2026 Rankings

Highest Radon Risk ZIP Codes in North Carolina — 2026

Last updated: June 4, 2026

80 ZIP codes ranked by Radon Zone #1: ZIP 28803 (Asheville, NC) — Zone 1 (High)
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 80 ZIP codes with data in North Carolina, these are the lowest-ranked areas for radon zone. See also: National ZIP Codes with Highest Radon Risk | All North Carolina Rankings

Statistic Value
ZIP codes ranked 80
Lowest value Zone 1 (High)
Median value Zone 1 (High)
State North Carolina

80 Lowest-Ranked ZIP Codes

Rank ZIP Code City State Radon Zone Safety Score
1 28803 Asheville NC Zone 1 (High) 20/100
2 28810 Asheville NC Zone 1 (High) 21/100
3 28815 Asheville NC Zone 1 (High) 21/100
4 28816 Asheville NC Zone 1 (High) 21/100
5 28801 Asheville NC Zone 1 (High) 25/100
6 28804 Asheville NC Zone 1 (High) 25/100
7 28805 Asheville NC Zone 1 (High) 25/100
8 28806 Asheville NC Zone 1 (High) 25/100
9 28802 Asheville NC Zone 1 (High) 35/100
10 28813 Asheville NC Zone 1 (High) 35/100
11 28814 Asheville NC Zone 1 (High) 35/100
12 27042 Pine Hall NC Zone 1 (High) 40/100
13 28623 Ennice NC Zone 1 (High) 40/100
14 28627 Glade Valley NC Zone 1 (High) 40/100
15 28683 Thurmond NC Zone 1 (High) 40/100
16 28685 Traphill NC Zone 1 (High) 40/100
17 28724 Dana NC Zone 1 (High) 40/100
18 28758 Mountain Home NC Zone 1 (High) 40/100
19 28760 Naples NC Zone 1 (High) 40/100
20 28778 Swannanoa NC Zone 1 (High) 40/100
21 28902 Brasstown NC Zone 1 (High) 40/100
22 28903 Culberson NC Zone 1 (High) 40/100
23 27375 Wentworth NC Zone 1 (High) 41/100
24 28692 Vilas NC Zone 1 (High) 45/100
25 28698 Zionville NC Zone 1 (High) 45/100
26 28790 Zirconia NC Zone 1 (High) 45/100
27 28906 Murphy NC Zone 1 (High) 45/100
28 27288 Eden NC Zone 1 (High) 47/100
29 28787 Weaverville NC Zone 1 (High) 50/100
30 27048 Stoneville NC Zone 1 (High) 51/100
31 28644 Laurel Springs NC Zone 1 (High) 53/100
32 28663 Piney Creek NC Zone 1 (High) 53/100
33 28701 Alexander NC Zone 1 (High) 53/100
34 28708 Balsam Grove NC Zone 1 (High) 53/100
35 28718 Cedar Mountain NC Zone 1 (High) 53/100
36 28726 East Flat Rock NC Zone 1 (High) 53/100
37 28728 Enka NC Zone 1 (High) 53/100
38 28735 Gerton NC Zone 1 (High) 53/100
39 28740 Green Mountain NC Zone 1 (High) 53/100
40 28742 Horse Shoe NC Zone 1 (High) 53/100
41 28766 Penrose NC Zone 1 (High) 53/100
42 28776 Skyland NC Zone 1 (High) 53/100
43 28781 Topton NC Zone 1 (High) 53/100
44 28607 Boone NC Zone 1 (High) 54/100
45 28732 Fletcher NC Zone 1 (High) 54/100
46 28770 Ridgecrest NC Zone 1 (High) 54/100
47 27322 Reidsville NC Zone 1 (High) 55/100
48 28684 Todd NC Zone 1 (High) 55/100
49 28727 Edneyville NC Zone 1 (High) 55/100
50 28731 Flat Rock NC Zone 1 (High) 55/100
51 28777 Spruce Pine NC Zone 1 (High) 55/100
52 27025 Madison NC Zone 1 (High) 56/100
53 28605 Blowing Rock NC Zone 1 (High) 56/100
54 28705 Bakersville NC Zone 1 (High) 56/100
55 28730 Fairview NC Zone 1 (High) 56/100
56 28739 Hendersonville NC Zone 1 (High) 56/100
57 28792 Hendersonville NC Zone 1 (High) 56/100
58 27289 Eden NC Zone 1 (High) 57/100
59 28711 Black Mountain NC Zone 1 (High) 58/100
60 28712 Brevard NC Zone 1 (High) 58/100
61 28772 Rosman NC Zone 1 (High) 58/100
62 28668 Roaring Gap NC Zone 1 (High) 59/100
63 28715 Candler NC Zone 1 (High) 59/100
64 28704 Arden NC Zone 1 (High) 60/100
65 27027 Mayodan NC Zone 1 (High) 61/100
66 27320 Reidsville NC Zone 1 (High) 61/100
67 28791 Hendersonville NC Zone 1 (High) 61/100
68 28759 Mills River NC Zone 1 (High) 62/100
69 28765 Penland NC Zone 1 (High) 63/100
70 28768 Pisgah Forest NC Zone 1 (High) 64/100
71 28784 Tuxedo NC Zone 1 (High) 65/100
72 28901 Andrews NC Zone 1 (High) 65/100
73 28793 Hendersonville NC Zone 1 (High) 66/100
74 28748 Leicester NC Zone 1 (High) 67/100
75 28729 Etowah NC Zone 1 (High) 68/100
76 28905 Marble NC Zone 1 (High) 68/100
77 28608 Boone NC Zone 1 (High) 69/100
78 28675 Sparta NC Zone 1 (High) 69/100
79 28747 Lake Toxaway NC Zone 1 (High) 69/100
80 28757 Montreat NC Zone 1 (High) 69/100

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%.

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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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