2026 Rankings

Worst CO & Gas Risk ZIP Codes in Maryland — 2026

Last updated: June 4, 2026

424 ZIP codes ranked by Gas Risk Score #1: ZIP 20753 (District Heights, MD) — 49/100
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 424 ZIP codes with data in Maryland, these are the highest-ranked areas for gas risk score. See also: National ZIP Codes with Worst CO & Gas Safety Risk | All Maryland Rankings

Statistic Value
ZIP codes ranked 424
Highest value 49/100
Median value 11/100
State Maryland

Top 100 Worst ZIP Codes

Rank ZIP Code City State Gas Risk Score Safety Score
1 20753 District Heights MD 49/100 50/100
2 20810 Bethesda MD 49/100 66/100
3 20811 Bethesda MD 49/100 66/100
4 20812 Glen Echo MD 49/100 53/100
5 20813 Bethesda MD 49/100 66/100
6 20814 Bethesda MD 49/100 65/100
7 20815 Chevy Chase MD 49/100 45/100
8 20816 Bethesda MD 49/100 65/100
9 20817 Bethesda MD 49/100 60/100
10 20818 Cabin John MD 49/100 45/100
11 20824 Bethesda MD 49/100 66/100
12 20825 Chevy Chase MD 49/100 40/100
13 20827 Bethesda MD 49/100 66/100
14 20830 Olney MD 49/100 40/100
15 20832 Olney MD 49/100 53/100
16 20833 Brookeville MD 49/100 53/100
17 20837 Poolesville MD 49/100 68/100
18 20838 Barnesville MD 49/100 66/100
19 20839 Beallsville MD 49/100 40/100
20 20841 Boyds MD 49/100 73/100
21 20842 Dickerson MD 49/100 45/100
22 20847 Rockville MD 49/100 40/100
23 20848 Rockville MD 49/100 40/100
24 20849 Rockville MD 49/100 40/100
25 20850 Rockville MD 49/100 53/100
26 20851 Rockville MD 49/100 53/100
27 20852 Rockville MD 49/100 45/100
28 20853 Rockville MD 49/100 45/100
29 20854 Potomac MD 49/100 35/100
30 20855 Derwood MD 49/100 53/100
31 20857 Rockville MD 49/100 40/100
32 20859 Potomac MD 49/100 33/100
33 20860 Sandy Spring MD 49/100 53/100
34 20861 Ashton MD 49/100 53/100
35 20862 Brinklow MD 49/100 40/100
36 20866 Burtonsville MD 49/100 53/100
37 20868 Spencerville MD 49/100 40/100
38 20871 Clarksburg MD 49/100 64/100
39 20872 Damascus MD 49/100 73/100
40 20874 Germantown MD 49/100 45/100
41 20875 Germantown MD 49/100 40/100
42 20876 Germantown MD 49/100 53/100
43 20877 Gaithersburg MD 49/100 53/100
44 20878 Gaithersburg MD 49/100 45/100
45 20879 Gaithersburg MD 49/100 53/100
46 20880 Washington Grove MD 49/100 40/100
47 20882 Gaithersburg MD 49/100 53/100
48 20883 Gaithersburg MD 49/100 40/100
49 20884 Gaithersburg MD 49/100 40/100
50 20885 Gaithersburg MD 49/100 40/100
51 20886 Montgomery Village MD 49/100 53/100
52 20889 Bethesda MD 49/100 66/100
53 20891 Kensington MD 49/100 40/100
54 20892 Bethesda MD 49/100 66/100
55 20894 Bethesda MD 49/100 66/100
56 20895 Kensington MD 49/100 45/100
57 20896 Garrett Park MD 49/100 53/100
58 20897 Suburb Maryland Fac MD 49/100 40/100
59 20898 Gaithersburg MD 49/100 40/100
60 20899 Gaithersburg MD 49/100 40/100
61 20901 Silver Spring MD 49/100 57/100
62 20902 Silver Spring MD 49/100 52/100
63 20903 Silver Spring MD 49/100 62/100
64 20904 Silver Spring MD 49/100 57/100
65 20905 Silver Spring MD 49/100 62/100
66 20906 Silver Spring MD 49/100 52/100
67 20907 Silver Spring MD 49/100 55/100
68 20908 Silver Spring MD 49/100 55/100
69 20910 Silver Spring MD 49/100 57/100
70 20911 Silver Spring MD 49/100 55/100
71 20912 Takoma Park MD 49/100 53/100
72 20913 Takoma Park MD 49/100 40/100
73 20914 Silver Spring MD 49/100 55/100
74 20915 Silver Spring MD 49/100 55/100
75 20916 Silver Spring MD 49/100 55/100
76 20918 Silver Spring MD 49/100 55/100
77 20993 Silver Spring MD 49/100 55/100
78 20997 Silver Spring MD 49/100 55/100
79 21001 Aberdeen MD 40/100 60/100
80 21005 Aberdeen Proving Ground MD 40/100 40/100
81 21009 Abingdon MD 40/100 64/100
82 21010 Gunpowder MD 40/100 40/100
83 21014 Bel Air MD 40/100 57/100
84 21017 Belcamp MD 40/100 53/100
85 21018 Benson MD 40/100 53/100
86 21028 Churchville MD 40/100 63/100
87 21034 Darlington MD 40/100 62/100
88 21040 Edgewood MD 40/100 45/100
89 21047 Fallston MD 40/100 55/100
90 21050 Forest Hill MD 40/100 55/100
91 21078 Havre De Grace MD 40/100 56/100
92 21081 Harford County MD 40/100 —
93 21084 Jarrettsville MD 40/100 63/100
94 21085 Joppa MD 40/100 40/100
95 21130 Perryman MD 40/100 40/100
96 21132 Pylesville MD 40/100 63/100
97 21154 Street MD 40/100 70/100
98 21160 Whiteford MD 40/100 53/100
99 21161 White Hall MD 40/100 73/100
100 20588 Dhs MD 16/100 53/100

Methodology

Gas risk rankings use PHMSA gas distribution incident data (2004-2026), mapped to counties and ZIP codes. Risk scores (0-100) factor in total incidents, fatalities, and recency. Counties with more incidents, deaths, and recent events score highest. Data source: U.S. DOT Pipeline and Hazardous Materials Safety Administration.

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 a gas distribution incident?

Gas distribution incidents involve failures in the local natural gas pipeline network — the pipes that carry gas from main lines to homes and businesses. These can cause explosions, fires, carbon monoxide poisoning, and property damage. PHMSA tracks all reported incidents nationally.

How can I protect my home from CO and gas leaks?

Install CO detectors on every level of your home (CPSC recommendation). Have gas appliances inspected annually by a licensed technician. Know the signs of a gas leak: rotten egg smell, hissing near gas lines, dead vegetation near pipelines. If you smell gas, leave immediately and call 911.

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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