2026 Rankings

Lowest Home Safety Scores in Maryland — 2026

Last updated: August 14, 2026

206 ZIP codes ranked by Safety Score #1: ZIP 21001 (Aberdeen, MD) - 48/100
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 206 ZIP codes with data in Maryland, these are the lowest-ranked areas for safety score. See also: National Lowest Home Safety Scores in America | All Maryland Rankings

Statistic Value
ZIP codes ranked 206
Lowest value 48/100
Median value 66/100
State Maryland

100 Lowest-Ranked ZIP Codes

Rank ZIP Code City State Safety Score Safety Score
1 21001 Aberdeen MD 48/100 48/100
2 21042 Ellicott City MD 48/100 48/100
3 21771 Mount Airy MD 48/100 48/100
4 21788 Thurmont MD 48/100 48/100
5 21005 Aberdeen Proving Ground MD 49/100 49/100
6 21014 Bel Air MD 49/100 49/100
7 21015 Bel Air MD 49/100 49/100
8 21047 Fallston MD 49/100 49/100
9 21050 Forest Hill MD 49/100 49/100
10 21157 Westminster MD 49/100 49/100
11 21703 Frederick MD 49/100 49/100
12 21769 Middletown MD 49/100 49/100
13 20837 Poolesville MD 50/100 50/100
14 21074 Hampstead MD 50/100 50/100
15 21102 Manchester MD 50/100 50/100
16 21713 Boonsboro MD 50/100 50/100
17 21756 Keedysville MD 50/100 50/100
18 21787 Taneytown MD 50/100 50/100
19 21921 Elkton MD 58/100 58/100
20 21078 Havre De Grace MD 59/100 59/100
21 21227 Halethorpe MD 60/100 60/100
22 21229 Baltimore MD 60/100 60/100
23 20850 Rockville MD 61/100 61/100
24 20851 Rockville MD 61/100 61/100
25 20852 Rockville MD 61/100 61/100
26 20853 Rockville MD 61/100 61/100
27 20854 Potomac MD 61/100 61/100
28 20855 Derwood MD 61/100 61/100
29 21210 Baltimore MD 62/100 62/100
30 21211 Baltimore MD 62/100 62/100
31 20794 Jessup MD 63/100 63/100
32 21043 Ellicott City MD 63/100 63/100
33 21087 Kingsville MD 63/100 63/100
34 21163 Woodstock MD 63/100 63/100
35 21784 Sykesville MD 63/100 63/100
36 21030 Cockeysville MD 64/100 64/100
37 21031 Hunt Valley MD 64/100 64/100
38 21052 Fort Howard MD 64/100 64/100
39 21071 Glyndon MD 64/100 64/100
40 21117 Owings Mills MD 64/100 64/100
41 21128 Perry Hall MD 64/100 64/100
42 21131 Phoenix MD 64/100 64/100
43 21133 Randallstown MD 64/100 64/100
44 21136 Reisterstown MD 64/100 64/100
45 21162 White Marsh MD 64/100 64/100
46 21201 Baltimore MD 64/100 64/100
47 21202 Baltimore MD 64/100 64/100
48 21204 Towson MD 64/100 64/100
49 21205 Baltimore MD 64/100 64/100
50 21206 Baltimore MD 64/100 64/100
51 21207 Gwynn Oak MD 64/100 64/100
52 21208 Pikesville MD 64/100 64/100
53 21209 Baltimore MD 64/100 64/100
54 21212 Baltimore MD 64/100 64/100
55 21213 Baltimore MD 64/100 64/100
56 21214 Baltimore MD 64/100 64/100
57 21215 Baltimore MD 64/100 64/100
58 21216 Baltimore MD 64/100 64/100
59 21217 Baltimore MD 64/100 64/100
60 21218 Baltimore MD 64/100 64/100
61 21219 Sparrows Point MD 64/100 64/100
62 21220 Middle River MD 64/100 64/100
63 21221 Essex MD 64/100 64/100
64 21222 Dundalk MD 64/100 64/100
65 21223 Baltimore MD 64/100 64/100
66 21224 Baltimore MD 64/100 64/100
67 21228 Catonsville MD 64/100 64/100
68 21230 Baltimore MD 64/100 64/100
69 21231 Baltimore MD 64/100 64/100
70 21233 Baltimore MD 64/100 64/100
71 21234 Parkville MD 64/100 64/100
72 21236 Nottingham MD 64/100 64/100
73 21237 Rosedale MD 64/100 64/100
74 21239 Baltimore MD 64/100 64/100
75 21244 Windsor Mill MD 64/100 64/100
76 21250 Baltimore MD 64/100 64/100
77 21251 Baltimore MD 64/100 64/100
78 21286 Towson MD 64/100 64/100
79 21287 Baltimore MD 64/100 64/100
80 21740 Hagerstown MD 64/100 64/100
81 21793 Walkersville MD 64/100 64/100
82 20732 Chesapeake Beach MD 65/100 65/100
83 21702 Frederick MD 65/100 65/100
84 21795 Williamsport MD 65/100 65/100
85 20657 Lusby MD 66/100 66/100
86 20678 Prince Frederick MD 66/100 66/100
87 20723 Laurel MD 66/100 66/100
88 20841 Boyds MD 66/100 66/100
89 21009 Abingdon MD 66/100 66/100
90 21017 Belcamp MD 66/100 66/100
91 21040 Edgewood MD 66/100 66/100
92 21045 Columbia MD 66/100 66/100
93 21046 Columbia MD 66/100 66/100
94 21085 Joppa MD 66/100 66/100
95 21104 Marriottsville MD 66/100 66/100
96 21130 Perryman MD 66/100 66/100
97 21701 Frederick MD 66/100 66/100
98 21704 Frederick MD 66/100 66/100
99 21710 Adamstown MD 66/100 66/100
100 21716 Brunswick MD 66/100 66/100

Methodology

Home Safety Score model 4.0.0 combines SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, county-level EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the 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: 2026-08-14.

Frequently Asked Questions

What does a low Home Safety Score mean?

A score below 40 (grade F) means the four measured model components produced a low combined result. It does not claim that every property hazard was measured.

Can a ZIP code score change?

Yes. A later accepted release can change the score when any measured component changes. Every release identifies its score model and source periods.

Explore More Rankings

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

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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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