Least Reliable Water Systems in New Hampshire

Out of 284 ZIP codes with data in New Hampshire, these are the lowest-ranked areas for reliability score. See also: National Least Reliable Water Systems in America | All New Hampshire Rankings

Statistic	Value
ZIP codes ranked	284
Lowest value	10/100
Median value	73/100
State	New Hampshire

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Reliability Score	Safety Score
1	03307	Loudon	NH	10/100	40/100
2	03574	Bethlehem	NH	23/100	52/100
3	03216	Andover	NH	25/100	51/100
4	03256	New Hampton	NH	25/100	33/100
5	03281	Weare	NH	25/100	57/100
6	03301	Concord	NH	25/100	53/100
7	03302	Concord	NH	25/100	58/100
8	03303	Concord	NH	25/100	53/100
9	03305	Concord	NH	25/100	50/100
10	03838	Glen	NH	25/100	15/100
11	03042	Epping	NH	30/100	50/100
12	03849	Madison	NH	30/100	12/100
13	03811	Atkinson	NH	35/100	66/100
14	03865	Plaistow	NH	38/100	65/100
15	03869	Rollinsford	NH	39/100	40/100
16	03047	Greenfield	NH	40/100	53/100
17	03812	Bartlett	NH	40/100	60/100
18	03885	Stratham	NH	40/100	55/100
19	03076	Pelham	NH	45/100	62/100
20	03819	Danville	NH	49/100	70/100
21	03855	New Durham	NH	49/100	73/100
22	03741	Canaan	NH	52/100	52/100
23	03861	Lee	NH	52/100	71/100
24	03825	Barrington	NH	53/100	73/100
25	03748	Enfield	NH	54/100	70/100
26	03826	East Hampstead	NH	54/100	70/100
27	03234	Epsom	NH	55/100	65/100
28	03242	Henniker	NH	55/100	54/100
29	03608	Walpole	NH	55/100	69/100
30	03079	Salem	NH	57/100	69/100
31	03470	Winchester	NH	57/100	69/100
32	03756	Lebanon	NH	57/100	78/100
33	03766	Lebanon	NH	57/100	74/100
34	03872	Sanbornville	NH	57/100	50/100
35	03254	Moultonborough	NH	58/100	41/100
36	03049	Hollis	NH	59/100	73/100
37	03817	Chocorua	NH	59/100	53/100
38	03886	Tamworth	NH	59/100	43/100
39	03037	Deerfield	NH	60/100	70/100
40	03044	Fremont	NH	60/100	70/100
41	03230	Danbury	NH	60/100	63/100
42	03233	Elkins	NH	60/100	53/100
43	03285	Thornton	NH	60/100	53/100
44	03287	Wilmot	NH	60/100	72/100
45	03887	Union	NH	60/100	63/100
46	03045	Goffstown	NH	61/100	62/100
47	03077	Raymond	NH	61/100	70/100
48	03229	Contoocook	NH	61/100	72/100
49	03253	Meredith	NH	61/100	78/100
50	03304	Bow	NH	61/100	71/100
51	03823	Madbury	NH	61/100	46/100
52	03846	Jackson	NH	61/100	59/100
53	03238	Glencliff	NH	62/100	49/100
54	03266	Rumney	NH	62/100	49/100
55	03275	Suncook	NH	62/100	64/100
56	03279	Warren	NH	62/100	74/100
57	03053	Londonderry	NH	64/100	76/100
58	03249	Gilford	NH	64/100	73/100
59	03882	Effingham	NH	64/100	51/100
60	03087	Windham	NH	65/100	75/100
61	03227	Center Sandwich	NH	65/100	40/100
62	03231	East Andover	NH	65/100	53/100
63	03240	Grafton	NH	65/100	53/100
64	03255	Newbury	NH	65/100	57/100
65	03269	Sanbornton	NH	65/100	75/100
66	03284	Springfield	NH	65/100	53/100
67	03290	Nottingham	NH	65/100	70/100
68	03442	Bennington	NH	65/100	70/100
69	03444	Dublin	NH	65/100	63/100
70	03455	Marlborough	NH	65/100	75/100
71	03468	West Peterborough	NH	65/100	53/100
72	03579	Errol	NH	65/100	75/100
73	03749	Enfield Center	NH	65/100	53/100
74	03830	East Wakefield	NH	65/100	53/100
75	03832	Eaton Center	NH	65/100	40/100
76	03847	Kearsarge	NH	65/100	40/100
77	03852	Milton Mills	NH	65/100	40/100
78	03871	Rye Beach	NH	65/100	50/100
79	03875	Silver Lake	NH	65/100	40/100
80	03878	Somersworth	NH	65/100	71/100
81	03223	Campton	NH	67/100	52/100
82	03743	Claremont	NH	67/100	77/100
83	03816	Center Tuftonboro	NH	67/100	31/100
84	03818	Conway	NH	67/100	59/100
85	03845	Intervale	NH	67/100	69/100
86	03848	Kingston	NH	67/100	56/100
87	03870	Rye	NH	67/100	59/100
88	03894	Wolfeboro	NH	67/100	69/100
89	03040	East Candia	NH	68/100	63/100
90	03046	Dunbarton	NH	68/100	63/100
91	03057	Mont Vernon	NH	68/100	50/100
92	03070	New Boston	NH	68/100	63/100
93	03084	Temple	NH	68/100	53/100
94	03261	Northwood	NH	68/100	73/100
95	03282	Wentworth	NH	68/100	63/100
96	03443	Chesterfield	NH	68/100	63/100
97	03447	Fitzwilliam	NH	68/100	58/100
98	03461	Rindge	NH	68/100	58/100
99	03462	Spofford	NH	68/100	63/100
100	03466	West Chesterfield	NH	68/100	63/100

Methodology

Water system reliability scores (0-100) combine violation frequency, violation recency, resolution rate, and system size. Systems with repeated health-based violations and unresolved issues score lowest. The reliability score focuses specifically on the water utility performance, distinct from the broader Home Safety Score.

Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-06-04.

Frequently Asked Questions

What does a low water reliability score mean?

A low reliability score (below 50) indicates a water system with frequent violations, poor resolution rates, or recurring compliance issues. These systems may have aging infrastructure, inadequate treatment, or management challenges.

How is reliability different from safety score?

The reliability score focuses specifically on the water utility performance (violations, resolution, compliance). The Home Safety Score is broader, also including lead risk, radon, and flood data. A ZIP code can have a reliable water system but still have high radon or flood risk.

Least Reliable Water Systems in New Hampshire — 2026

100 Lowest-Ranked ZIP Codes

Methodology

Frequently Asked Questions

What does a low water reliability score mean?

How is reliability different from safety score?

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