Highest Radon Risk ZIP Codes in Colorado — 2026

Out of 602 ZIP codes with data in Colorado, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All Colorado Rankings

Statistic	Value
ZIP codes ranked	602
Lowest value	Zone 1 (High)
Median value	Zone 1 (High)
State	Colorado

100 Lowest-Ranked ZIP Codes

Rank	ZIP Code	City	State	Radon Zone	Safety Score
1	80746	Paoli	CO	Zone 1 (High)	31/100
2	81030	Cheraw	CO	Zone 1 (High)	33/100
3	81047	Holly	CO	Zone 1 (High)	33/100
4	81058	Manzanola	CO	Zone 1 (High)	33/100
5	80536	Livermore	CO	Zone 1 (High)	34/100
6	81090	Walsh	CO	Zone 1 (High)	34/100
7	80540	Lyons	CO	Zone 1 (High)	35/100
8	81050	La Junta	CO	Zone 1 (High)	35/100
9	81044	Hasty	CO	Zone 1 (High)	37/100
10	80024	Dupont	CO	Zone 1 (High)	40/100
11	80131	Louviers	CO	Zone 1 (High)	40/100
12	80429	Climax	CO	Zone 1 (High)	40/100
13	80432	Como	CO	Zone 1 (High)	40/100
14	80434	Cowdrey	CO	Zone 1 (High)	40/100
15	80448	Grant	CO	Zone 1 (High)	40/100
16	80456	Jefferson	CO	Zone 1 (High)	40/100
17	80468	Parshall	CO	Zone 1 (High)	40/100
18	80471	Pinecliffe	CO	Zone 1 (High)	40/100
19	80473	Rand	CO	Zone 1 (High)	40/100
20	80475	Shawnee	CO	Zone 1 (High)	40/100
21	80533	Hygiene	CO	Zone 1 (High)	40/100
22	80535	Laporte	CO	Zone 1 (High)	40/100
23	80541	Masonville	CO	Zone 1 (High)	40/100
24	80612	Carr	CO	Zone 1 (High)	40/100
25	80729	Grover	CO	Zone 1 (High)	40/100
26	80732	Hereford	CO	Zone 1 (High)	40/100
27	80735	Idalia	CO	Zone 1 (High)	40/100
28	80740	Lindon	CO	Zone 1 (High)	40/100
29	80745	Padroni	CO	Zone 1 (High)	40/100
30	80754	Stoneham	CO	Zone 1 (High)	40/100
31	80755	Vernon	CO	Zone 1 (High)	40/100
32	80757	Woodrow	CO	Zone 1 (High)	40/100
33	80801	Anton	CO	Zone 1 (High)	40/100
34	80804	Arriba	CO	Zone 1 (High)	40/100
35	80812	Cope	CO	Zone 1 (High)	40/100
36	80820	Guffey	CO	Zone 1 (High)	40/100
37	80822	Joes	CO	Zone 1 (High)	40/100
38	80824	Kirk	CO	Zone 1 (High)	40/100
39	80825	Kit Carson	CO	Zone 1 (High)	40/100
40	80830	Matheson	CO	Zone 1 (High)	40/100
41	80833	Rush	CO	Zone 1 (High)	40/100
42	80840	U S A F Academy	CO	Zone 1 (High)	40/100
43	80841	U S A F Academy	CO	Zone 1 (High)	40/100
44	80862	Wild Horse	CO	Zone 1 (High)	40/100
45	81021	Arlington	CO	Zone 1 (High)	40/100
46	81024	Boncarbo	CO	Zone 1 (High)	40/100
47	81033	Crowley	CO	Zone 1 (High)	40/100
48	81034	Crowley	CO	Zone 1 (High)	40/100
49	81038	Fort Lyon	CO	Zone 1 (High)	40/100
50	81043	Hartman	CO	Zone 1 (High)	40/100
51	81046	Hoehne	CO	Zone 1 (High)	40/100
52	81057	Mc Clave	CO	Zone 1 (High)	40/100
53	81059	Model	CO	Zone 1 (High)	40/100
54	81069	Rye	CO	Zone 1 (High)	40/100
55	81081	Trinchera	CO	Zone 1 (High)	40/100
56	81091	Weston	CO	Zone 1 (High)	40/100
57	81121	Arboles	CO	Zone 1 (High)	40/100
58	81223	Cotopaxi	CO	Zone 1 (High)	40/100
59	81227	Monarch	CO	Zone 1 (High)	40/100
60	81228	Granite	CO	Zone 1 (High)	40/100
61	81232	Hillside	CO	Zone 1 (High)	40/100
62	81237	Ohio City	CO	Zone 1 (High)	40/100
63	81241	Pitkin	CO	Zone 1 (High)	40/100
64	81243	Powderhorn	CO	Zone 1 (High)	40/100
65	81248	Sargents	CO	Zone 1 (High)	40/100
66	81251	Twin Lakes	CO	Zone 1 (High)	40/100
67	81320	Cahone	CO	Zone 1 (High)	40/100
68	81325	Egnar	CO	Zone 1 (High)	40/100
69	81327	Lewis	CO	Zone 1 (High)	40/100
70	81329	Marvel	CO	Zone 1 (High)	40/100
71	81330	Mesa Verde National Park	CO	Zone 1 (High)	40/100
72	81331	Pleasant View	CO	Zone 1 (High)	40/100
73	81334	Towaoc	CO	Zone 1 (High)	40/100
74	81335	Yellow Jacket	CO	Zone 1 (High)	40/100
75	81411	Bedrock	CO	Zone 1 (High)	40/100
76	81414	Cory	CO	Zone 1 (High)	40/100
77	81420	Lazear	CO	Zone 1 (High)	40/100
78	81523	Glade Park	CO	Zone 1 (High)	40/100
79	81524	Loma	CO	Zone 1 (High)	40/100
80	81525	Mack	CO	Zone 1 (High)	40/100
81	81630	De Beque	CO	Zone 1 (High)	40/100
82	81636	Battlement Mesa	CO	Zone 1 (High)	40/100
83	81638	Hamilton	CO	Zone 1 (High)	40/100
84	81640	Maybell	CO	Zone 1 (High)	40/100
85	81646	Molina	CO	Zone 1 (High)	40/100
86	81432	Ridgway	CO	Zone 1 (High)	41/100
87	80439	Evergreen	CO	Zone 1 (High)	42/100
88	81089	Walsenburg	CO	Zone 1 (High)	44/100
89	80512	Bellvue	CO	Zone 1 (High)	45/100
90	80515	Drake	CO	Zone 1 (High)	45/100
91	80532	Glen Haven	CO	Zone 1 (High)	45/100
92	80645	La Salle	CO	Zone 1 (High)	45/100
93	80723	Brush	CO	Zone 1 (High)	45/100
94	80809	Cascade	CO	Zone 1 (High)	45/100
95	81023	Beulah	CO	Zone 1 (High)	45/100
96	81067	Rocky Ford	CO	Zone 1 (High)	45/100
97	81092	Wiley	CO	Zone 1 (High)	45/100
98	80818	Genoa	CO	Zone 1 (High)	46/100
99	81326	Hesperus	CO	Zone 1 (High)	46/100
100	81084	Two Buttes	CO	Zone 1 (High)	47/100

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%.