Worst Infrastructure: New Hampshire

Out of 262 ZIP codes with infrastructure data in New Hampshire, these areas face the highest estimated risk of water pipe failure based on infrastructure age, funding gaps, and violation history.

Statistic	Value
ZIP codes ranked	262
Highest risk	59%
Median risk	39%
Average risk	40%
State	New Hampshire

Top 100 Highest Risk ZIP Codes

Rank	ZIP Code	City	State	Pipe Failure Risk	Risk Level	Safety Score
1	03301	Concord	NH	59%	High	53/100
2	03238	Glencliff	NH	58%	High	49/100
3	03838	Glen	NH	57%	High	15/100
4	03869	Rollinsford	NH	57%	High	40/100
5	03256	New Hampton	NH	54%	High	33/100
6	03303	Concord	NH	52%	High	53/100
7	03216	Andover	NH	51%	High	51/100
8	03849	Madison	NH	51%	High	12/100
9	03233	Elkins	NH	50%	High	53/100
10	03273	South Sutton	NH	50%	High	63/100
11	03574	Bethlehem	NH	50%	High	52/100
12	03609	North Walpole	NH	50%	High	53/100
13	03864	Ossipee	NH	50%	High	38/100
14	03886	Tamworth	NH	50%	High	43/100
15	03047	Greenfield	NH	49%	High	53/100
16	03221	Bradford	NH	49%	High	53/100
17	03242	Henniker	NH	49%	High	54/100
18	03275	Suncook	NH	49%	High	64/100
19	03441	Ashuelot	NH	49%	High	63/100
20	03580	Franconia	NH	49%	High	56/100
21	03741	Canaan	NH	49%	High	52/100
22	03865	Plaistow	NH	49%	High	65/100
23	03570	Berlin	NH	48%	High	83/100
24	03748	Enfield	NH	48%	High	70/100
25	03823	Madbury	NH	48%	High	46/100
26	03048	Greenville	NH	47%	High	55/100
27	03049	Hollis	NH	47%	High	73/100
28	03266	Rumney	NH	47%	High	49/100
29	03307	Loudon	NH	47%	High	40/100
30	03452	Jaffrey	NH	47%	High	71/100
31	03743	Claremont	NH	47%	High	77/100
32	03816	Center Tuftonboro	NH	47%	High	31/100
33	03867	Rochester	NH	47%	High	76/100
34	03878	Somersworth	NH	47%	High	71/100
35	03064	Nashua	NH	46%	High	83/100
36	03079	Salem	NH	46%	High	69/100
37	03229	Contoocook	NH	46%	High	72/100
38	03235	Franklin	NH	46%	High	83/100
39	03467	Westmoreland	NH	46%	High	58/100
40	03584	Lancaster	NH	46%	High	70/100
41	03768	Lyme	NH	46%	High	58/100
42	03801	Portsmouth	NH	46%	High	77/100
43	03846	Jackson	NH	46%	High	59/100
44	03885	Stratham	NH	46%	High	55/100
45	03060	Nashua	NH	45%	High	78/100
46	03223	Campton	NH	45%	High	52/100
47	03245	Holderness	NH	45%	High	47/100
48	03264	Plymouth	NH	45%	High	77/100
49	03447	Fitzwilliam	NH	45%	High	58/100
50	03450	Harrisville	NH	45%	High	53/100
51	03470	Winchester	NH	45%	High	69/100
52	03582	Groveton	NH	45%	High	55/100
53	03593	Randolph	NH	45%	High	53/100
54	03607	South Acworth	NH	45%	High	53/100
55	03773	Newport	NH	45%	High	54/100
56	03809	Alton	NH	45%	High	55/100
57	03811	Atkinson	NH	45%	High	66/100
58	03814	Center Ossipee	NH	45%	High	34/100
59	03042	Epping	NH	44%	High	50/100
60	03076	Pelham	NH	44%	High	62/100
61	03246	Laconia	NH	44%	High	78/100
62	03253	Meredith	NH	44%	High	78/100
63	03254	Moultonborough	NH	44%	High	41/100
64	03561	Littleton	NH	44%	High	75/100
65	03581	Gorham	NH	44%	High	70/100
66	03603	Charlestown	NH	44%	High	58/100
67	03608	Walpole	NH	44%	High	69/100
68	03766	Lebanon	NH	44%	High	74/100
69	03847	Kearsarge	NH	44%	High	40/100
70	03850	Melvin Village	NH	44%	High	40/100
71	03883	South Tamworth	NH	44%	High	53/100
72	03034	Candia	NH	43%	High	74/100
73	03101	Manchester	NH	43%	High	80/100
74	03103	Manchester	NH	43%	High	75/100
75	03231	East Andover	NH	43%	High	53/100
76	03458	Peterborough	NH	43%	High	67/100
77	03465	Troy	NH	43%	High	72/100
78	03785	Woodsville	NH	43%	High	75/100
79	03817	Chocorua	NH	43%	High	53/100
80	03890	West Ossipee	NH	43%	High	45/100
81	03894	Wolfeboro	NH	43%	High	69/100
82	03302	Concord	NH	43%	High	58/100
83	03305	Concord	NH	43%	High	50/100
84	03104	Manchester	NH	42%	High	75/100
85	03259	North Sandwich	NH	42%	High	40/100
86	03263	Pittsfield	NH	42%	High	75/100
87	03431	Keene	NH	42%	High	73/100
88	03448	Gilsum	NH	42%	High	63/100
89	03451	Hinsdale	NH	42%	High	75/100
90	03455	Marlborough	NH	42%	High	75/100
91	03586	Sugar Hill	NH	42%	High	63/100
92	03750	Etna	NH	42%	High	53/100
93	03752	Goshen	NH	42%	High	63/100
94	03777	Orford	NH	42%	High	75/100
95	03839	Rochester	NH	42%	High	81/100
96	03845	Intervale	NH	42%	High	69/100
97	03868	Rochester	NH	42%	High	81/100
98	03870	Rye	NH	42%	High	59/100
99	03872	Sanbornville	NH	42%	High	50/100
100	03045	Goffstown	NH	41%	High	62/100

Methodology

Infrastructure risk rankings combine four data sources, each weighted equally (25%): (1) EPA Drinking Water Infrastructure Needs Survey (DWINS 2023) — state-level 20-year funding gap per capita for pipe replacement, treatment, and storage; (2) Census ACS housing vintage — percentage of homes built before 1980, when lead solder and galvanized pipes were common; (3) EPA SDWIS violation and enforcement data — system-level compliance history; (4) Lead and Copper Rule indicators — service line material inventories and 90th percentile lead testing results. The combined score is normalized to a 0-100% probability scale.

Data sources: EPA DWINS 2023, Census ACS, EPA SDWIS, Lead and Copper Rule data. Last updated: 2026-06-04.

Frequently Asked Questions

What does pipe failure probability mean?

Pipe failure probability estimates the likelihood of water main breaks, lead contamination from corroded pipes, or service disruptions based on infrastructure age, state funding gaps, violation history, and lead indicators. It is not a prediction of imminent failure, but a risk assessment based on known factors.

How is infrastructure risk calculated?

The risk score combines four equally weighted factors: state-level infrastructure funding gap per capita (from EPA DWINS 2023), housing vintage (Census ACS pre-1980 housing percentage), water system violation and enforcement history (EPA SDWIS), and lead exposure indicators (service line probability and testing results).

What can homeowners do about aging infrastructure?

Test your tap water annually, especially for lead. Check if your home has a lead service line through your water utility. Consider a whole-house water filter (NSF/ANSI 53 certified). Review your water system Consumer Confidence Report for violation history.

Does high risk mean my water is unsafe right now?

Not necessarily. Infrastructure risk indicates long-term vulnerability, not current contamination. However, areas with aging pipes and high violation counts have a statistically higher chance of water quality issues. Regular testing is the best way to verify your water safety.

Worst Infrastructure: New Hampshire — 2026 Rankings