North Carolina Cities Ranked by Indoor Radon Levels

Measured averages from Airthings devices across North Carolina, USA. Action level: 4 pCi/L — the threshold at which remediation is recommended.

Horse Shoe has the highest measured indoor radon in North Carolina at 6.7 pCi/L, based on Airthings measurements across 140 cities.

Updated August 16, 2026

Highest city

6.7pCi/L

Horse Shoe

North Carolina city average

2.5pCi/L

across 140 cities

Above action level

20/ 140

cities

North Carolina Cities Ranked by Indoor Radon Levels
#	Location	Avg level	Monitors	vs action level
1	Horse Shoe	6.7 pCi/L	7	1.7× over
2	Andrews	6.1 pCi/L	6	1.5× over
3	South Rosemary	5.6 pCi/L	7	1.4× over
4	Maggie Valley	5.5 pCi/L	8	1.4× over
5	Blowing Rock	4.9 pCi/L	36	1.2× over
6	Wilsons Mills	4.8 pCi/L	10	1.2× over
7	Advance	4.8 pCi/L	11	1.2× over
8	Lowesville	4.8 pCi/L	6	1.2× over
9	Banner Elk	4.7 pCi/L	27	1.2× over
10	Flat Rock	4.6 pCi/L	21	1.2× over
11	Norlina	4.5 pCi/L	6	1.1× over
12	Black Mountain	4.4 pCi/L	29	1.1× over
13	Mountain Home	4.4 pCi/L	11	1.1× over
14	Edneyville	4.3 pCi/L	13	1.1× over
15	West Jefferson	4.3 pCi/L	8	1.1× over
16	Midway	4.2 pCi/L	7	1.1× over
17	Eden	4.2 pCi/L	8	1.1× over
18	Murphy	4.2 pCi/L	27	1.0× over
19	Sparta	4.1 pCi/L	8	1.0× over
20	Foscoe	4.0 pCi/L	17	1.0× over
✓ Below EPA action level (4 pCi/L)
21	Fletcher	4.0 pCi/L	10	1.0× under
22	Hayesville	3.9 pCi/L	8	1.0× under
23	Hendersonville	3.9 pCi/L	13	1.0× under
24	Fayetteville	3.8 pCi/L	6	1.0× under
25	East Flat Rock	3.6 pCi/L	7	0.9× under
26	Burnsville	3.6 pCi/L	10	0.9× under
27	Zebulon	3.5 pCi/L	14	0.9× under
28	Brevard	3.5 pCi/L	51	0.9× under
29	Sherrills Ford	3.4 pCi/L	11	0.9× under
30	Denver	3.4 pCi/L	22	0.8× under
31	Boone	3.4 pCi/L	51	0.8× under
32	Spruce Pine	3.3 pCi/L	11	0.8× under
33	Oak Ridge	3.2 pCi/L	18	0.8× under
34	Mills River	3.1 pCi/L	12	0.8× under
35	Lewisville	3.0 pCi/L	39	0.8× under
36	Winston-Salem	3.0 pCi/L	37	0.8× under
37	Etowah	3.0 pCi/L	17	0.7× under
38	Northlakes	3.0 pCi/L	8	0.7× under
39	Statesville	2.9 pCi/L	10	0.7× under
40	Swannanoa	2.9 pCi/L	13	0.7× under
41	Mars Hill	2.9 pCi/L	11	0.7× under
42	Louisburg	2.8 pCi/L	20	0.7× under
43	Hillsborough	2.8 pCi/L	29	0.7× under
44	Newland	2.8 pCi/L	9	0.7× under
45	Cornelius	2.6 pCi/L	7	0.7× under
46	Laurel Park	2.6 pCi/L	15	0.7× under
47	Royal Pines	2.6 pCi/L	18	0.7× under
48	Franklin	2.6 pCi/L	21	0.6× under
49	Asheboro	2.5 pCi/L	6	0.6× under
50	Robbinsville	2.5 pCi/L	8	0.6× under
51	Waxhaw	2.5 pCi/L	35	0.6× under
52	Morganton	2.5 pCi/L	8	0.6× under
53	Clemmons	2.5 pCi/L	18	0.6× under
54	Cullowhee	2.5 pCi/L	25	0.6× under
55	Hays	2.5 pCi/L	6	0.6× under
56	Summerfield	2.5 pCi/L	37	0.6× under
57	Columbus	2.4 pCi/L	8	0.6× under
58	Dana	2.4 pCi/L	13	0.6× under
59	Sylva	2.4 pCi/L	7	0.6× under
60	Avery Creek	2.4 pCi/L	15	0.6× under
61	Hickory	2.4 pCi/L	17	0.6× under
62	Valley Hill	2.4 pCi/L	11	0.6× under
63	Bryson City	2.3 pCi/L	10	0.6× under
64	Reidsville	2.3 pCi/L	8	0.6× under
65	Troutman	2.3 pCi/L	11	0.6× under
66	Southern Pines	2.3 pCi/L	11	0.6× under
67	Woodfin	2.3 pCi/L	35	0.6× under
68	Wake Forest	2.3 pCi/L	127	0.6× under
69	Yadkinville	2.3 pCi/L	6	0.6× under
70	Concord	2.3 pCi/L	24	0.6× under
71	Seven Lakes	2.3 pCi/L	6	0.6× under
72	Youngsville	2.3 pCi/L	19	0.6× under
73	Pittsboro	2.3 pCi/L	12	0.6× under
74	Pumpkin Center	2.2 pCi/L	6	0.6× under
75	Mooresville	2.2 pCi/L	54	0.5× under
76	Bent Creek	2.1 pCi/L	37	0.5× under
77	Claremont	2.1 pCi/L	8	0.5× under
78	Lake Lure	2.0 pCi/L	6	0.5× under
79	Wesley Chapel	2.0 pCi/L	7	0.5× under
80	Asheville	2.0 pCi/L	110	0.5× under
81	Fairview	2.0 pCi/L	13	0.5× under
82	Biltmore Forest	2.0 pCi/L	18	0.5× under
83	Franklinton	2.0 pCi/L	15	0.5× under
84	Jamestown	2.0 pCi/L	7	0.5× under
85	Jefferson	2.0 pCi/L	14	0.5× under
86	Shelby	2.0 pCi/L	6	0.5× under
87	Trinity	1.9 pCi/L	6	0.5× under
88	Chapel Hill	1.9 pCi/L	66	0.5× under
89	Garner	1.9 pCi/L	62	0.5× under
90	Lake Norman of Catawba	1.9 pCi/L	19	0.5× under
91	Canton	1.9 pCi/L	6	0.5× under
92	Raleigh	1.9 pCi/L	143	0.5× under
93	Wendell	1.9 pCi/L	24	0.5× under
94	Kernersville	1.8 pCi/L	18	0.5× under
95	Knightdale	1.8 pCi/L	45	0.5× under
96	West Raleigh	1.8 pCi/L	271	0.5× under
97	Lenoir	1.8 pCi/L	6	0.5× under
98	Carrboro	1.8 pCi/L	48	0.4× under
99	Clayton	1.8 pCi/L	20	0.4× under
100	Fearrington Village	1.8 pCi/L	44	0.4× under
101	Davidson	1.7 pCi/L	16	0.4× under
102	Hope Mills	1.7 pCi/L	6	0.4× under
103	Charlotte	1.7 pCi/L	128	0.4× under
104	Monroe	1.7 pCi/L	12	0.4× under
105	Weddington	1.6 pCi/L	23	0.4× under
106	Weaverville	1.6 pCi/L	18	0.4× under
107	Tryon	1.6 pCi/L	7	0.4× under
108	Westport	1.6 pCi/L	15	0.4× under
109	Harrisburg	1.6 pCi/L	30	0.4× under
110	Holly Springs	1.5 pCi/L	62	0.4× under
111	Belmont	1.5 pCi/L	13	0.4× under
112	Fuquay-Varina	1.5 pCi/L	43	0.4× under
113	Mint Hill	1.4 pCi/L	18	0.4× under
114	Pineville	1.4 pCi/L	28	0.3× under
115	Archer Lodge	1.4 pCi/L	11	0.3× under
116	Green Level	1.4 pCi/L	131	0.3× under
117	Rolesville	1.3 pCi/L	44	0.3× under
118	Greensboro	1.3 pCi/L	28	0.3× under
119	Apex	1.2 pCi/L	76	0.3× under
120	High Point	1.2 pCi/L	7	0.3× under
121	Huntersville	1.2 pCi/L	46	0.3× under
122	Sanford	1.2 pCi/L	8	0.3× under
123	Cary	1.2 pCi/L	109	0.3× under
124	Durham	1.2 pCi/L	126	0.3× under
125	Matthews	1.1 pCi/L	44	0.3× under
126	Roxboro	1.1 pCi/L	9	0.3× under
127	Gorman	1.1 pCi/L	26	0.3× under
128	Gastonia	1.1 pCi/L	6	0.3× under
129	Marvin	1.0 pCi/L	44	0.3× under
130	Angier	1.0 pCi/L	10	0.2× under
131	Creedmoor	1.0 pCi/L	16	0.2× under
132	Morrisville	1.0 pCi/L	44	0.2× under
133	Smithfield	1.0 pCi/L	6	0.2× under
134	Benson	0.9 pCi/L	11	0.2× under
135	Wallburg	0.9 pCi/L	8	0.2× under
136	Midland	0.9 pCi/L	8	0.2× under
137	Stallings	0.8 pCi/L	7	0.2× under
138	Burlington	0.6 pCi/L	8	0.1× under
139	Boiling Spring Lakes	0.5 pCi/L	6	0.1× under
140	Myrtle Grove	0.3 pCi/L	7	0.1× under

See USA cities ranked by radon level See all States ranked by radon level