2026 Rankings

Worst ZIP Codes for Homebuyers in Connecticut — 2026

Last updated: June 4, 2026

433 ZIP codes ranked by Purchase Risk #1: ZIP 06371 (Old Lyme, CT) — 75/100
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 75/100
Median value 39/100
State Connecticut

Top 100 Worst ZIP Codes

Rank ZIP Code City State Purchase Risk Safety Score
1 06371 Old Lyme CT 75/100 40/100
2 06353 Montville CT 67/100 60/100
3 06702 Waterbury CT 67/100 65/100
4 06426 Essex CT 66/100 52/100
5 06498 Westbrook CT 66/100 54/100
6 06824 Fairfield CT 66/100 46/100
7 06412 Chester CT 65/100 54/100
8 06906 Stamford CT 65/100 64/100
9 06357 Niantic CT 64/100 52/100
10 06241 Dayville CT 63/100 41/100
11 06902 Stamford CT 63/100 54/100
12 06262 Quinebaug CT 62/100 78/100
13 06360 Norwich CT 61/100 49/100
14 06413 Clinton CT 61/100 53/100
15 06439 Hadlyme CT 61/100 53/100
16 06825 Fairfield CT 61/100 51/100
17 06854 Norwalk CT 61/100 54/100
18 06905 Stamford CT 61/100 59/100
19 06705 Waterbury CT 60/100 60/100
20 06710 Waterbury CT 60/100 65/100
21 06855 Norwalk CT 60/100 54/100
22 06480 Portland CT 59/100 56/100
23 06763 Morris CT 59/100 74/100
24 06853 Norwalk CT 59/100 54/100
25 06355 Mystic CT 58/100 51/100
26 06450 Meriden CT 58/100 56/100
27 06459 Middletown CT 58/100 61/100
28 06706 Waterbury CT 58/100 65/100
29 06907 Stamford CT 58/100 64/100
30 06258 Pomfret CT 57/100 50/100
31 06335 Gales Ferry CT 57/100 56/100
32 06373 Oneco CT 57/100 83/100
33 06389 Yantic CT 57/100 55/100
34 06451 Meriden CT 57/100 56/100
35 06604 Bridgeport CT 57/100 35/100
36 06607 Bridgeport CT 57/100 45/100
37 06704 Waterbury CT 57/100 60/100
38 06776 New Milford CT 57/100 67/100
39 06516 West Haven CT 56/100 51/100
40 06790 Torrington CT 56/100 72/100
41 06108 East Hartford CT 55/100 65/100
42 06408 Cheshire CT 55/100 50/100
43 06411 Cheshire CT 55/100 50/100
44 06471 North Branford CT 55/100 55/100
45 06475 Old Saybrook CT 55/100 35/100
46 06615 Stratford CT 55/100 35/100
47 06795 Watertown CT 55/100 74/100
48 06903 Stamford CT 55/100 59/100
49 06002 Bloomfield CT 54/100 69/100
50 06340 Groton CT 54/100 43/100
51 06365 Preston CT 54/100 64/100
52 06414 Cobalt CT 54/100 41/100
53 06488 Southbury CT 54/100 51/100
54 06226 Willimantic CT 53/100 74/100
55 06260 Putnam CT 53/100 71/100
56 06417 Deep River CT 53/100 61/100
57 06605 Bridgeport CT 53/100 35/100
58 06793 Washington CT 53/100 76/100
59 06801 Bethel CT 53/100 59/100
60 06118 East Hartford CT 52/100 60/100
61 06331 Canterbury CT 52/100 66/100
62 06339 Ledyard CT 52/100 50/100
63 06378 Stonington CT 52/100 60/100
64 06437 Guilford CT 52/100 55/100
65 06457 Middletown CT 52/100 56/100
66 06460 Milford CT 52/100 40/100
67 06481 Rockfall CT 52/100 54/100
68 06512 East Haven CT 52/100 30/100
69 06708 Waterbury CT 52/100 60/100
70 06757 Kent CT 52/100 74/100
71 06792 Torrington CT 52/100 76/100
72 06820 Darien CT 52/100 35/100
73 06904 Stamford CT 52/100 69/100
74 06910 Stamford CT 52/100 65/100
75 06911 Stamford CT 52/100 65/100
76 06912 Stamford CT 52/100 65/100
77 06913 Stamford CT 52/100 65/100
78 06914 Stamford CT 52/100 65/100
79 06920 Stamford CT 52/100 65/100
80 06921 Stamford CT 52/100 65/100
81 06922 Stamford CT 52/100 65/100
82 06925 Stamford CT 52/100 65/100
83 06926 Stamford CT 52/100 65/100
84 06927 Stamford CT 52/100 65/100
85 06928 Stamford CT 52/100 65/100
86 06234 Brooklyn CT 51/100 68/100
87 06279 Willington CT 51/100 66/100
88 06330 Baltic CT 51/100 63/100
89 06351 Jewett City CT 51/100 60/100
90 06375 Quaker Hill CT 51/100 64/100
91 06405 Branford CT 51/100 55/100
92 06410 Cheshire CT 51/100 48/100
93 06484 Shelton CT 51/100 55/100
94 06493 Wallingford CT 51/100 60/100
95 06494 Wallingford CT 51/100 60/100
96 06495 Wallingford CT 51/100 60/100
97 06701 Waterbury CT 51/100 65/100
98 06703 Waterbury CT 51/100 60/100
99 06720 Waterbury CT 51/100 60/100
100 06721 Waterbury CT 51/100 65/100

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: 2026-06-04.

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.

Get safety alerts for Connecticut

Free updates when EPA data changes for this area. No spam.

Unsubscribe anytime. Privacy Policy.

Share This Page

X Facebook
Check your water filter options Free tool — no phone call required.