2026 Rankings

EPA Radon Zone 1 ZIP Codes in Ohio - 2026

Last updated: August 31, 2026

909 ZIP codes ranked by Radon Zone #1: ZIP 43137 (Lockbourne, OH) - Zone 1 (highest potential)
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 909 ZIP codes with data in Ohio, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes in EPA Radon Zone 1 | All Ohio Rankings

Statistic Value
ZIP codes ranked 909
Lowest value Zone 1 (highest potential)
Median value Zone 1 (highest potential)
State Ohio

100 Lowest-Ranked ZIP Codes

Rank ZIP Code City State Radon Zone Safety Score
1 43137 Lockbourne OH Zone 1 (highest potential) 25/100
2 43207 Columbus OH Zone 1 (highest potential) 25/100
3 43119 Galloway OH Zone 1 (highest potential) 28/100
4 43123 Grove City OH Zone 1 (highest potential) 32/100
5 43125 Groveport OH Zone 1 (highest potential) 32/100
6 43912 Bridgeport OH Zone 1 (highest potential) 33/100
7 43935 Martins Ferry OH Zone 1 (highest potential) 33/100
8 43950 Saint Clairsville OH Zone 1 (highest potential) 33/100
9 45011 Hamilton OH Zone 1 (highest potential) 33/100
10 45140 Loveland OH Zone 1 (highest potential) 35/100
11 45215 Cincinnati OH Zone 1 (highest potential) 35/100
12 43110 Canal Winchester OH Zone 1 (highest potential) 36/100
13 45030 Harrison OH Zone 1 (highest potential) 36/100
14 45042 Middletown OH Zone 1 (highest potential) 36/100
15 45236 Cincinnati OH Zone 1 (highest potential) 36/100
16 45237 Cincinnati OH Zone 1 (highest potential) 36/100
17 45002 Cleves OH Zone 1 (highest potential) 37/100
18 43206 Columbus OH Zone 1 (highest potential) 38/100
19 43215 Columbus OH Zone 1 (highest potential) 38/100
20 43228 Columbus OH Zone 1 (highest potential) 38/100
21 45001 Addyston OH Zone 1 (highest potential) 38/100
22 45052 North Bend OH Zone 1 (highest potential) 38/100
23 45107 Blanchester OH Zone 1 (highest potential) 38/100
24 45248 Cincinnati OH Zone 1 (highest potential) 38/100
25 44333 Akron OH Zone 1 (highest potential) 39/100
26 45013 Hamilton OH Zone 1 (highest potential) 39/100
27 45014 Fairfield OH Zone 1 (highest potential) 39/100
28 45015 Hamilton OH Zone 1 (highest potential) 39/100
29 43219 Columbus OH Zone 1 (highest potential) 40/100
30 43230 Columbus OH Zone 1 (highest potential) 40/100
31 45152 Morrow OH Zone 1 (highest potential) 40/100
32 45241 Cincinnati OH Zone 1 (highest potential) 40/100
33 45246 Cincinnati OH Zone 1 (highest potential) 40/100
34 45249 Cincinnati OH Zone 1 (highest potential) 40/100
35 45255 Cincinnati OH Zone 1 (highest potential) 40/100
36 43004 Blacklick OH Zone 1 (highest potential) 41/100
37 43016 Dublin OH Zone 1 (highest potential) 41/100
38 43017 Dublin OH Zone 1 (highest potential) 41/100
39 43054 New Albany OH Zone 1 (highest potential) 41/100
40 43209 Columbus OH Zone 1 (highest potential) 41/100
41 43213 Columbus OH Zone 1 (highest potential) 41/100
42 45069 West Chester OH Zone 1 (highest potential) 41/100
43 45231 Cincinnati OH Zone 1 (highest potential) 41/100
44 45242 Cincinnati OH Zone 1 (highest potential) 41/100
45 45244 Cincinnati OH Zone 1 (highest potential) 41/100
46 45309 Brookville OH Zone 1 (highest potential) 41/100
47 43002 Amlin OH Zone 1 (highest potential) 42/100
48 43026 Hilliard OH Zone 1 (highest potential) 42/100
49 43064 Plain City OH Zone 1 (highest potential) 42/100
50 43068 Reynoldsburg OH Zone 1 (highest potential) 42/100
51 43081 Westerville OH Zone 1 (highest potential) 42/100
52 43085 Columbus OH Zone 1 (highest potential) 42/100
53 43109 Brice OH Zone 1 (highest potential) 42/100
54 43201 Columbus OH Zone 1 (highest potential) 42/100
55 43202 Columbus OH Zone 1 (highest potential) 42/100
56 43203 Columbus OH Zone 1 (highest potential) 42/100
57 43204 Columbus OH Zone 1 (highest potential) 42/100
58 43205 Columbus OH Zone 1 (highest potential) 42/100
59 43210 Columbus OH Zone 1 (highest potential) 42/100
60 43211 Columbus OH Zone 1 (highest potential) 42/100
61 43212 Columbus OH Zone 1 (highest potential) 42/100
62 43214 Columbus OH Zone 1 (highest potential) 42/100
63 43217 Columbus OH Zone 1 (highest potential) 42/100
64 43218 Columbus OH Zone 1 (highest potential) 42/100
65 43220 Columbus OH Zone 1 (highest potential) 42/100
66 43221 Columbus OH Zone 1 (highest potential) 42/100
67 43222 Columbus OH Zone 1 (highest potential) 42/100
68 43223 Columbus OH Zone 1 (highest potential) 42/100
69 43224 Columbus OH Zone 1 (highest potential) 42/100
70 43227 Columbus OH Zone 1 (highest potential) 42/100
71 43229 Columbus OH Zone 1 (highest potential) 42/100
72 43231 Columbus OH Zone 1 (highest potential) 42/100
73 43232 Columbus OH Zone 1 (highest potential) 42/100
74 43235 Columbus OH Zone 1 (highest potential) 42/100
75 44236 Hudson OH Zone 1 (highest potential) 42/100
76 45041 Miamitown OH Zone 1 (highest potential) 42/100
77 45111 Camp Dennison OH Zone 1 (highest potential) 42/100
78 45174 Terrace Park OH Zone 1 (highest potential) 42/100
79 45202 Cincinnati OH Zone 1 (highest potential) 42/100
80 45203 Cincinnati OH Zone 1 (highest potential) 42/100
81 45204 Cincinnati OH Zone 1 (highest potential) 42/100
82 45205 Cincinnati OH Zone 1 (highest potential) 42/100
83 45206 Cincinnati OH Zone 1 (highest potential) 42/100
84 45207 Cincinnati OH Zone 1 (highest potential) 42/100
85 45208 Cincinnati OH Zone 1 (highest potential) 42/100
86 45209 Cincinnati OH Zone 1 (highest potential) 42/100
87 45211 Cincinnati OH Zone 1 (highest potential) 42/100
88 45212 Cincinnati OH Zone 1 (highest potential) 42/100
89 45213 Cincinnati OH Zone 1 (highest potential) 42/100
90 45214 Cincinnati OH Zone 1 (highest potential) 42/100
91 45216 Cincinnati OH Zone 1 (highest potential) 42/100
92 45217 Cincinnati OH Zone 1 (highest potential) 42/100
93 45218 Cincinnati OH Zone 1 (highest potential) 42/100
94 45219 Cincinnati OH Zone 1 (highest potential) 42/100
95 45220 Cincinnati OH Zone 1 (highest potential) 42/100
96 45223 Cincinnati OH Zone 1 (highest potential) 42/100
97 45224 Cincinnati OH Zone 1 (highest potential) 42/100
98 45225 Cincinnati OH Zone 1 (highest potential) 42/100
99 45226 Cincinnati OH Zone 1 (highest potential) 42/100
100 45227 Cincinnati OH Zone 1 (highest potential) 42/100

Methodology

This ranking is limited to EPA county-level radon zone classification. Zone 1 identifies the highest county-level potential category; it does not measure a home or establish whether any building is above an action level. Within Zone 1, ZIP codes are sub-ranked by Home Safety Score to organize area context.

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: 2026-08-31.

Frequently Asked Questions

What is EPA Radon Zone 1?

Zone 1 is the EPA highest county-level radon-potential category. It is not a measurement for a home and cannot determine whether a building is above an action level. A home test is required for that decision.

Should I test for radon?

The EPA recommends testing all homes regardless of radon zone. A DIY test kit costs $15-40. Professional testing costs $150-250. If levels exceed 4 pCi/L, mitigation systems ($800-2,500) can reduce radon by up to 99%.

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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