRockingham	B	No recent samples	12.4 µg/L	No recent samples	No recent samples	Not recorded
6	BNorthwood Lake-Town BeachRockingham	B	No recent samples	13 µg/L	No recent samples	No recent samples	Not recorded
7	BOnway Lake-Deep SpotRockingham	B	No recent samples	15.2 µg/L	3.6 µg/L	No recent samples	Not recorded
8	BOnway Lake-Island RoadRockingham	B	No recent samples	8.8 µg/L	No recent samples	No recent samples	Not recorded
9	BOnway Lake-Sandy CoveRockingham	B	No recent samples	11.3 µg/L	No recent samples	No recent samples	Not recorded
10	BOnway Lake-SeannikkiRockingham	B	No recent samples	10.6 µg/L	No recent samples	No recent samples	Not recorded
11	BPawtuckaway Lake-Dolloff DamRockingham	B	No recent samples	9.2 µg/L	No recent samples	No recent samples	Not recorded
12	BRock Pond-Deep SpotRockingham	B	No recent samples	13.2 µg/L	5.1 µg/L	No recent samples	Not recorded
13	CBeaver Lake-Deep SpotRockingham	C	No recent samples	18.7 µg/L	5.8 µg/L	No recent samples	Not recorded
14	CCaptains Pond-Boat LaunchRockingham	C	No recent samples	26.9 µg/L	No recent samples	No recent samples	Not recorded
15	CCaptains Pond-Camp Y WoodRockingham	C	No recent samples	20.1 µg/L	No recent samples	No recent samples	Not recorded
16	CCaptains Pond-Deep SpotRockingham	C	No recent samples	25.6 µg/L	3.8 µg/L	No recent samples	Not recorded
17	CCobbetts Pond-ArmstrongRockingham	C	No recent samples	19.1 µg/L	No recent samples	No recent samples	Not recorded
18	CCobbetts Pond-Bella VistaRockingham	C	No recent samples	27.8 µg/L	No recent samples	No recent samples	Not recorded
19	CCobbetts Pond-Community BeachRockingham	C	No recent samples	19.3 µg/L	No recent samples	No recent samples	Not recorded
20	CCobbetts Pond-Town BeachRockingham	C	No recent samples	19.7 µg/L	No recent samples	No recent samples	Not recorded
21	CCountry Pond-Deep SpotRockingham	C	No recent samples	23 µg/L	3.7 µg/L	No recent samples	Not recorded
22	CGovernors Lake-Deep SpotRockingham	C	No recent samples	20.2 µg/L	4.9 µg/L	No recent samples	Not recorded
23	CGreat Pond-SouthRockingham	C	No recent samples	16.6 µg/L	3.7 µg/L	No recent samples	Not recorded
24	CHarantis Lake-Deep SpotRockingham	C	No recent samples	20.9 µg/L	4.2 µg/L	No recent samples	Not recorded
25	CLong Pond-Deep SpotRockingham	C	No recent samples	26.6 µg/L	3.2 µg/L	No recent samples	Not recorded
26	CMillville Lake-Car-Mar CoveRockingham	C	No recent samples	23.3 µg/L	No recent samples	No recent samples	Not recorded
27	CMillville Lake-Chucks CoveRockingham	C	No recent samples	21.4 µg/L	No recent samples	No recent samples	Not recorded
28	CMillville Lake-Deep SpotRockingham	C	No recent samples	25.2 µg/L	No recent samples	No recent samples	Not recorded
29	CMillville Lake-Right of WayRockingham	C	No recent samples	21.6 µg/L	No recent samples	No recent samples	Not recorded
30	CNorton Pond-Deep SpotRockingham	C	No recent samples	24.4 µg/L	No recent samples	No recent samples	Not recorded
31	CPawtuckaway Lake-NorthRockingham	C	No recent samples	17.5 µg/L	8 µg/L	No recent samples	Not recorded
32	CPawtuckaway Lake-SouthRockingham	C	No recent samples	13.4 µg/L	7 µg/L	No recent samples	Not recorded
33	CPowwow River LakeRockingham	C	No recent samples	18 µg/L	3.9 µg/L	No recent samples	Not recorded
34	CScobie Pond-Deep SpotRockingham	C	No recent samples	21.9 µg/L	No recent samples	No recent samples	Not recorded
35	CTower Hill Pond-Deep SpotRockingham	C	No recent samples	17.6 µg/L	No recent samples	No recent samples	Not recorded
36	DCaptains Pond-Buzzell CoveRockingham	D	No recent samples	28.7 µg/L	No recent samples	No recent samples	Not recorded
37	DHarvey Lake-Deep SpotRockingham	D	No recent samples	21.1 µg/L	9.9 µg/L	No recent samples	Not recorded
38	DNorthwood Lake-Esther Lane DocksRockingham	D	No recent samples	30.5 µg/L	No recent samples	No recent samples	Not recorded
39	DNorthwood Lake-Horse FarmRockingham	D	No recent samples	49.8 µg/L	No recent samples	No recent samples	Not recorded
40	DPhillips Pond-OutletRockingham	D	No recent samples	30 µg/L	No recent samples	No recent samples	Not recorded
41	DPleasant Lake-Loon CoveRockingham	D	No recent samples	31.6 µg/L	No recent samples	No recent samples	Not recorded
	NRAngle PondRockingham	NR	10.3 ft	No recent samples	No recent samples	No recent samples	Not recorded
	NRCaptain Pond-GallowRockingham	NR	No recent samples	21 µg/L	No recent samples	No recent samples	Not recorded
	NRHarvey Lake-Boat LaunchRockingham	NR	No recent samples	29.2 µg/L	No recent samples	No recent samples	Not recorded
	NRJenness Pond-Hood BeachRockingham	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
	NRNorthwood Lake-BlodgettRockingham	NR	No recent samples	132 µg/L	No recent samples	No recent samples	Not recorded
	NRNorthwood Lake-Pine PointRockingham	NR	No recent samples	10.3 µg/L	No recent samples	No recent samples	Not recorded
	NRPawtuckaway Lake-Drowns DamRockingham	NR	No recent samples	17.3 µg/L	No recent samples	No recent samples	Not recorded
	NRRock Pond-PicRockingham	NR	No recent samples	11.5 µg/L	No recent samples	No recent samples	Not recorded

NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

Lake Match

Which lake suits how you actually use one?

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

Take the quiz →

Other Counties in New Hampshire

Carroll County

22 lakes · Avg grade B

Sullivan County

25 lakes · Avg grade B

Grafton County

35 lakes · Avg grade B

Strafford County

16 lakes · Avg grade B

Coos County

15 lakes · Avg grade B

Cheshire County

39 lakes · Avg grade B

See how Rockingham County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.

Source: EPA National Aquatic Resource Surveys, 2026.