2026 Rankings

Worst CO & Gas Risk ZIP Codes in Wisconsin — 2026

Last updated: June 4, 2026

271 ZIP codes ranked by Gas Risk Score #1: ZIP 54202 (Baileys Harbor, WI) — 21/100
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 271 ZIP codes with data in Wisconsin, these are the highest-ranked areas for gas risk score. See also: National ZIP Codes with Worst CO & Gas Safety Risk | All Wisconsin Rankings

Statistic Value
ZIP codes ranked 271
Highest value 21/100
Median value 2/100
State Wisconsin

Top 100 Worst ZIP Codes

Rank ZIP Code City State Gas Risk Score Safety Score
1 54202 Baileys Harbor WI 21/100 67/100
2 54204 Brussels WI 21/100 40/100
3 54209 Egg Harbor WI 21/100 67/100
4 54210 Ellison Bay WI 21/100 66/100
5 54211 Ephraim WI 21/100 40/100
6 54212 Fish Creek WI 21/100 53/100
7 54213 Forestville WI 21/100 53/100
8 54217 Luxemburg WI 21/100 70/100
9 54226 Maplewood WI 21/100 66/100
10 54234 Sister Bay WI 21/100 67/100
11 54235 Sturgeon Bay WI 21/100 59/100
12 54246 Washington Island WI 21/100 53/100
13 54003 Beldenville WI 7/100 53/100
14 54010 East Ellsworth WI 7/100 40/100
15 54011 Ellsworth WI 7/100 66/100
16 54014 Hager City WI 7/100 60/100
17 54021 Prescott WI 7/100 61/100
18 54723 Bay City WI 7/100 64/100
19 54740 Elmwood WI 7/100 63/100
20 54750 Maiden Rock WI 7/100 66/100
21 54761 Plum City WI 7/100 69/100
22 54767 Spring Valley WI 7/100 69/100
23 53508 Belleville WI 4/100 66/100
24 53515 Black Earth WI 4/100 64/100
25 53517 Blue Mounds WI 4/100 69/100
26 53521 Brooklyn WI 4/100 70/100
27 53527 Cottage Grove WI 4/100 69/100
28 53528 Cross Plains WI 4/100 60/100
29 53529 Dane WI 4/100 70/100
30 53531 Deerfield WI 4/100 64/100
31 53532 De Forest WI 4/100 45/100
32 53558 Mc Farland WI 4/100 70/100
33 53559 Marshall WI 4/100 70/100
34 53560 Mazomanie WI 4/100 64/100
35 53562 Middleton WI 4/100 63/100
36 53571 Morrisonville WI 4/100 66/100
37 53572 Mount Horeb WI 4/100 70/100
38 53575 Oregon WI 4/100 63/100
39 53583 Sauk City WI 4/100 57/100
40 53589 Stoughton WI 4/100 69/100
41 53590 Sun Prairie WI 4/100 64/100
42 53593 Verona WI 4/100 69/100
43 53596 Sun Prairie WI 4/100 65/100
44 53597 Waunakee WI 4/100 60/100
45 53598 Windsor WI 4/100 69/100
46 53701 Madison WI 4/100 59/100
47 53702 Madison WI 4/100 59/100
48 53703 Madison WI 4/100 59/100
49 53704 Madison WI 4/100 59/100
50 53705 Madison WI 4/100 64/100
51 53706 Madison WI 4/100 59/100
52 53707 Madison WI 4/100 59/100
53 53708 Madison WI 4/100 59/100
54 53711 Madison WI 4/100 59/100
55 53713 Madison WI 4/100 59/100
56 53714 Madison WI 4/100 64/100
57 53715 Madison WI 4/100 64/100
58 53716 Madison WI 4/100 59/100
59 53717 Madison WI 4/100 64/100
60 53718 Madison WI 4/100 59/100
61 53719 Madison WI 4/100 64/100
62 53725 Madison WI 4/100 59/100
63 53726 Madison WI 4/100 59/100
64 53744 Madison WI 4/100 59/100
65 53774 Madison WI 4/100 59/100
66 53777 Madison WI 4/100 59/100
67 53778 Madison WI 4/100 59/100
68 53779 Madison WI 4/100 59/100
69 53782 Madison WI 4/100 59/100
70 53783 Madison WI 4/100 59/100
71 53784 Madison WI 4/100 59/100
72 53785 Madison WI 4/100 59/100
73 53786 Madison WI 4/100 59/100
74 53788 Madison WI 4/100 59/100
75 53789 Madison WI 4/100 59/100
76 53790 Madison WI 4/100 59/100
77 53791 Madison WI 4/100 59/100
78 53792 Madison WI 4/100 59/100
79 53793 Madison WI 4/100 59/100
80 53794 Madison WI 4/100 59/100
81 53005 Brookfield WI 2/100 64/100
82 53007 Butler WI 2/100 67/100
83 53008 Brookfield WI 2/100 65/100
84 53017 Colgate WI 2/100 70/100
85 53018 Delafield WI 2/100 67/100
86 53029 Hartland WI 2/100 48/100
87 53045 Brookfield WI 2/100 64/100
88 53046 Lannon WI 2/100 64/100
89 53051 Menomonee Falls WI 2/100 58/100
90 53052 Menomonee Falls WI 2/100 64/100
91 53056 Merton WI 2/100 40/100
92 53058 Nashotah WI 2/100 70/100
93 53064 North Lake WI 2/100 69/100
94 53066 Oconomowoc WI 2/100 54/100
95 53069 Okauchee WI 2/100 66/100
96 53072 Pewaukee WI 2/100 40/100
97 53089 Sussex WI 2/100 66/100
98 53103 Big Bend WI 2/100 53/100
99 53110 Cudahy WI 2/100 73/100
100 53118 Dousman WI 2/100 63/100

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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