2026 Rankings

Worst ZIP Codes for Homebuyers in Connecticut — 2026

Last updated: July 19, 2026

433 ZIP codes ranked by Purchase Risk #1: ZIP 06371 (Old Lyme, CT) - 76/100
Lead Violations Lowest Score Safest Flood Risk Energy Cost Radon PFAS Reliability EJ Index Homebuyer Risk CO & Gas Safest Gas Remediation Burden Unresolved Violations (by Utility) Water Equity (by Utility)

Out of 433 ZIP codes with data in Connecticut, these are the highest-ranked areas for purchase risk. See also: National Worst ZIP Codes for Homebuyers — Hidden Risk Factors | All Connecticut Rankings

Statistic Value
ZIP codes ranked 433
Highest value 76/100
Median value 42/100
State Connecticut

Top 100 Worst ZIP Codes

Rank ZIP Code City State Purchase Risk Safety Score
1 06371 Old Lyme CT 76/100 40/100
2 06702 Waterbury CT 70/100 65/100
3 06353 Montville CT 68/100 60/100
4 06824 Fairfield CT 68/100 46/100
5 06906 Stamford CT 68/100 64/100
6 06426 Essex CT 67/100 52/100
7 06498 Westbrook CT 67/100 54/100
8 06412 Chester CT 66/100 54/100
9 06902 Stamford CT 66/100 54/100
10 06357 Niantic CT 65/100 52/100
11 06241 Dayville CT 64/100 41/100
12 06905 Stamford CT 64/100 59/100
13 06262 Quinebaug CT 63/100 78/100
14 06360 Norwich CT 63/100 49/100
15 06705 Waterbury CT 63/100 60/100
16 06710 Waterbury CT 63/100 65/100
17 06825 Fairfield CT 63/100 51/100
18 06854 Norwalk CT 63/100 54/100
19 06413 Clinton CT 62/100 53/100
20 06439 Hadlyme CT 62/100 53/100
21 06480 Portland CT 62/100 56/100
22 06763 Morris CT 62/100 74/100
23 06855 Norwalk CT 62/100 54/100
24 06450 Meriden CT 61/100 56/100
25 06459 Middletown CT 61/100 61/100
26 06706 Waterbury CT 61/100 65/100
27 06853 Norwalk CT 61/100 54/100
28 06907 Stamford CT 61/100 64/100
29 06355 Mystic CT 60/100 51/100
30 06408 Cheshire CT 60/100 50/100
31 06411 Cheshire CT 60/100 50/100
32 06451 Meriden CT 60/100 56/100
33 06607 Bridgeport CT 60/100 45/100
34 06704 Waterbury CT 60/100 60/100
35 06776 New Milford CT 60/100 67/100
36 06258 Pomfret CT 59/100 50/100
37 06471 North Branford CT 59/100 55/100
38 06516 West Haven CT 59/100 51/100
39 06604 Bridgeport CT 59/100 35/100
40 06790 Torrington CT 59/100 72/100
41 06108 East Hartford CT 58/100 65/100
42 06335 Gales Ferry CT 58/100 56/100
43 06373 Oneco CT 58/100 83/100
44 06389 Yantic CT 58/100 55/100
45 06615 Stratford CT 58/100 35/100
46 06792 Torrington CT 58/100 76/100
47 06795 Watertown CT 58/100 74/100
48 06903 Stamford CT 58/100 59/100
49 06002 Bloomfield CT 57/100 69/100
50 06414 Cobalt CT 57/100 41/100
51 06488 Southbury CT 57/100 51/100
52 06793 Washington CT 57/100 76/100
53 06801 Bethel CT 57/100 59/100
54 06904 Stamford CT 57/100 69/100
55 06910 Stamford CT 57/100 65/100
56 06911 Stamford CT 57/100 65/100
57 06912 Stamford CT 57/100 65/100
58 06913 Stamford CT 57/100 65/100
59 06914 Stamford CT 57/100 65/100
60 06920 Stamford CT 57/100 65/100
61 06921 Stamford CT 57/100 65/100
62 06922 Stamford CT 57/100 65/100
63 06925 Stamford CT 57/100 65/100
64 06926 Stamford CT 57/100 65/100
65 06927 Stamford CT 57/100 65/100
66 06928 Stamford CT 57/100 65/100
67 06128 East Hartford CT 56/100 66/100
68 06138 East Hartford CT 56/100 66/100
69 06226 Willimantic CT 56/100 74/100
70 06475 Old Saybrook CT 56/100 35/100
71 06493 Wallingford CT 56/100 60/100
72 06494 Wallingford CT 56/100 60/100
73 06495 Wallingford CT 56/100 60/100
74 06701 Waterbury CT 56/100 65/100
75 06703 Waterbury CT 56/100 60/100
76 06720 Waterbury CT 56/100 60/100
77 06721 Waterbury CT 56/100 65/100
78 06722 Waterbury CT 56/100 60/100
79 06723 Waterbury CT 56/100 60/100
80 06724 Waterbury CT 56/100 60/100
81 06725 Waterbury CT 56/100 60/100
82 06726 Waterbury CT 56/100 60/100
83 06749 Waterbury CT 56/100 60/100
84 06757 Kent CT 56/100 74/100
85 06118 East Hartford CT 55/100 60/100
86 06279 Willington CT 55/100 66/100
87 06340 Groton CT 55/100 43/100
88 06365 Preston CT 55/100 64/100
89 06405 Branford CT 55/100 55/100
90 06457 Middletown CT 55/100 56/100
91 06460 Milford CT 55/100 40/100
92 06481 Rockfall CT 55/100 54/100
93 06512 East Haven CT 55/100 30/100
94 06605 Bridgeport CT 55/100 35/100
95 06708 Waterbury CT 55/100 60/100
96 06820 Darien CT 55/100 35/100
97 06828 Fairfield CT 55/100 61/100
98 06043 Bolton CT 54/100 67/100
99 06260 Putnam CT 54/100 71/100
100 06331 Canterbury CT 54/100 66/100

Methodology

The Home Purchase Risk Score combines environmental hazards that create unexpected costs for homebuyers: water system violations requiring filtration, lead service lines requiring replacement, radon requiring mitigation systems, flood zones requiring insurance, and aging infrastructure requiring upgrades. These are factors that standard home inspections may not fully capture.

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: 2026-07-19.

Frequently Asked Questions

What is the Home Purchase Risk Score?

This score (0-100) estimates the hidden environmental costs a homebuyer may face: water filtration needs, lead pipe replacement, radon mitigation, flood insurance, and infrastructure upgrades. Higher scores mean more potential unexpected expenses after purchase.

What should homebuyers do in high-risk ZIP codes?

Request a water quality test, check for lead service lines with the utility, test for radon before closing, verify FEMA flood zone designation, and factor in potential remediation costs ($5,000-$30,000+) to your budget.

Explore More Rankings

How this ranking is calculated, data sources, and limitations: Rankings Methodology →

Related Rankings

Water Safety 2026 EPA violations and water quality scores Lead Risk 2026 Lead pipe infrastructure and EPA exceedances Infrastructure 2026 Aging pipes, system age and remediation costs
Disclaimer: Rankings are based on EPA, FEMA, and federal agency data. They reflect historical patterns and risk indicators, not necessarily current conditions. For the most current information, contact your local water utility or request a Consumer Confidence Report.

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