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 170 cities.

Updated October 19, 2026

Highest city

6.7pCi/L

Horse Shoe

North Carolina city average

2.4pCi/L

across 170 cities

Above action level

21/ 170

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	Banner Elk	5.1 pCi/L	1.3× over
7	Blowing Rock	4.9 pCi/L	1.2× over
8	Flat Rock	4.6 pCi/L	1.2× over
9	Advance	4.5 pCi/L	1.1× over
10	Norlina	4.5 pCi/L	1.1× over
11	Mountain Home	4.4 pCi/L	1.1× over
12	Black Mountain	4.4 pCi/L	1.1× over
13	Edneyville	4.3 pCi/L	1.1× over
14	West Jefferson	4.3 pCi/L	1.1× over
15	Lincolnton	4.2 pCi/L	1.1× over
16	Lowesville	4.2 pCi/L	1.1× over
17	Eden	4.2 pCi/L	1.1× over
18	Granite Falls	4.2 pCi/L	1.0× over
19	Murphy	4.2 pCi/L	1.0× over
20	Hendersonville	4.2 pCi/L	1.0× over
21	Sparta	4.1 pCi/L	1.0× over
✓ Below EPA action level (4 pCi/L)
22	Fletcher	4.0 pCi/L	1.0× under
23	Wilsons Mills	4.0 pCi/L	1.0× under
24	Enochville	3.9 pCi/L	1.0× under
25	Midway	3.9 pCi/L	1.0× under
26	Balfour	3.9 pCi/L	1.0× under
27	Foscoe	3.9 pCi/L	1.0× under
28	Fayetteville	3.8 pCi/L	1.0× under
29	Hayesville	3.7 pCi/L	0.9× under
30	Norwood	3.6 pCi/L	0.9× under
31	Waynesville	3.6 pCi/L	0.9× under
32	Burnsville	3.6 pCi/L	0.9× under
33	Zebulon	3.5 pCi/L	0.9× under
34	Brevard	3.5 pCi/L	0.9× under
35	Thurmond	3.5 pCi/L	0.9× under
36	Denver	3.4 pCi/L	0.8× under
37	East Flat Rock	3.3 pCi/L	0.8× under
38	Sherrills Ford	3.3 pCi/L	0.8× under
39	Boone	3.2 pCi/L	0.8× under
40	Spruce Pine	3.2 pCi/L	0.8× under
41	Oak Ridge	3.2 pCi/L	0.8× under
42	Mills River	3.1 pCi/L	0.8× under
43	Lewisville	3.0 pCi/L	0.8× under
44	Etowah	3.0 pCi/L	0.7× under
45	Northlakes	3.0 pCi/L	0.7× under
46	Winston-Salem	2.9 pCi/L	0.7× under
47	Swannanoa	2.9 pCi/L	0.7× under
48	Statesville	2.9 pCi/L	0.7× under
49	Mars Hill	2.9 pCi/L	0.7× under
50	Louisburg	2.8 pCi/L	0.7× under
51	Newland	2.8 pCi/L	0.7× under
52	Saint Stephens	2.8 pCi/L	0.7× under
53	Hillsborough	2.6 pCi/L	0.7× under
54	Royal Pines	2.6 pCi/L	0.7× under
55	Valley Hill	2.6 pCi/L	0.7× under
56	Laurel Park	2.6 pCi/L	0.6× under
57	Bethlehem	2.5 pCi/L	0.6× under
58	Hoopers Creek	2.5 pCi/L	0.6× under
59	Robbinsville	2.5 pCi/L	0.6× under
60	Reidsville	2.5 pCi/L	0.6× under
61	Wendell	2.5 pCi/L	0.6× under
62	Morganton	2.5 pCi/L	0.6× under
63	Hays	2.5 pCi/L	0.6× under
64	Clemmons	2.4 pCi/L	0.6× under
65	Summerfield	2.4 pCi/L	0.6× under
66	Waxhaw	2.4 pCi/L	0.6× under
67	Columbus	2.4 pCi/L	0.6× under
68	Dana	2.4 pCi/L	0.6× under
69	Asheboro	2.4 pCi/L	0.6× under
70	Claremont	2.4 pCi/L	0.6× under
71	Franklin	2.4 pCi/L	0.6× under
72	Avery Creek	2.4 pCi/L	0.6× under
73	Hickory	2.4 pCi/L	0.6× under
74	Woodfin	2.4 pCi/L	0.6× under
75	Cullowhee	2.4 pCi/L	0.6× under
76	Bryson City	2.3 pCi/L	0.6× under
77	Wake Forest	2.3 pCi/L	0.6× under
78	Southern Pines	2.3 pCi/L	0.6× under
79	Cornelius	2.3 pCi/L	0.6× under
80	Yadkinville	2.3 pCi/L	0.6× under
81	Troutman	2.3 pCi/L	0.6× under
82	Seven Lakes	2.3 pCi/L	0.6× under
83	Youngsville	2.3 pCi/L	0.6× under
84	Concord	2.3 pCi/L	0.6× under
85	Pittsboro	2.3 pCi/L	0.6× under
86	Sylva	2.2 pCi/L	0.6× under
87	Pumpkin Center	2.2 pCi/L	0.6× under
88	Biltmore Forest	2.2 pCi/L	0.5× under
89	Mooresville	2.2 pCi/L	0.5× under
90	Jefferson	2.1 pCi/L	0.5× under
91	Kannapolis	2.1 pCi/L	0.5× under
92	Bent Creek	2.1 pCi/L	0.5× under
93	Lake Lure	2.0 pCi/L	0.5× under
94	Bermuda Run	2.0 pCi/L	0.5× under
95	Fairview	2.0 pCi/L	0.5× under
96	Franklinton	2.0 pCi/L	0.5× under
97	Jamestown	2.0 pCi/L	0.5× under
98	Asheville	2.0 pCi/L	0.5× under
99	Trinity	1.9 pCi/L	0.5× under
100	Canton	1.9 pCi/L	0.5× under
101	Shelby	1.9 pCi/L	0.5× under
102	Davidson	1.9 pCi/L	0.5× under
103	Garner	1.9 pCi/L	0.5× under
104	Cove Creek	1.9 pCi/L	0.5× under
105	Clayton	1.9 pCi/L	0.5× under
106	Chapel Hill	1.9 pCi/L	0.5× under
107	Knightdale	1.9 pCi/L	0.5× under
108	Wesley Chapel	1.9 pCi/L	0.5× under
109	Kernersville	1.8 pCi/L	0.5× under
110	Granite Quarry	1.8 pCi/L	0.5× under
111	Lake Norman of Catawba	1.8 pCi/L	0.5× under
112	Lenoir	1.8 pCi/L	0.5× under
113	Marshall	1.8 pCi/L	0.5× under
114	Raleigh	1.8 pCi/L	0.5× under
115	West Raleigh	1.8 pCi/L	0.5× under
116	Rural Hall	1.8 pCi/L	0.4× under
117	Fearrington Village	1.8 pCi/L	0.4× under
118	Carrboro	1.7 pCi/L	0.4× under
119	West Marion	1.7 pCi/L	0.4× under
120	Charlotte	1.7 pCi/L	0.4× under
121	Hope Mills	1.7 pCi/L	0.4× under
122	Bakersville	1.7 pCi/L	0.4× under
123	Monroe	1.7 pCi/L	0.4× under
124	Weaverville	1.6 pCi/L	0.4× under
125	Belmont	1.6 pCi/L	0.4× under
126	Harrisburg	1.6 pCi/L	0.4× under
127	Tryon	1.6 pCi/L	0.4× under
128	Weddington	1.6 pCi/L	0.4× under
129	Westport	1.6 pCi/L	0.4× under
130	Holly Springs	1.5 pCi/L	0.4× under
131	Fuquay-Varina	1.5 pCi/L	0.4× under
132	Pineville	1.5 pCi/L	0.4× under
133	Rolesville	1.4 pCi/L	0.4× under
134	Mint Hill	1.4 pCi/L	0.4× under
135	Greensboro	1.4 pCi/L	0.3× under
136	Albemarle	1.4 pCi/L	0.3× under
137	Green Level	1.4 pCi/L	0.3× under
138	Archer Lodge	1.3 pCi/L	0.3× under
139	Apex	1.2 pCi/L	0.3× under
140	High Point	1.2 pCi/L	0.3× under
141	Huntersville	1.2 pCi/L	0.3× under
142	Matthews	1.2 pCi/L	0.3× under
143	Gorman	1.2 pCi/L	0.3× under
144	Cary	1.2 pCi/L	0.3× under
145	Durham	1.1 pCi/L	0.3× under
146	Sanford	1.1 pCi/L	0.3× under
147	Spring Hope	1.1 pCi/L	0.3× under
148	Mebane	1.1 pCi/L	0.3× under
149	Roxboro	1.1 pCi/L	0.3× under
150	Gastonia	1.1 pCi/L	0.3× under
151	Marvin	1.1 pCi/L	0.3× under
152	Mount Holly	1.1 pCi/L	0.3× under
153	Rutherfordton	1.1 pCi/L	0.3× under
154	Morrisville	1.0 pCi/L	0.2× under
155	Southmont	1.0 pCi/L	0.2× under
156	Creedmoor	1.0 pCi/L	0.2× under
157	Smithfield	1.0 pCi/L	0.2× under
158	Angier	0.9 pCi/L	0.2× under
159	Benson	0.9 pCi/L	0.2× under
160	Wallburg	0.9 pCi/L	0.2× under
161	Wilson	0.9 pCi/L	0.2× under
162	Midland	0.9 pCi/L	0.2× under
163	Stallings	0.8 pCi/L	0.2× under
164	South Henderson	0.7 pCi/L	0.2× under
165	Burlington	0.6 pCi/L	0.1× under
166	Boiling Spring Lakes	0.5 pCi/L	0.1× under
167	Moyock	0.4 pCi/L	0.1× under
168	Swansboro	0.4 pCi/L	0.1× under
169	Myrtle Grove	0.3 pCi/L	0.1× under
170	Silver Lake	0.3 pCi/L	0.1× under

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