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 132 cities.

Updated August 30, 2026

Highest city

9.1pCi/L

Winfield

Missouri city average

3.1pCi/L

across 132 cities

Above action level

27/ 132

cities

Missouri Cities Ranked by Indoor Radon Levels
#	Location	Avg level	vs action level
1	Winfield	9.1 pCi/L	2.3× over
2	Harrisonville	7.2 pCi/L	1.8× over
3	Greenwood	7.1 pCi/L	1.8× over
4	Platte City	6.9 pCi/L	1.7× over
5	West Plains	6.9 pCi/L	1.7× over
6	Odessa	6.7 pCi/L	1.7× over
7	Festus	6.0 pCi/L	1.5× over
8	Lake Lotawana	5.9 pCi/L	1.5× over
9	Lakeshire	5.9 pCi/L	1.5× over
10	Fenton	5.6 pCi/L	1.4× over
11	Moscow Mills	5.3 pCi/L	1.3× over
12	Country Club Village	5.2 pCi/L	1.3× over
13	Marlborough	5.0 pCi/L	1.3× over
14	Imperial	5.0 pCi/L	1.2× over
15	Eureka	4.9 pCi/L	1.2× over
16	Rolla	4.9 pCi/L	1.2× over
17	Sappington	4.8 pCi/L	1.2× over
18	Troy	4.6 pCi/L	1.1× over
19	Independence	4.6 pCi/L	1.1× over
20	Pleasant Hill	4.5 pCi/L	1.1× over
21	Camdenton	4.5 pCi/L	1.1× over
22	Weston	4.5 pCi/L	1.1× over
23	Blue Springs	4.3 pCi/L	1.1× over
24	Gladstone	4.2 pCi/L	1.1× over
25	Wright City	4.2 pCi/L	1.0× over
26	Saint Paul	4.1 pCi/L	1.0× over
27	Saint Joseph	4.1 pCi/L	1.0× over
✓ Below EPA action level (4 pCi/L)
28	Belton	3.9 pCi/L	1.0× under
29	Raymore	3.9 pCi/L	1.0× under
30	Black Jack	3.9 pCi/L	1.0× under
31	Grain Valley	3.9 pCi/L	1.0× under
32	Raytown	3.8 pCi/L	1.0× under
33	Wentzville	3.8 pCi/L	1.0× under
34	North Kansas City	3.8 pCi/L	0.9× under
35	Pacific	3.8 pCi/L	0.9× under
36	Saint Peters	3.7 pCi/L	0.9× under
37	Weatherby Lake	3.6 pCi/L	0.9× under
38	Grandview	3.5 pCi/L	0.9× under
39	Byrnes Mill	3.5 pCi/L	0.9× under
40	East Independence	3.4 pCi/L	0.9× under
41	Peculiar	3.4 pCi/L	0.9× under
42	Lake Saint Louis	3.4 pCi/L	0.8× under
43	Manchester	3.4 pCi/L	0.8× under
44	Springfield	3.4 pCi/L	0.8× under
45	Columbia	3.4 pCi/L	0.8× under
46	Lees Summit	3.4 pCi/L	0.8× under
47	O'Fallon	3.4 pCi/L	0.8× under
48	Arnold	3.3 pCi/L	0.8× under
49	Kirksville	3.3 pCi/L	0.8× under
50	Perryville	3.3 pCi/L	0.8× under
51	Riverside	3.2 pCi/L	0.8× under
52	Hillsboro	3.2 pCi/L	0.8× under
53	Hazelwood	3.2 pCi/L	0.8× under
54	Kearney	3.1 pCi/L	0.8× under
55	Oakville	3.1 pCi/L	0.8× under
56	Parkville	3.0 pCi/L	0.8× under
57	Ballwin	3.0 pCi/L	0.8× under
58	Pleasant Valley	3.0 pCi/L	0.8× under
59	Warrenton	3.0 pCi/L	0.8× under
60	Chesterfield	2.9 pCi/L	0.7× under
61	Town and Country	2.9 pCi/L	0.7× under
62	Kimberling City	2.9 pCi/L	0.7× under
63	Union	2.9 pCi/L	0.7× under
64	Wardsville	2.9 pCi/L	0.7× under
65	Marthasville	2.9 pCi/L	0.7× under
66	Richmond Heights	2.9 pCi/L	0.7× under
67	Ozark	2.8 pCi/L	0.7× under
68	Oronogo	2.8 pCi/L	0.7× under
69	De Soto	2.8 pCi/L	0.7× under
70	Crystal City	2.8 pCi/L	0.7× under
71	Wildwood	2.7 pCi/L	0.7× under
72	Cottleville	2.7 pCi/L	0.7× under
73	Neosho	2.7 pCi/L	0.7× under
74	Winchester	2.7 pCi/L	0.7× under
75	Shell Knob	2.6 pCi/L	0.7× under
76	St. Louis	2.6 pCi/L	0.7× under
77	Willard	2.6 pCi/L	0.7× under
78	Barnhart	2.6 pCi/L	0.6× under
79	Concord	2.5 pCi/L	0.6× under
80	Murphy	2.5 pCi/L	0.6× under
81	Ellisville	2.5 pCi/L	0.6× under
82	Strafford	2.5 pCi/L	0.6× under
83	Maryland Heights	2.5 pCi/L	0.6× under
84	Liberty	2.4 pCi/L	0.6× under
85	Republic	2.4 pCi/L	0.6× under
86	Saint Charles	2.4 pCi/L	0.6× under
87	Sunset Hills	2.4 pCi/L	0.6× under
88	University City	2.4 pCi/L	0.6× under
89	Hanley Hills	2.3 pCi/L	0.6× under
90	Lake Winnebago	2.3 pCi/L	0.6× under
91	Crestwood	2.3 pCi/L	0.6× under
92	Des Peres	2.2 pCi/L	0.6× under
93	Kansas City	2.1 pCi/L	0.5× under
94	Ashland	2.1 pCi/L	0.5× under
95	Weldon Spring	2.1 pCi/L	0.5× under
96	Maplewood	2.1 pCi/L	0.5× under
97	Warrensburg	2.1 pCi/L	0.5× under
98	Clayton	2.1 pCi/L	0.5× under
99	Hollister	2.0 pCi/L	0.5× under
100	Ladue	2.0 pCi/L	0.5× under
101	Frontenac	2.0 pCi/L	0.5× under
102	Cape Girardeau	2.0 pCi/L	0.5× under
103	Creve Coeur	2.0 pCi/L	0.5× under
104	Fair Grove	2.0 pCi/L	0.5× under
105	Jefferson City	2.0 pCi/L	0.5× under
106	Mehlville	2.0 pCi/L	0.5× under
107	High Ridge	1.9 pCi/L	0.5× under
108	Affton	1.9 pCi/L	0.5× under
109	Clarkson Valley	1.9 pCi/L	0.5× under
110	Olivette	1.9 pCi/L	0.5× under
111	Valley Park	1.8 pCi/L	0.5× under
112	Nixa	1.8 pCi/L	0.5× under
113	Florissant	1.8 pCi/L	0.4× under
114	Clever	1.8 pCi/L	0.4× under
115	Kirkwood	1.8 pCi/L	0.4× under
116	Rogersville	1.8 pCi/L	0.4× under
117	Battlefield	1.7 pCi/L	0.4× under
118	Webster Groves	1.7 pCi/L	0.4× under
119	Waynesville	1.7 pCi/L	0.4× under
120	Dardenne Prairie	1.7 pCi/L	0.4× under
121	Cedar Hill	1.7 pCi/L	0.4× under
122	Carthage	1.6 pCi/L	0.4× under
123	Brentwood	1.6 pCi/L	0.4× under
124	Hillsdale	1.6 pCi/L	0.4× under
125	Lemay	1.6 pCi/L	0.4× under
126	Saint George	1.6 pCi/L	0.4× under
127	Smithville	1.5 pCi/L	0.4× under
128	Joplin	1.3 pCi/L	0.3× under
129	Jackson	1.2 pCi/L	0.3× under
130	Warson Woods	1.1 pCi/L	0.3× under
131	Merriam Woods	0.9 pCi/L	0.2× under
132	Poplar Bluff	0.9 pCi/L	0.2× under

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