Worst Infrastructure: Connecticut

Out of 424 ZIP codes with infrastructure data in Connecticut, 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	424
Highest risk	68%
Median risk	46%
Average risk	44%
State	Connecticut

Top 100 Highest Risk ZIP Codes

Rank	ZIP Code	City	State	Pipe Failure Risk	Risk Level	Safety Score
1	06389	Yantic	CT	68%	Very High	55/100
2	06091	West Hartland	CT	65%	Very High	53/100
3	06263	Rogers	CT	63%	Very High	53/100
4	06758	Lakeside	CT	63%	Very High	53/100
5	06332	Central Village	CT	61%	Very High	53/100
6	06373	Oneco	CT	61%	Very High	83/100
7	06387	Wauregan	CT	61%	Very High	53/100
8	06459	Middletown	CT	61%	Very High	61/100
9	06258	Pomfret	CT	61%	Very High	50/100
10	06061	Pine Meadow	CT	60%	High	53/100
11	06108	East Hartford	CT	60%	High	65/100
12	06481	Rockfall	CT	60%	High	54/100
13	06607	Bridgeport	CT	60%	High	45/100
14	06710	Waterbury	CT	60%	High	65/100
15	06128	East Hartford	CT	60%	High	66/100
16	06138	East Hartford	CT	60%	High	66/100
17	06118	East Hartford	CT	59%	High	60/100
18	06409	Centerbrook	CT	59%	High	53/100
19	06260	Putnam	CT	58%	High	71/100
20	06604	Bridgeport	CT	58%	High	35/100
21	06610	Bridgeport	CT	58%	High	45/100
22	06706	Waterbury	CT	58%	High	65/100
23	06024	East Canaan	CT	57%	High	63/100
24	06069	Sharon	CT	57%	High	74/100
25	06264	Scotland	CT	57%	High	53/100
26	06456	Middle Haddam	CT	57%	High	40/100
27	06605	Bridgeport	CT	57%	High	35/100
28	06702	Waterbury	CT	57%	High	65/100
29	06242	Eastford	CT	56%	High	63/100
30	06255	North Grosvenordale	CT	56%	High	63/100
31	06439	Hadlyme	CT	56%	High	53/100
32	06517	Hamden	CT	56%	High	45/100
33	06606	Bridgeport	CT	56%	High	35/100
34	06615	Stratford	CT	56%	High	35/100
35	06790	Torrington	CT	56%	High	72/100
36	06906	Stamford	CT	56%	High	64/100
37	06002	Bloomfield	CT	55%	High	69/100
38	06027	East Hartland	CT	55%	High	53/100
39	06043	Bolton	CT	55%	High	67/100
40	06095	Windsor	CT	55%	High	65/100
41	06241	Dayville	CT	55%	High	41/100
42	06277	Thompson	CT	55%	High	74/100
43	06339	Ledyard	CT	55%	High	50/100
44	06376	South Lyme	CT	55%	High	53/100
45	06608	Bridgeport	CT	55%	High	45/100
46	06787	Thomaston	CT	55%	High	63/100
47	06795	Watertown	CT	55%	High	74/100
48	06812	New Fairfield	CT	55%	High	63/100
49	06076	Stafford Springs	CT	54%	High	61/100
50	06279	Willington	CT	54%	High	66/100
51	06281	Woodstock	CT	54%	High	46/100
52	06360	Norwich	CT	54%	High	49/100
53	06412	Chester	CT	54%	High	54/100
54	06704	Waterbury	CT	54%	High	60/100
55	06755	Gaylordsville	CT	54%	High	63/100
56	06903	Stamford	CT	54%	High	59/100
57	06907	Stamford	CT	54%	High	64/100
58	06092	West Simsbury	CT	53%	High	63/100
59	06226	Willimantic	CT	53%	High	74/100
60	06331	Canterbury	CT	53%	High	66/100
61	06371	Old Lyme	CT	53%	High	40/100
62	06417	Deep River	CT	53%	High	61/100
63	06514	Hamden	CT	53%	High	40/100
64	06708	Waterbury	CT	53%	High	60/100
65	06763	Morris	CT	53%	High	74/100
66	06793	Washington	CT	53%	High	76/100
67	06801	Bethel	CT	53%	High	59/100
68	06825	Fairfield	CT	53%	High	51/100
69	06905	Stamford	CT	53%	High	59/100
70	06040	Manchester	CT	52%	High	86/100
71	06052	New Britain	CT	52%	High	85/100
72	06114	Hartford	CT	52%	High	86/100
73	06320	New London	CT	52%	High	40/100
74	06335	Gales Ferry	CT	52%	High	56/100
75	06365	Preston	CT	52%	High	64/100
76	06382	Uncasville	CT	52%	High	68/100
77	06443	Madison	CT	52%	High	55/100
78	06480	Portland	CT	52%	High	56/100
79	06705	Waterbury	CT	52%	High	60/100
80	06751	Bethlehem	CT	52%	High	83/100
81	06853	Norwalk	CT	52%	High	54/100
82	06006	Windsor	CT	52%	High	66/100
83	06031	Falls Village	CT	51%	High	63/100
84	06066	Vernon Rockville	CT	51%	High	65/100
85	06111	Newington	CT	51%	High	83/100
86	06262	Quinebaug	CT	51%	High	78/100
87	06354	Moosup	CT	51%	High	63/100
88	06355	Mystic	CT	51%	High	51/100
89	06414	Cobalt	CT	51%	High	41/100
90	06426	Essex	CT	51%	High	52/100
91	06457	Middletown	CT	51%	High	56/100
92	06752	Bridgewater	CT	51%	High	61/100
93	06757	Kent	CT	51%	High	74/100
94	06778	Northfield	CT	51%	High	53/100
95	06824	Fairfield	CT	51%	High	46/100
96	06855	Norwalk	CT	51%	High	54/100
97	06010	Bristol	CT	50%	High	67/100
98	06018	Canaan	CT	50%	High	82/100
99	06020	Canton Center	CT	50%	High	73/100
100	06022	Collinsville	CT	50%	High	66/100

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: 2026-07-19.

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: Connecticut — 2026 Rankings