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New Hampshire Water Quality Rankings

119 cities ranked · Data from EPA SDWIS

62.3
State avg score
119
Cities ranked
41%
A or B grade
37%
D or F grade
118
Health violations
21
PFAS detected
Analysis

New Hampshire water quality overview

New Hampshire's drinking water quality is fair overall, with a state average score of 62.3 out of 100 — 11.9 points below the national average of 74.2. The median city score is 66, reflecting how water quality is distributed across the state's 119 ranked cities. 37% of cities scored a D or F, pointing to significant water quality challenges across much of the state. 49 cities did earn an A or B grade, showing that strong systems do exist. PFAS "forever chemicals" were detected in 21 of 119 cities (18%). Of those, 15 cities exceed the 2024 EPA maximum contaminant levels — a health concern requiring action. 58 cities have lead levels exceeding the EPA action level of 15 ppb, typically a sign of aging lead service lines or lead solder in older plumbing. Residents in these areas should use an NSF 53-certified filter. 118 cities have recorded health-based violations with the EPA — meaning contaminant levels exceeded safe limits or required testing was missed. Use the table below to find your city's specific record.

Grade Distribution

How New Hampshire cities scored

18%
24%
22%
13%
24%
A
21
18%
Excellent
B
28
24%
Good
C
26
22%
Fair
D
16
13%
Poor
F
28
24%
Failing
Score Distribution

Score distribution by range

28 14 0
6
16
16
13
19
19
28
2
0–9
10–19
20–29
30–39
40–49
50–59
60–69
70–79
80–89
90–100
Comparison

State vs national average

C
New Hampshire
62.3/100
B-
National avg
74.2/100
▼ 11.9 pts below national average
City Map

Water quality across New Hampshire

Each dot is a city, colored by grade. Size reflects population served. Click any city to view its full report.

New Hampshire city water quality map
Water quality: A B C D F
68 cities mapped · hover to preview · click to explore
Highlights

Top & bottom cities in New Hampshire

Best 10 cities

  1. 1 A Litchfield 93.5 7K
  2. 2 A Claremont 90.3 9K
  3. 3 A- Antrim 89.9 920
  4. 4 A- Franklin 89.8 7K
  5. 5 A- Somersworth 89.7 12K
  6. 6 A- Bristol 89.7 4K
  7. 7 A- Keene 89.2 30K
  8. 8 A- Hanover 89.2 9K
  9. 9 A- Lancaster 89 2K
  10. 10 A- Bedford 88.8 5K

Worst 10 cities

  1. 110 F Moultonborough 27 3K
  2. 111 F Thornton 27.1 1K
  3. 112 F New Hampton 28 666
  4. 113 F Loudon 28 948
  5. 114 F Ossipee 29 2K
  6. 115 F Hopkinton 29 2K
  7. 116 F Plaistow 30 2K
  8. 117 F Campton 30 3K
  9. 118 F Belmont 30 4K
  10. 119 F Barrington 31 2K
Full Rankings

All 119 cities in New Hampshire

# City Grade Score Score Population Violations Issues
1 Litchfield
A
 93.5
7K 1 PFAS
2 Claremont
A
 90.3
9K 44 Health Unresolved
3 Antrim
A-
 89.9
920 12 Health Unresolved
4 Franklin
A-
 89.8
7K 75 Health Unresolved
5 Somersworth
A-
 89.7
12K 38 Health Unresolved
6 Bristol
A-
 89.7
4K 5 Health
7 Keene
A-
 89.2
30K 22 Health Unresolved
8 Hanover
A-
 89.2
9K 50 Health Unresolved
9 Lancaster
A-
 89
2K 44 Health Unresolved
10 Bedford
A-
 88.8
5K 9 Health PFAS Unresolved
11 Nashua
A-
 88.7
89K 4 Health Unresolved
12 Boscawen
A-
 88.6
4K 15 Health Unresolved
13 Barnstead
A-
 87.5
2K 74 Health Unresolved
14 Chester
A-
 87.3
578 60 Health Unresolved
15 Rye
A-
 86.7
4K 6 Health PFAS
16 Marlborough
A-
 86.7
850 75 Health Unresolved
17 Unity
A-
 86.4
625 89 Health Unresolved
18 Littleton
A-
 85.8
7K 77 Health Unresolved
19 Peterborough
A-
 85.3
5K 46 Health Unresolved
20 Hooksett
A-
 85.2
8K 78 Health PFAS Unresolved
21 Amherst
A-
 85.1
512 114 Health Unresolved
22 Merrimack
B+
 84.2
26K 42 Health Unresolved
23 Dover
B+
 84
29K 58 Health Unresolved
24 Berlin
B+
 83.3
10K 3 Health Unresolved
25 Whitefield
B+
 81.9
2K 16 Health Unresolved
26 Grantham
B+
 81
3K 50 Health Unresolved
27 Lincoln
B+
 81
3K 17 Health Unresolved
28 Jaffrey
B+
 80.9
4K 45 Health PFAS Unresolved
29 Portsmouth
B+
 80.7
43K 14 Health PFAS Unresolved
30 Newton
B+
 80.1
533 111 Health Unresolved
31 Newmarket
B
 79.3
5K 239 Health Unresolved
32 Durham
B
 78.8
16K 55 Health Unresolved
33 Farmington
B
 77.5
3K 17 Health Lead Unresolved
34 Epping
B
 76.7
2K 106 Health Unresolved
35 Pembroke
B
 75.8
5K 84 Health PFAS Unresolved
36 Hudson
B
 75.4
17K 68 Health PFAS Unresolved
37 Bennington
B
 75.4
1K 73 Health Unresolved
38 Wilton
B
 75.2
2K 28 Health Lead Unresolved
39 Tilton
B-
 74.4
1K 254 Health Unresolved
40 Henniker
B-
 73.8
3K 70 Health Lead Unresolved
41 Woodstock
B-
 73.8
3K 24 Health Lead Unresolved
42 Lebanon
B-
 72.9
10K 128 Health Unresolved
43 Newfields
B-
 72.7
550 22 Health Lead Unresolved
44 Troy
B-
 71.5
1K 52 Health Lead Unresolved
45 Hinsdale
B-
 71.2
3K 231 Health Unresolved
46 Newport
B-
 71.1
5K 168 Health Unresolved
47 Hampstead
B-
 71
7K 96 Health PFAS Unresolved
48 Gorham
B-
 70.9
3K 64 Health Lead Unresolved
49 Waterville Valley
B-
 70.6
3K 13 Health Lead Unresolved
50 Laconia
C+
 69.7
21K 94 Health Unresolved
51 Northumberland
C+
 69.3
3K 43 Health Lead Unresolved
52 Seabrook
C+
 68.2
14K 221 Health PFAS Unresolved
53 Sunapee
C+
 67.3
2K 82 Health Lead Unresolved
54 Plainfield
C+
 66.9
1K 182 Health Lead Unresolved
55 Wolfeboro
C+
 66.8
6K 129 Health Unresolved
56 New Castle
C+
 66.7
910 29 Health Lead Unresolved
57 Pittsfield
C+
 66.6
2K 124 Health Lead Unresolved
58 Colebrook
C+
 66.6
1K 69 Health Lead Unresolved
59 Brentwood
C+
 66.5
1K 7 Health Lead Unresolved
60 Sandown
C+
 66
1K 187 Health Unresolved
61 New London
C+
 65.7
3K 110 Health Lead Unresolved
62 Rollinsford
C+
 65.6
2K 47 Health Lead Unresolved
63 Franconia
C+
 65.4
1K 120 Health Lead Unresolved
64 Ashland
C+
 65.3
2K 105 Health Lead Unresolved
65 Lisbon
C
 64.9
1K 65 Health Lead Unresolved
66 Warner
C
 64.7
878 28 Health Lead Unresolved
67 Plymouth
C
 64.2
7K 255 Health Unresolved
68 Northwood
C
 64.1
996 118 Health Lead Unresolved
69 Winchester
C-
 59.5
3K 62 Health Unresolved
70 Northfield
C-
 59.5
3K 188 Health Lead Unresolved
71 Meredith
C-
 59.4
5K 292 Health Unresolved
72 Allenstown
C-
 59.4
1K 58 Health Lead Unresolved
73 Charlestown
C-
 58.1
3K 217 Health Lead Unresolved
74 Stow
C-
 56.8
1K 284 Health Unresolved
75 Jackson
C-
 55.6
755 92 Health Lead Unresolved
76 Swanzey
D+
 53.3
3K 291 Health Lead Unresolved
77 Bethlehem
D+
 51.8
2K 65 Health Lead Unresolved
78 Concord
D+
 51.3
44K 63 Health Unresolved
79 Kingston
D+
 51.2
627 16 Health Lead Unresolved
80 Manchester
D+
 50.9
124K 20 Health PFAS Unresolved
81 Wakefield
D+
 50.1
2K 78 Health Lead Unresolved
82 Greenville
D
 48.9
2K 153 Health Lead Unresolved
83 Walpole
D
 48.7
2K 210 Health Unresolved
84 Madison
D
 47.6
1K 61 Health Lead Unresolved
85 Salem
D
 47.4
22K 292 Health PFAS Unresolved
86 Epsom
D
 47.3
2K 99 Health Lead Unresolved
87 Haverhill
D
 46.7
4K 246 Health Lead Unresolved
88 Alton
D
 46.1
2K 214 Health Lead Unresolved
89 Goffstown
D
 45.9
5K 61 Health Lead Unresolved
90 Hillsborough
D
 45.9
3K 224 Health Lead Unresolved
91 Bartlett
D
 45.1
8K 555 Health Unresolved
92 Milford
F
 43
10K 195 Health Unresolved
93 Conway
F
 42.8
12K 597 Health Unresolved
94 Rochester
F
 42.5
26K 317 Health Unresolved
95 Derry
F
 42.5
21K 390 Health PFAS Unresolved
96 Raymond
F
 40.2
5K 154 Health Unresolved
97 Canaan
F
 40.1
1K 121 Health Lead Unresolved
98 Andover
F
 39.9
650 89 Health Lead Unresolved
99 Londonderry
F
 39
9K 605 Health PFAS Unresolved
100 Weare
F
 38.9
599 259 Health Lead Unresolved
101 Windham
F
 38.4
3K 169 Health Lead Unresolved
102 Exeter
F
 37.5
14K 203 Health PFAS Unresolved
103 Danville
F
 36.5
1K 249 Health Lead Unresolved
104 Stratham
F
 36
2K 387 Health Lead Unresolved
105 Freedom
F
 35.1
975 160 Health Lead Unresolved
106 Pelham
F
 35
2K 220 Health Lead Unresolved
107 Enfield
F
 33.2
2K 211 Health Lead Unresolved
108 Tamworth
F
 32
966 417 Health Lead Unresolved
109 Gilford
F
 31
4K 1030 Health Lead Unresolved
110 Barrington
F
 31
2K 619 Health Lead Unresolved
111 Belmont
F
 30
4K 444 Health Lead Unresolved
112 Campton
F
 30
3K 532 Health Lead Unresolved
113 Plaistow
F
 30
2K 382 Health Lead Unresolved
114 Hopkinton
F
 29
2K 119 Health Lead Unresolved
115 Ossipee
F
 29
2K 791 Health Lead Unresolved
116 Loudon
F
 28
948 374 Health Lead Unresolved
117 New Hampton
F
 28
666 133 Health Lead Unresolved
118 Thornton
F
 27.1
1K 355 Health Lead Unresolved
119 Moultonborough
F
 27
3K 627 Health Lead Unresolved
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