Indiana Cities Ranked by Indoor Radon Levels

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

Peru has the highest measured indoor radon in Indiana at 10.9 pCi/L, based on Airthings measurements across 136 cities.

Updated September 28, 2026

Highest city

10.9pCi/L

Peru

Indiana city average

3.5pCi/L

across 136 cities

Above action level

36/ 136

cities

Indiana Cities Ranked by Indoor Radon Levels
#	Location	Avg level	vs action level
1	Peru	10.9 pCi/L	2.7× over
2	Rushville	10.9 pCi/L	2.7× over
3	Battle Ground	10.2 pCi/L	2.5× over
4	Yorktown	9.9 pCi/L	2.5× over
5	Boonville	8.9 pCi/L	2.2× over
6	LaPorte	7.9 pCi/L	2.0× over
7	Greenfield	7.3 pCi/L	1.8× over
8	Syracuse	6.9 pCi/L	1.7× over
9	Oolitic	6.5 pCi/L	1.6× over
10	North Webster	6.3 pCi/L	1.6× over
11	Corydon	6.2 pCi/L	1.5× over
12	Charlestown	6.0 pCi/L	1.5× over
13	Seelyville	5.9 pCi/L	1.5× over
14	Southport	5.8 pCi/L	1.5× over
15	Fairfield Heights	5.7 pCi/L	1.4× over
16	Muncie	5.5 pCi/L	1.4× over
17	Dayton	5.1 pCi/L	1.3× over
18	Middletown	5.1 pCi/L	1.3× over
19	Rome City	5.1 pCi/L	1.3× over
20	Vincennes	4.7 pCi/L	1.2× over
21	Kouts	4.6 pCi/L	1.2× over
22	Wanatah	4.6 pCi/L	1.2× over
23	Wabash	4.6 pCi/L	1.1× over
24	Plainfield	4.5 pCi/L	1.1× over
25	Dunlap	4.5 pCi/L	1.1× over
26	Henryville	4.5 pCi/L	1.1× over
27	Lafayette	4.4 pCi/L	1.1× over
28	Shorewood Forest	4.4 pCi/L	1.1× over
29	Jasper	4.3 pCi/L	1.1× over
30	Warren Park	4.3 pCi/L	1.1× over
31	Pittsboro	4.2 pCi/L	1.1× over
32	Whiteland	4.2 pCi/L	1.0× over
33	Crawfordsville	4.1 pCi/L	1.0× over
34	Ossian	4.1 pCi/L	1.0× over
35	Bargersville	4.1 pCi/L	1.0× over
36	Huntington	4.0 pCi/L	1.0× over
✓ Below EPA action level (4 pCi/L)
37	Terre Haute	4.0 pCi/L	1.0× under
38	Auburn	4.0 pCi/L	1.0× under
39	Marion	3.9 pCi/L	1.0× under
40	Pendleton	3.9 pCi/L	1.0× under
41	Aberdeen	3.9 pCi/L	1.0× under
42	Churubusco	3.9 pCi/L	1.0× under
43	Valparaiso	3.9 pCi/L	1.0× under
44	Greensburg	3.9 pCi/L	1.0× under
45	Roanoke	3.8 pCi/L	1.0× under
46	Waterloo	3.8 pCi/L	1.0× under
47	Warsaw	3.8 pCi/L	0.9× under
48	Indianapolis	3.8 pCi/L	0.9× under
49	Noblesville	3.7 pCi/L	0.9× under
50	Goshen	3.7 pCi/L	0.9× under
51	Centerville	3.7 pCi/L	0.9× under
52	Kokomo	3.7 pCi/L	0.9× under
53	Speedway	3.6 pCi/L	0.9× under
54	Decatur	3.6 pCi/L	0.9× under
55	Franklin	3.5 pCi/L	0.9× under
56	Broad Ripple	3.5 pCi/L	0.9× under
57	Lebanon	3.5 pCi/L	0.9× under
58	Fort Wayne	3.4 pCi/L	0.9× under
59	North Liberty	3.4 pCi/L	0.9× under
60	Anderson	3.4 pCi/L	0.8× under
61	Mooresville	3.3 pCi/L	0.8× under
62	Saint John	3.3 pCi/L	0.8× under
63	Cumberland	3.3 pCi/L	0.8× under
64	Fishers	3.3 pCi/L	0.8× under
65	Frankfort	3.2 pCi/L	0.8× under
66	Carmel	3.2 pCi/L	0.8× under
67	Fortville	3.2 pCi/L	0.8× under
68	West Lafayette	3.2 pCi/L	0.8× under
69	Beech Grove	3.2 pCi/L	0.8× under
70	Bloomington	3.1 pCi/L	0.8× under
71	New Haven	3.1 pCi/L	0.8× under
72	Dyer	3.1 pCi/L	0.8× under
73	Indian Heights	3.1 pCi/L	0.8× under
74	Evansville	3.1 pCi/L	0.8× under
75	Leo-Cedarville	3.0 pCi/L	0.8× under
76	Columbus	3.0 pCi/L	0.7× under
77	Clarksville	3.0 pCi/L	0.7× under
78	Brazil	3.0 pCi/L	0.7× under
79	Meridian Hills	2.9 pCi/L	0.7× under
80	McCordsville	2.9 pCi/L	0.7× under
81	Lakes of the Four Seasons	2.9 pCi/L	0.7× under
82	Greenwood	2.9 pCi/L	0.7× under
83	Galena	2.8 pCi/L	0.7× under
84	Elkhart	2.8 pCi/L	0.7× under
85	Martinsville	2.8 pCi/L	0.7× under
86	Richmond	2.8 pCi/L	0.7× under
87	Winona Lake	2.8 pCi/L	0.7× under
88	Zionsville	2.7 pCi/L	0.7× under
89	Lawrence	2.7 pCi/L	0.7× under
90	Gulivoire Park	2.6 pCi/L	0.7× under
91	Newburgh	2.6 pCi/L	0.7× under
92	Brownsburg	2.6 pCi/L	0.7× under
93	Sellersburg	2.6 pCi/L	0.6× under
94	Granger	2.5 pCi/L	0.6× under
95	Bluffton	2.5 pCi/L	0.6× under
96	New Palestine	2.5 pCi/L	0.6× under
97	Clermont	2.5 pCi/L	0.6× under
98	Portage	2.4 pCi/L	0.6× under
99	Huntertown	2.4 pCi/L	0.6× under
100	Cedar Lake	2.4 pCi/L	0.6× under
101	Milford	2.4 pCi/L	0.6× under
102	Westfield	2.4 pCi/L	0.6× under
103	Schererville	2.3 pCi/L	0.6× under
104	Ellettsville	2.3 pCi/L	0.6× under
105	Oak Park	2.3 pCi/L	0.6× under
106	Melody Hill	2.2 pCi/L	0.6× under
107	Whitestown	2.2 pCi/L	0.6× under
108	Jeffersonville	2.2 pCi/L	0.6× under
109	Chandler	2.2 pCi/L	0.6× under
110	Aurora	2.2 pCi/L	0.5× under
111	Avon	2.1 pCi/L	0.5× under
112	Crown Point	2.1 pCi/L	0.5× under
113	Georgetown	2.1 pCi/L	0.5× under
114	Greendale	2.1 pCi/L	0.5× under
115	Mishawaka	2.1 pCi/L	0.5× under
116	Osceola	2.0 pCi/L	0.5× under
117	Westville	2.0 pCi/L	0.5× under
118	Kendallville	2.0 pCi/L	0.5× under
119	Bright	2.0 pCi/L	0.5× under
120	Highland	1.9 pCi/L	0.5× under
121	Bloomfield	1.9 pCi/L	0.5× under
122	Cicero	1.8 pCi/L	0.5× under
123	Lowell	1.8 pCi/L	0.4× under
124	Griffith	1.6 pCi/L	0.4× under
125	South Bend	1.6 pCi/L	0.4× under
126	Munster	1.6 pCi/L	0.4× under
127	New Albany	1.5 pCi/L	0.4× under
128	Bristol	1.5 pCi/L	0.4× under
129	Columbia City	1.4 pCi/L	0.3× under
130	Chesterton	1.4 pCi/L	0.3× under
131	South Haven	1.3 pCi/L	0.3× under
132	Greencastle	1.2 pCi/L	0.3× under
133	Batesville	1.2 pCi/L	0.3× under
134	Hammond	1.1 pCi/L	0.3× under
135	Roselawn	0.6 pCi/L	0.2× under
136	Michigan City	0.4 pCi/L	0.1× under

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