Highest Radon Risk ZIP Codes in Utah — 2026

Out of 62 ZIP codes with data in Utah, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All Utah Rankings

Statistic	Value
ZIP codes ranked	62
Lowest value	Zone 1 (High)
Median value	Zone 1 (High)
State	Utah

62 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Radon Zone	Safety Score
1	84002	Altonah	UT	Zone 1 (High)	40/100
2	84007	Bluebell	UT	Zone 1 (High)	40/100
3	84008	Bonanza	UT	Zone 1 (High)	40/100
4	84026	Fort Duchesne	UT	Zone 1 (High)	40/100
5	84031	Hanna	UT	Zone 1 (High)	40/100
6	84039	Lapoint	UT	Zone 1 (High)	40/100
7	84051	Mountain Home	UT	Zone 1 (High)	40/100
8	84085	Whiterocks	UT	Zone 1 (High)	40/100
9	84515	Cisco	UT	Zone 1 (High)	40/100
10	84529	Kenilworth	UT	Zone 1 (High)	40/100
11	84539	Sunnyside	UT	Zone 1 (High)	40/100
12	84623	Chester	UT	Zone 1 (High)	40/100
13	84646	Moroni	UT	Zone 1 (High)	40/100
14	84766	Sevier	UT	Zone 1 (High)	40/100
15	84657	Sigurd	UT	Zone 1 (High)	47/100
16	84744	Koosharem	UT	Zone 1 (High)	50/100
17	84522	Emery	UT	Zone 1 (High)	53/100
18	84723	Circleville	UT	Zone 1 (High)	53/100
19	84620	Aurora	UT	Zone 1 (High)	54/100
20	84632	Fountain Green	UT	Zone 1 (High)	54/100
21	84621	Axtell	UT	Zone 1 (High)	56/100
22	84076	Tridell	UT	Zone 1 (High)	59/100
23	84630	Fayette	UT	Zone 1 (High)	60/100
24	84027	Fruitland	UT	Zone 1 (High)	61/100
25	84072	Tabiona	UT	Zone 1 (High)	61/100
26	84732	Greenwich	UT	Zone 1 (High)	61/100
27	84654	Salina	UT	Zone 1 (High)	62/100
28	84743	Kingston	UT	Zone 1 (High)	62/100
29	84532	Moab	UT	Zone 1 (High)	63/100
30	84713	Beaver	UT	Zone 1 (High)	63/100
31	84073	Talmage	UT	Zone 1 (High)	64/100
32	84652	Redmond	UT	Zone 1 (High)	64/100
33	84079	Vernal	UT	Zone 1 (High)	65/100
34	84520	East Carbon	UT	Zone 1 (High)	65/100
35	84622	Centerfield	UT	Zone 1 (High)	65/100
36	84665	Sterling	UT	Zone 1 (High)	65/100
37	84750	Marysvale	UT	Zone 1 (High)	65/100
38	84052	Myton	UT	Zone 1 (High)	66/100
39	84053	Neola	UT	Zone 1 (High)	66/100
40	84063	Randlett	UT	Zone 1 (High)	66/100
41	84643	Mayfield	UT	Zone 1 (High)	66/100
42	84724	Elsinore	UT	Zone 1 (High)	66/100
43	84730	Glenwood	UT	Zone 1 (High)	66/100
44	84740	Junction	UT	Zone 1 (High)	66/100
45	84001	Altamont	UT	Zone 1 (High)	68/100
46	84021	Duchesne	UT	Zone 1 (High)	68/100
47	84066	Roosevelt	UT	Zone 1 (High)	68/100
48	84501	Price	UT	Zone 1 (High)	68/100
49	84642	Manti	UT	Zone 1 (High)	68/100
50	84739	Joseph	UT	Zone 1 (High)	68/100
51	84754	Monroe	UT	Zone 1 (High)	68/100
52	84078	Vernal	UT	Zone 1 (High)	69/100
53	84662	Spring City	UT	Zone 1 (High)	69/100
54	84035	Jensen	UT	Zone 1 (High)	70/100
55	84526	Helper	UT	Zone 1 (High)	70/100
56	84542	Wellington	UT	Zone 1 (High)	70/100
57	84627	Ephraim	UT	Zone 1 (High)	70/100
58	84629	Fairview	UT	Zone 1 (High)	70/100
59	84647	Mount Pleasant	UT	Zone 1 (High)	70/100
60	84667	Wales	UT	Zone 1 (High)	70/100
61	84701	Richfield	UT	Zone 1 (High)	70/100
62	84711	Annabella	UT	Zone 1 (High)	70/100

Methodology

Radon rankings are based on EPA county-level radon zone classifications. Zone 1 (highest risk) has predicted average indoor radon levels above 4 pCi/L — the EPA action level. Zone 2 is moderate (2-4 pCi/L) and Zone 3 is low (below 2 pCi/L). Within Zone 1, ZIP codes are sub-ranked by Home Safety Score to prioritize areas with compounding risk factors.

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 EPA Radon Zone 1?

Zone 1 is the EPA highest-risk classification, meaning the county has predicted average indoor radon levels above 4 pCi/L — the level at which the EPA recommends mitigation. Radon causes about 21,000 lung cancer deaths per year in the U.S.

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%.