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 163 cities.

Updated August 30, 2026

Highest city

6.7pCi/L

Horse Shoe

North Carolina city average

2.4pCi/L

across 163 cities

Above action level

23/ 163

cities

North Carolina Cities Ranked by Indoor Radon Levels
#	Location	Avg level	vs action level
1	Horse Shoe	6.7 pCi/L	1.7× over
2	Andrews	6.1 pCi/L	1.5× over
3	Hildebran	5.8 pCi/L	1.5× over
4	South Rosemary	5.6 pCi/L	1.4× over
5	Maggie Valley	5.5 pCi/L	1.4× over
6	Blowing Rock	4.9 pCi/L	1.2× over
7	Wilsons Mills	4.8 pCi/L	1.2× over
8	Advance	4.8 pCi/L	1.2× over
9	Lowesville	4.8 pCi/L	1.2× over
10	Banner Elk	4.7 pCi/L	1.2× over
11	Flat Rock	4.6 pCi/L	1.2× over
12	Norlina	4.5 pCi/L	1.1× over
13	Black Mountain	4.4 pCi/L	1.1× over
14	Mountain Home	4.4 pCi/L	1.1× over
15	Edneyville	4.3 pCi/L	1.1× over
16	West Jefferson	4.3 pCi/L	1.1× over
17	Lincolnton	4.2 pCi/L	1.1× over
18	Midway	4.2 pCi/L	1.1× over
19	Eden	4.2 pCi/L	1.1× over
20	Granite Falls	4.2 pCi/L	1.0× over
21	Murphy	4.2 pCi/L	1.0× over
22	Sparta	4.1 pCi/L	1.0× over
23	Foscoe	4.0 pCi/L	1.0× over
✓ Below EPA action level (4 pCi/L)
24	Fletcher	4.0 pCi/L	1.0× under
25	Hayesville	3.9 pCi/L	1.0× under
26	Hendersonville	3.9 pCi/L	1.0× under
27	Fayetteville	3.8 pCi/L	1.0× under
28	Waynesville	3.8 pCi/L	0.9× under
29	Norwood	3.6 pCi/L	0.9× under
30	Burnsville	3.6 pCi/L	0.9× under
31	East Flat Rock	3.6 pCi/L	0.9× under
32	Zebulon	3.5 pCi/L	0.9× under
33	Brevard	3.5 pCi/L	0.9× under
34	Thurmond	3.5 pCi/L	0.9× under
35	Sherrills Ford	3.4 pCi/L	0.9× under
36	Denver	3.4 pCi/L	0.8× under
37	Boone	3.4 pCi/L	0.8× under
38	Spruce Pine	3.3 pCi/L	0.8× under
39	Oak Ridge	3.2 pCi/L	0.8× under
40	Mills River	3.1 pCi/L	0.8× under
41	Lewisville	3.0 pCi/L	0.8× under
42	Winston-Salem	3.0 pCi/L	0.8× under
43	Etowah	3.0 pCi/L	0.7× under
44	Northlakes	3.0 pCi/L	0.7× under
45	Statesville	2.9 pCi/L	0.7× under
46	Swannanoa	2.9 pCi/L	0.7× under
47	Mars Hill	2.9 pCi/L	0.7× under
48	Louisburg	2.8 pCi/L	0.7× under
49	Newland	2.8 pCi/L	0.7× under
50	Saint Stephens	2.8 pCi/L	0.7× under
51	Hillsborough	2.7 pCi/L	0.7× under
52	Hoopers Creek	2.7 pCi/L	0.7× under
53	Cornelius	2.6 pCi/L	0.7× under
54	Laurel Park	2.6 pCi/L	0.7× under
55	Royal Pines	2.6 pCi/L	0.7× under
56	Franklin	2.6 pCi/L	0.6× under
57	Asheboro	2.5 pCi/L	0.6× under
58	Bethlehem	2.5 pCi/L	0.6× under
59	Robbinsville	2.5 pCi/L	0.6× under
60	Waxhaw	2.5 pCi/L	0.6× under
61	Morganton	2.5 pCi/L	0.6× under
62	Clemmons	2.5 pCi/L	0.6× under
63	Cullowhee	2.5 pCi/L	0.6× under
64	Hays	2.5 pCi/L	0.6× under
65	Summerfield	2.5 pCi/L	0.6× under
66	Columbus	2.4 pCi/L	0.6× under
67	Dana	2.4 pCi/L	0.6× under
68	Sylva	2.4 pCi/L	0.6× under
69	Avery Creek	2.4 pCi/L	0.6× under
70	Hickory	2.4 pCi/L	0.6× under
71	Valley Hill	2.4 pCi/L	0.6× under
72	Bryson City	2.3 pCi/L	0.6× under
73	Reidsville	2.3 pCi/L	0.6× under
74	Troutman	2.3 pCi/L	0.6× under
75	Southern Pines	2.3 pCi/L	0.6× under
76	Woodfin	2.3 pCi/L	0.6× under
77	Wake Forest	2.3 pCi/L	0.6× under
78	Yadkinville	2.3 pCi/L	0.6× under
79	Concord	2.3 pCi/L	0.6× under
80	Seven Lakes	2.3 pCi/L	0.6× under
81	Youngsville	2.3 pCi/L	0.6× under
82	Pittsboro	2.3 pCi/L	0.6× under
83	Pumpkin Center	2.2 pCi/L	0.6× under
84	Mooresville	2.2 pCi/L	0.5× under
85	Jefferson	2.1 pCi/L	0.5× under
86	Kannapolis	2.1 pCi/L	0.5× under
87	Bent Creek	2.1 pCi/L	0.5× under
88	Claremont	2.1 pCi/L	0.5× under
89	Lake Lure	2.0 pCi/L	0.5× under
90	Wesley Chapel	2.0 pCi/L	0.5× under
91	Asheville	2.0 pCi/L	0.5× under
92	Fairview	2.0 pCi/L	0.5× under
93	Biltmore Forest	2.0 pCi/L	0.5× under
94	Franklinton	2.0 pCi/L	0.5× under
95	Jamestown	2.0 pCi/L	0.5× under
96	Shelby	2.0 pCi/L	0.5× under
97	Trinity	1.9 pCi/L	0.5× under
98	Chapel Hill	1.9 pCi/L	0.5× under
99	Bermuda Run	1.9 pCi/L	0.5× under
100	Garner	1.9 pCi/L	0.5× under
101	Lake Norman of Catawba	1.9 pCi/L	0.5× under
102	Canton	1.9 pCi/L	0.5× under
103	Raleigh	1.9 pCi/L	0.5× under
104	Wendell	1.9 pCi/L	0.5× under
105	Kernersville	1.8 pCi/L	0.5× under
106	Knightdale	1.8 pCi/L	0.5× under
107	West Raleigh	1.8 pCi/L	0.5× under
108	Granite Quarry	1.8 pCi/L	0.5× under
109	Lenoir	1.8 pCi/L	0.5× under
110	Carrboro	1.8 pCi/L	0.5× under
111	Clayton	1.8 pCi/L	0.4× under
112	Rural Hall	1.8 pCi/L	0.4× under
113	Fearrington Village	1.8 pCi/L	0.4× under
114	Davidson	1.7 pCi/L	0.4× under
115	West Marion	1.7 pCi/L	0.4× under
116	Hope Mills	1.7 pCi/L	0.4× under
117	Charlotte	1.7 pCi/L	0.4× under
118	Monroe	1.7 pCi/L	0.4× under
119	Weddington	1.6 pCi/L	0.4× under
120	Weaverville	1.6 pCi/L	0.4× under
121	Tryon	1.6 pCi/L	0.4× under
122	Westport	1.6 pCi/L	0.4× under
123	Harrisburg	1.6 pCi/L	0.4× under
124	Holly Springs	1.5 pCi/L	0.4× under
125	Belmont	1.5 pCi/L	0.4× under
126	Fuquay-Varina	1.5 pCi/L	0.4× under
127	Pineville	1.4 pCi/L	0.4× under
128	Mint Hill	1.4 pCi/L	0.4× under
129	Archer Lodge	1.4 pCi/L	0.3× under
130	Albemarle	1.4 pCi/L	0.3× under
131	Green Level	1.4 pCi/L	0.3× under
132	Rolesville	1.3 pCi/L	0.3× under
133	Greensboro	1.3 pCi/L	0.3× under
134	Apex	1.2 pCi/L	0.3× under
135	High Point	1.2 pCi/L	0.3× under
136	Huntersville	1.2 pCi/L	0.3× under
137	Sanford	1.2 pCi/L	0.3× under
138	Cary	1.2 pCi/L	0.3× under
139	Durham	1.2 pCi/L	0.3× under
140	Spring Hope	1.1 pCi/L	0.3× under
141	Matthews	1.1 pCi/L	0.3× under
142	Roxboro	1.1 pCi/L	0.3× under
143	Gorman	1.1 pCi/L	0.3× under
144	Gastonia	1.1 pCi/L	0.3× under
145	Marvin	1.0 pCi/L	0.3× under
146	Morrisville	1.0 pCi/L	0.2× under
147	Southmont	1.0 pCi/L	0.2× under
148	Angier	1.0 pCi/L	0.2× under
149	Creedmoor	1.0 pCi/L	0.2× under
150	Smithfield	1.0 pCi/L	0.2× under
151	Mount Holly	0.9 pCi/L	0.2× under
152	Rutherfordton	0.9 pCi/L	0.2× under
153	Benson	0.9 pCi/L	0.2× under
154	Wallburg	0.9 pCi/L	0.2× under
155	Midland	0.9 pCi/L	0.2× under
156	Stallings	0.8 pCi/L	0.2× under
157	South Henderson	0.7 pCi/L	0.2× under
158	Burlington	0.6 pCi/L	0.1× under
159	Boiling Spring Lakes	0.5 pCi/L	0.1× under
160	Moyock	0.4 pCi/L	0.1× under
161	Swansboro	0.4 pCi/L	0.1× under
162	Myrtle Grove	0.3 pCi/L	0.1× under
163	Silver Lake	0.3 pCi/L	0.1× under

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