What does this radon potential ranking show?

It orders states by EPA radon potential zone. It is a comparison of this one published measure, not an overall ranking of where to live.

Where do these figures come from?

U.S. Environmental Protection Agency, Map of Radon Zones supplies this measure. States without a comparable published value are shown as not ranked rather than estimated.

How should I use this ranking?

Use it to narrow a search, then open a state or county profile for the underlying figures, source dates and caveats. A statewide number may not describe every neighbourhood.

Lowest radon potential by state

EPA radon potential zone.

This measure has no better end. The order describes the states, it does not rank them — see the other direction.

EPA county screening guidance, not a measurement for any individual home. Zone 1 is the highest potential and average indoor levels may exceed 4 pCi/L; Zone 2 is moderate, roughly 2–4 pCi/L; Zone 3 is lower, below 2 pCi/L. State profiles show the most-populous official county zone; the U.S. view shows the population-weighted share of residents in the selected zone. County shading identifies counties in that zone. EPA says all homes should be tested, regardless of zone.

How to read this ranking

Alaska has the lowest published radon potential in this comparison, at Zone 0. The next states shown are Arkansas (Zone 0) and Arizona (Zone 0).

The table orders 51 states by epa radon potential zone. It describes one published measure, not an overall judgment about where to live.

Use the result as a starting point, then compare the underlying source, dates, and local county figures before making a decision. EPA county screening guidance, not a measurement for any individual home. Zone 1 is the highest potential and average indoor levels may exceed 4 pCi/L; Zone 2 is moderate, roughly 2–4 pCi/L; Zone 3 is lower, below 2 pCi/L. State profiles show the most-populous official county zone; the U.S. view shows the population-weighted share of residents in the selected zone. County shading identifies counties in that zone. EPA says all homes should be tested, regardless of zone.

1AlaskaZone 0
2ArkansasZone 0
3ArizonaZone 0
4District of ColumbiaZone 0
5DelawareZone 0
6FloridaZone 0
7HawaiiZone 0
8LouisianaZone 0
9MississippiZone 0
10OklahomaZone 0
11OregonZone 0
12TexasZone 0
13VermontZone 0
14CaliforniaZone 3
15New HampshireZone 4
16UtahZone 4
17North CarolinaZone 6
18NevadaZone 6
19South CarolinaZone 10
20MichiganZone 12
21WashingtonZone 15
22MissouriZone 22
23AlabamaZone 23
24New YorkZone 23
25IdahoZone 24
26New JerseyZone 24
27IllinoisZone 27
28Rhode IslandZone 27
29GeorgiaZone 33
30West VirginiaZone 39
31WisconsinZone 42
32VirginiaZone 44
33New MexicoZone 45
34KentuckyZone 45
35MassachusettsZone 47
36TennesseeZone 52
37MarylandZone 52
38KansasZone 55
39OhioZone 63
40ConnecticutZone 67
41IndianaZone 72
42South DakotaZone 72
43PennsylvaniaZone 77
44MinnesotaZone 81
45NebraskaZone 83
46MontanaZone 84
47MaineZone 89
48WyomingZone 97
49ColoradoZone 98
50IowaZone 100
51North DakotaZone 100

Related place rankings

Frequently asked questions

What does this ranking show?: It orders states by EPA radon potential zone. It is one measure, not an overall verdict on where to live.
Where do the figures come from?: U.S. Environmental Protection Agency, Map of Radon Zones. States without a comparable published figure are listed as not ranked rather than estimated.
How should I use it?: Use it to narrow your search, then open a state or county profile for the source date, caveats and local context.

Put this map on your own site

Free to use. The chart names its source and links back, so it stays honest wherever it ends up.

<iframe src="https://movermath.com/embed/radon-potential" width="100%" height="420" style="border:0" loading="lazy" title="EPA radon potential zone by state"></iframe>

Source: U.S. Environmental Protection Agency, Map of Radon Zones. · How this is built

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