Missouri Cities Ranked by Indoor Radon Levels

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

Winfield has the highest measured indoor radon in Missouri at 9.1 pCi/L, based on Airthings measurements across 137 cities.

Updated October 19, 2026

Highest city

9.1pCi/L

Winfield

Missouri city average

3.1pCi/L

across 137 cities

Above action level

29/ 137

cities

Missouri Cities Ranked by Indoor Radon Levels
#	Location	Avg level	vs action level
1	Winfield	9.1 pCi/L	2.3× over
2	Greenwood	7.1 pCi/L	1.8× over
3	Platte City	6.9 pCi/L	1.7× over
4	Odessa	6.7 pCi/L	1.7× over
5	West Plains	6.6 pCi/L	1.6× over
6	Country Club Village	6.5 pCi/L	1.6× over
7	Festus	6.0 pCi/L	1.5× over
8	Farmington	5.9 pCi/L	1.5× over
9	Lake Lotawana	5.9 pCi/L	1.5× over
10	Lakeshire	5.9 pCi/L	1.5× over
11	Harrisonville	5.7 pCi/L	1.4× over
12	Fenton	5.6 pCi/L	1.4× over
13	Moscow Mills	5.3 pCi/L	1.3× over
14	Fulton	4.8 pCi/L	1.2× over
15	Sappington	4.8 pCi/L	1.2× over
16	Independence	4.7 pCi/L	1.2× over
17	Imperial	4.6 pCi/L	1.2× over
18	Pleasant Hill	4.5 pCi/L	1.1× over
19	Camdenton	4.5 pCi/L	1.1× over
20	Marlborough	4.5 pCi/L	1.1× over
21	Weston	4.5 pCi/L	1.1× over
22	Eureka	4.4 pCi/L	1.1× over
23	Troy	4.2 pCi/L	1.1× over
24	Wright City	4.2 pCi/L	1.0× over
25	Saint Paul	4.1 pCi/L	1.0× over
26	Gladstone	4.1 pCi/L	1.0× over
27	Saint Joseph	4.1 pCi/L	1.0× over
28	Belton	4.0 pCi/L	1.0× over
29	Blue Springs	4.0 pCi/L	1.0× over
✓ Below EPA action level (4 pCi/L)
30	Raymore	3.9 pCi/L	1.0× under
31	Rolla	3.9 pCi/L	1.0× under
32	Grain Valley	3.9 pCi/L	1.0× under
33	Shell Knob	3.8 pCi/L	1.0× under
34	Raytown	3.8 pCi/L	1.0× under
35	Wentzville	3.8 pCi/L	0.9× under
36	North Kansas City	3.8 pCi/L	0.9× under
37	Pacific	3.8 pCi/L	0.9× under
38	Black Jack	3.7 pCi/L	0.9× under
39	Weatherby Lake	3.6 pCi/L	0.9× under
40	Saint Peters	3.6 pCi/L	0.9× under
41	Byrnes Mill	3.5 pCi/L	0.9× under
42	Grandview	3.4 pCi/L	0.9× under
43	Warrenton	3.4 pCi/L	0.9× under
44	Peculiar	3.4 pCi/L	0.9× under
45	Manchester	3.4 pCi/L	0.8× under
46	East Independence	3.4 pCi/L	0.8× under
47	Lake Saint Louis	3.4 pCi/L	0.8× under
48	Springfield	3.4 pCi/L	0.8× under
49	Columbia	3.3 pCi/L	0.8× under
50	Excelsior Springs	3.3 pCi/L	0.8× under
51	Arnold	3.3 pCi/L	0.8× under
52	Murphy	3.3 pCi/L	0.8× under
53	Kirksville	3.3 pCi/L	0.8× under
54	Lees Summit	3.3 pCi/L	0.8× under
55	O'Fallon	3.3 pCi/L	0.8× under
56	Perryville	3.3 pCi/L	0.8× under
57	Kearney	3.2 pCi/L	0.8× under
58	Hillsboro	3.2 pCi/L	0.8× under
59	Hazelwood	3.2 pCi/L	0.8× under
60	Riverside	3.2 pCi/L	0.8× under
61	Oakville	3.1 pCi/L	0.8× under
62	Parkville	3.0 pCi/L	0.8× under
63	Chesterfield	3.0 pCi/L	0.8× under
64	Ballwin	3.0 pCi/L	0.7× under
65	Kimberling City	2.9 pCi/L	0.7× under
66	Town and Country	2.9 pCi/L	0.7× under
67	Marthasville	2.9 pCi/L	0.7× under
68	Richmond Heights	2.8 pCi/L	0.7× under
69	Oronogo	2.8 pCi/L	0.7× under
70	Wardsville	2.8 pCi/L	0.7× under
71	De Soto	2.8 pCi/L	0.7× under
72	Union	2.8 pCi/L	0.7× under
73	Wildwood	2.8 pCi/L	0.7× under
74	Willard	2.8 pCi/L	0.7× under
75	Ozark	2.7 pCi/L	0.7× under
76	Cottleville	2.7 pCi/L	0.7× under
77	Winchester	2.7 pCi/L	0.7× under
78	Neosho	2.7 pCi/L	0.7× under
79	Crystal City	2.7 pCi/L	0.7× under
80	Pleasant Valley	2.6 pCi/L	0.7× under
81	Liberty	2.6 pCi/L	0.6× under
82	St. Louis	2.6 pCi/L	0.6× under
83	Barnhart	2.6 pCi/L	0.6× under
84	Ellisville	2.5 pCi/L	0.6× under
85	Concord	2.5 pCi/L	0.6× under
86	Republic	2.4 pCi/L	0.6× under
87	Saint Charles	2.4 pCi/L	0.6× under
88	Maryland Heights	2.4 pCi/L	0.6× under
89	Sunset Hills	2.4 pCi/L	0.6× under
90	University City	2.4 pCi/L	0.6× under
91	Lake Winnebago	2.3 pCi/L	0.6× under
92	Strafford	2.3 pCi/L	0.6× under
93	Crestwood	2.3 pCi/L	0.6× under
94	Hanley Hills	2.2 pCi/L	0.6× under
95	Des Peres	2.2 pCi/L	0.6× under
96	Weldon Spring	2.1 pCi/L	0.5× under
97	Kansas City	2.1 pCi/L	0.5× under
98	Ashland	2.1 pCi/L	0.5× under
99	Ladue	2.1 pCi/L	0.5× under
100	Warrensburg	2.1 pCi/L	0.5× under
101	Clayton	2.1 pCi/L	0.5× under
102	Maplewood	2.1 pCi/L	0.5× under
103	Creve Coeur	2.0 pCi/L	0.5× under
104	Hollister	2.0 pCi/L	0.5× under
105	Frontenac	2.0 pCi/L	0.5× under
106	Cape Girardeau	2.0 pCi/L	0.5× under
107	Fair Grove	2.0 pCi/L	0.5× under
108	Jefferson City	2.0 pCi/L	0.5× under
109	Mehlville	2.0 pCi/L	0.5× under
110	High Ridge	1.9 pCi/L	0.5× under
111	Affton	1.9 pCi/L	0.5× under
112	Clarkson Valley	1.9 pCi/L	0.5× under
113	Olivette	1.9 pCi/L	0.5× under
114	Nixa	1.8 pCi/L	0.4× under
115	Clever	1.8 pCi/L	0.4× under
116	Dardenne Prairie	1.8 pCi/L	0.4× under
117	Rogersville	1.8 pCi/L	0.4× under
118	Sedalia	1.8 pCi/L	0.4× under
119	Florissant	1.7 pCi/L	0.4× under
120	Four Seasons	1.7 pCi/L	0.4× under
121	Battlefield	1.7 pCi/L	0.4× under
122	Webster Groves	1.7 pCi/L	0.4× under
123	Cedar Hill	1.7 pCi/L	0.4× under
124	Valley Park	1.7 pCi/L	0.4× under
125	Waynesville	1.7 pCi/L	0.4× under
126	Kirkwood	1.7 pCi/L	0.4× under
127	Carthage	1.6 pCi/L	0.4× under
128	Lemay	1.6 pCi/L	0.4× under
129	Brentwood	1.6 pCi/L	0.4× under
130	Hillsdale	1.6 pCi/L	0.4× under
131	Saint George	1.5 pCi/L	0.4× under
132	Smithville	1.4 pCi/L	0.3× under
133	Joplin	1.3 pCi/L	0.3× under
134	Jackson	1.1 pCi/L	0.3× under
135	Warson Woods	1.1 pCi/L	0.3× under
136	Merriam Woods	0.9 pCi/L	0.2× under
137	Poplar Bluff	0.9 pCi/L	0.2× under

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