2026 Rankings

Worst CO & Gas Risk ZIP Codes in Washington — 2026

Last updated: June 4, 2026

475 ZIP codes ranked by Gas Risk Score #1: ZIP 98001 (Auburn, WA) — 10/100
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 475 ZIP codes with data in Washington, these are the highest-ranked areas for gas risk score. See also: National ZIP Codes with Worst CO & Gas Safety Risk | All Washington Rankings

Statistic Value
ZIP codes ranked 475
Highest value 10/100
Median value 2/100
State Washington

Top 100 Worst ZIP Codes

Rank ZIP Code City State Gas Risk Score Safety Score
1 98001 Auburn WA 10/100 84/100
2 98002 Auburn WA 10/100 84/100
3 98003 Federal Way WA 10/100 91/100
4 98004 Bellevue WA 10/100 82/100
5 98005 Bellevue WA 10/100 87/100
6 98006 Bellevue WA 10/100 82/100
7 98007 Bellevue WA 10/100 82/100
8 98008 Bellevue WA 10/100 82/100
9 98009 Bellevue WA 10/100 88/100
10 98010 Black Diamond WA 10/100 95/100
11 98011 Bothell WA 10/100 84/100
12 98013 Burton WA 10/100 73/100
13 98014 Carnation WA 10/100 82/100
14 98015 Bellevue WA 10/100 88/100
15 98018 King County WA 10/100 —
16 98019 Duvall WA 10/100 77/100
17 98022 Enumclaw WA 10/100 90/100
18 98023 Federal Way WA 10/100 86/100
19 98024 Fall City WA 10/100 85/100
20 98025 Hobart WA 10/100 66/100
21 98027 Issaquah WA 10/100 74/100
22 98028 Kenmore WA 10/100 82/100
23 98029 Issaquah WA 10/100 89/100
24 98030 Kent WA 10/100 95/100
25 98031 Kent WA 10/100 90/100
26 98032 Kent WA 10/100 90/100
27 98033 Kirkland WA 10/100 89/100
28 98034 Kirkland WA 10/100 89/100
29 98035 Kent WA 10/100 99/100
30 98038 Maple Valley WA 10/100 78/100
31 98039 Medina WA 10/100 73/100
32 98040 Mercer Island WA 10/100 87/100
33 98041 Bothell WA 10/100 85/100
34 98042 Kent WA 10/100 95/100
35 98045 North Bend WA 10/100 78/100
36 98047 Pacific WA 10/100 60/100
37 98050 Preston WA 10/100 73/100
38 98051 Ravensdale WA 10/100 98/100
39 98052 Redmond WA 10/100 88/100
40 98053 Redmond WA 10/100 93/100
41 98055 Renton WA 10/100 94/100
42 98056 Renton WA 10/100 94/100
43 98057 Renton WA 10/100 94/100
44 98058 Renton WA 10/100 84/100
45 98059 Renton WA 10/100 94/100
46 98062 Seahurst WA 10/100 66/100
47 98063 Federal Way WA 10/100 95/100
48 98064 Kent WA 10/100 99/100
49 98065 Snoqualmie WA 10/100 74/100
50 98070 Vashon WA 10/100 89/100
51 98071 Auburn WA 10/100 93/100
52 98072 Woodinville WA 10/100 89/100
53 98073 Redmond WA 10/100 97/100
54 98074 Sammamish WA 10/100 88/100
55 98075 Sammamish WA 10/100 88/100
56 98077 Woodinville WA 10/100 94/100
57 98083 Kirkland WA 10/100 94/100
58 98089 Kent WA 10/100 99/100
59 98092 Auburn WA 10/100 84/100
60 98093 Federal Way WA 10/100 95/100
61 98102 Seattle WA 10/100 95/100
62 98103 Seattle WA 10/100 95/100
63 98104 Seattle WA 10/100 95/100
64 98105 Seattle WA 10/100 95/100
65 98106 Seattle WA 10/100 90/100
66 98107 Seattle WA 10/100 95/100
67 98108 Seattle WA 10/100 90/100
68 98109 Seattle WA 10/100 95/100
69 98111 Seattle WA 10/100 99/100
70 98112 Seattle WA 10/100 90/100
71 98113 Seattle WA 10/100 99/100
72 98114 Seattle WA 10/100 99/100
73 98115 Seattle WA 10/100 90/100
74 98116 Seattle WA 10/100 90/100
75 98117 Seattle WA 10/100 90/100
76 98118 Seattle WA 10/100 95/100
77 98119 Seattle WA 10/100 95/100
78 98121 Seattle WA 10/100 95/100
79 98122 Seattle WA 10/100 95/100
80 98124 Seattle WA 10/100 99/100
81 98125 Seattle WA 10/100 90/100
82 98126 Seattle WA 10/100 90/100
83 98127 Seattle WA 10/100 99/100
84 98129 Seattle WA 10/100 99/100
85 98131 Seattle WA 10/100 99/100
86 98132 Seattle WA 10/100 99/100
87 98133 Seattle WA 10/100 90/100
88 98134 Seattle WA 10/100 99/100
89 98136 Seattle WA 10/100 90/100
90 98138 Seattle WA 10/100 99/100
91 98139 Seattle WA 10/100 99/100
92 98141 Seattle WA 10/100 99/100
93 98144 Seattle WA 10/100 95/100
94 98145 Seattle WA 10/100 99/100
95 98146 Seattle WA 10/100 90/100
96 98148 Seattle WA 10/100 95/100
97 98154 Seattle WA 10/100 99/100
98 98155 Seattle WA 10/100 90/100
99 98158 Seattle WA 10/100 99/100
100 98160 Seattle WA 10/100 99/100

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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