Ohio Cities Ranked by Indoor Radon Levels

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

Calcutta has the highest measured indoor radon in Ohio at 16.4 pCi/L, based on Airthings measurements across 273 cities.

Updated August 16, 2026

Highest city

16.4pCi/L

Calcutta

Ohio city average

3.7pCi/L

across 273 cities

Above action level

95/ 273

cities

Ohio Cities Ranked by Indoor Radon Levels
#	Location	Avg level	Monitors	vs action level
1	Calcutta	16.4 pCi/L	7	4.1× over
2	Millersburg	13.4 pCi/L	7	3.3× over
3	Heath	11.6 pCi/L	15	2.9× over
4	Danville	10.3 pCi/L	6	2.6× over
5	Bellefontaine	9.8 pCi/L	9	2.4× over
6	Blacklick Estates	9.3 pCi/L	9	2.3× over
7	Mount Vernon	9.2 pCi/L	12	2.3× over
8	Northridge	9.2 pCi/L	11	2.3× over
9	Obetz	9.0 pCi/L	8	2.2× over
10	Salem Heights	8.7 pCi/L	8	2.2× over
11	Reynoldsburg	8.4 pCi/L	44	2.1× over
12	Mantua	8.4 pCi/L	12	2.1× over
13	Commercial Point	8.1 pCi/L	13	2.0× over
14	Centerburg	8.0 pCi/L	10	2.0× over
15	Harrison	8.0 pCi/L	17	2.0× over
16	Bellbrook	8.0 pCi/L	37	2.0× over
17	Beechwood Trails	7.6 pCi/L	8	1.9× over
18	Circleville	7.5 pCi/L	10	1.9× over
19	Newark	7.3 pCi/L	28	1.8× over
20	Lake Darby	7.2 pCi/L	18	1.8× over
21	Ashley	7.1 pCi/L	23	1.8× over
22	Silver Lake	6.7 pCi/L	7	1.7× over
23	Miamisburg	6.7 pCi/L	14	1.7× over
24	Port Clinton	6.7 pCi/L	9	1.7× over
25	Canal Winchester	6.5 pCi/L	17	1.6× over
26	Monroe	6.4 pCi/L	16	1.6× over
27	Wapakoneta	6.3 pCi/L	7	1.6× over
28	Xenia	6.3 pCi/L	16	1.6× over
29	Delaware	6.3 pCi/L	72	1.6× over
30	Trenton	6.2 pCi/L	12	1.6× over
31	New Franklin	6.2 pCi/L	8	1.5× over
32	Gahanna	6.1 pCi/L	44	1.5× over
33	Fairborn	6.1 pCi/L	26	1.5× over
34	Granville	6.0 pCi/L	44	1.5× over
35	New Philadelphia	5.9 pCi/L	12	1.5× over
36	Johnstown	5.8 pCi/L	11	1.5× over
37	Ashland	5.8 pCi/L	8	1.5× over
38	Northwood	5.8 pCi/L	7	1.5× over
39	Marion	5.8 pCi/L	16	1.4× over
40	Vermilion	5.7 pCi/L	7	1.4× over
41	Lincoln Village	5.7 pCi/L	24	1.4× over
42	Pickerington	5.6 pCi/L	50	1.4× over
43	Worthington	5.6 pCi/L	101	1.4× over
44	Westerville	5.5 pCi/L	97	1.4× over
45	Vandalia	5.5 pCi/L	7	1.4× over
46	Bluffton	5.3 pCi/L	9	1.3× over
47	Columbus	5.3 pCi/L	113	1.3× over
48	North Canton	5.3 pCi/L	34	1.3× over
49	Sandusky	5.2 pCi/L	15	1.3× over
50	Riverside	5.2 pCi/L	11	1.3× over
51	Minerva Park	5.1 pCi/L	24	1.3× over
52	Plain City	5.1 pCi/L	23	1.3× over
53	Massillon	5.1 pCi/L	17	1.3× over
54	Piqua	5.0 pCi/L	8	1.3× over
55	Perry Heights	5.0 pCi/L	7	1.2× over
56	Morrow	4.9 pCi/L	20	1.2× over
57	Leesburg	4.9 pCi/L	10	1.2× over
58	Urbana	4.9 pCi/L	9	1.2× over
59	Dublin	4.8 pCi/L	116	1.2× over
60	Powell	4.8 pCi/L	129	1.2× over
61	Whitehall	4.8 pCi/L	6	1.2× over
62	Macedonia	4.8 pCi/L	14	1.2× over
63	Huber Ridge	4.7 pCi/L	23	1.2× over
64	Springfield	4.7 pCi/L	29	1.2× over
65	Highpoint	4.5 pCi/L	22	1.1× over
66	Huron	4.5 pCi/L	9	1.1× over
67	North Royalton	4.5 pCi/L	20	1.1× over
68	Hunter	4.4 pCi/L	23	1.1× over
69	Troy	4.4 pCi/L	18	1.1× over
70	Upper Arlington	4.4 pCi/L	105	1.1× over
71	White Oak	4.4 pCi/L	6	1.1× over
72	Wooster	4.3 pCi/L	15	1.1× over
73	Streetsboro	4.3 pCi/L	16	1.1× over
74	Tipp City	4.3 pCi/L	10	1.1× over
75	Sunbury	4.3 pCi/L	47	1.1× over
76	Zanesville	4.3 pCi/L	6	1.1× over
77	Grove City	4.3 pCi/L	59	1.1× over
78	Beachwood	4.2 pCi/L	13	1.1× over
79	Mulberry	4.2 pCi/L	7	1.1× over
80	Hilliard	4.2 pCi/L	99	1.1× over
81	Montrose-Ghent	4.2 pCi/L	45	1.1× over
82	Finneytown	4.2 pCi/L	12	1.1× over
83	New Albany	4.2 pCi/L	68	1.0× over
84	Baltimore	4.2 pCi/L	9	1.0× over
85	Lithopolis	4.1 pCi/L	17	1.0× over
86	New Bremen	4.1 pCi/L	7	1.0× over
87	Greensburg	4.1 pCi/L	10	1.0× over
88	North Olmsted	4.1 pCi/L	20	1.0× over
89	Etna	4.1 pCi/L	8	1.0× over
90	Bexley	4.1 pCi/L	49	1.0× over
91	Waterville	4.1 pCi/L	20	1.0× over
92	Marysville	4.0 pCi/L	30	1.0× over
93	Springboro	4.0 pCi/L	24	1.0× over
94	Lebanon	4.0 pCi/L	27	1.0× over
95	Grandview Heights	4.0 pCi/L	40	1.0× over
✓ Below EPA action level (4 pCi/L)
96	Louisville	4.0 pCi/L	7	1.0× under
97	Mount Gilead	3.9 pCi/L	9	1.0× under
98	Hamilton	3.9 pCi/L	9	1.0× under
99	West Jefferson	3.9 pCi/L	6	1.0× under
100	Findlay	3.8 pCi/L	38	0.9× under
101	Perrysburg	3.8 pCi/L	30	0.9× under
102	Amelia	3.8 pCi/L	8	0.9× under
103	Wetherington	3.8 pCi/L	35	0.9× under
104	Beavercreek	3.7 pCi/L	63	0.9× under
105	South Lebanon	3.7 pCi/L	14	0.9× under
106	Doylestown	3.7 pCi/L	6	0.9× under
107	Lewis Center	3.7 pCi/L	124	0.9× under
108	Washington Court House	3.7 pCi/L	8	0.9× under
109	West Carrollton City	3.6 pCi/L	16	0.9× under
110	Lancaster	3.6 pCi/L	27	0.9× under
111	Whitehouse	3.6 pCi/L	9	0.9× under
112	Avon Lake	3.6 pCi/L	18	0.9× under
113	Galion	3.6 pCi/L	8	0.9× under
114	Sheffield	3.6 pCi/L	8	0.9× under
115	Greentown	3.5 pCi/L	12	0.9× under
116	Kettering	3.5 pCi/L	38	0.9× under
117	Sawyerwood	3.5 pCi/L	6	0.9× under
118	Canal Fulton	3.5 pCi/L	6	0.9× under
119	Hillsboro	3.5 pCi/L	10	0.9× under
120	Amberley	3.4 pCi/L	8	0.9× under
121	Day Heights	3.4 pCi/L	15	0.9× under
122	East Palestine	3.4 pCi/L	9	0.8× under
123	Pataskala	3.3 pCi/L	12	0.8× under
124	Dalton	3.3 pCi/L	7	0.8× under
125	New California	3.3 pCi/L	62	0.8× under
126	North Zanesville	3.3 pCi/L	8	0.8× under
127	Kent	3.3 pCi/L	20	0.8× under
128	Mentor-on-the-Lake	3.2 pCi/L	8	0.8× under
129	Uniontown	3.2 pCi/L	15	0.8× under
130	Avon Center	3.1 pCi/L	22	0.8× under
131	Green	3.1 pCi/L	10	0.8× under
132	Thornport	3.1 pCi/L	6	0.8× under
133	Grafton	3.1 pCi/L	7	0.8× under
134	Avon	3.1 pCi/L	20	0.8× under
135	Norwalk	3.1 pCi/L	8	0.8× under
136	Saint Bernard	3.1 pCi/L	11	0.8× under
137	Beckett Ridge	3.1 pCi/L	51	0.8× under
138	Kings Mills	3.1 pCi/L	27	0.8× under
139	Loveland	3.1 pCi/L	38	0.8× under
140	Sharonville	3.0 pCi/L	9	0.8× under
141	Martins Ferry	3.0 pCi/L	7	0.8× under
142	North Ridgeville	3.0 pCi/L	41	0.8× under
143	Oakwood	3.0 pCi/L	39	0.8× under
144	Withamsville	3.0 pCi/L	13	0.8× under
145	Cleveland	3.0 pCi/L	32	0.7× under
146	New Miami	3.0 pCi/L	12	0.7× under
147	The Village of Indian Hill	2.9 pCi/L	17	0.7× under
148	Geneva	2.9 pCi/L	11	0.7× under
149	Maumee	2.9 pCi/L	27	0.7× under
150	Portage Lakes	2.9 pCi/L	15	0.7× under
151	Bowling Green	2.9 pCi/L	22	0.7× under
152	Oregon	2.9 pCi/L	9	0.7× under
153	Mansfield	2.9 pCi/L	10	0.7× under
154	Middletown	2.9 pCi/L	9	0.7× under
155	Batavia	2.9 pCi/L	11	0.7× under
156	Ontario	2.9 pCi/L	13	0.7× under
157	Sylvania	2.8 pCi/L	25	0.7× under
158	Amherst	2.8 pCi/L	25	0.7× under
159	New Carlisle	2.8 pCi/L	7	0.7× under
160	Brunswick	2.8 pCi/L	52	0.7× under
161	Sixteen Mile Stand	2.8 pCi/L	15	0.7× under
162	Oxford	2.8 pCi/L	16	0.7× under
163	Highland Heights	2.8 pCi/L	12	0.7× under
164	Fairfield	2.7 pCi/L	11	0.7× under
165	Bethesda	2.7 pCi/L	7	0.7× under
166	Centerville	2.7 pCi/L	53	0.7× under
167	Dent	2.7 pCi/L	9	0.7× under
168	Dry Run	2.7 pCi/L	7	0.7× under
169	Bay Village	2.7 pCi/L	29	0.7× under
170	Medina	2.7 pCi/L	67	0.7× under
171	Mason	2.7 pCi/L	76	0.7× under
172	Peninsula	2.7 pCi/L	6	0.7× under
173	Akron	2.7 pCi/L	16	0.7× under
174	Loveland Park	2.6 pCi/L	9	0.7× under
175	Northfield	2.6 pCi/L	7	0.7× under
176	Berea	2.6 pCi/L	14	0.7× under
177	Canton	2.6 pCi/L	15	0.7× under
178	Mentor	2.6 pCi/L	38	0.7× under
179	Terrace Park	2.6 pCi/L	12	0.6× under
180	Mogadore	2.5 pCi/L	9	0.6× under
181	Cuyahoga Falls	2.5 pCi/L	25	0.6× under
182	Eaton Estates	2.5 pCi/L	7	0.6× under
183	Mariemont	2.5 pCi/L	8	0.6× under
184	Cherry Grove	2.5 pCi/L	22	0.6× under
185	Lorain	2.5 pCi/L	7	0.6× under
186	Gnadenhutten	2.5 pCi/L	10	0.6× under
187	Milford	2.4 pCi/L	6	0.6× under
188	Montgomery	2.4 pCi/L	13	0.6× under
189	Wadsworth	2.4 pCi/L	33	0.6× under
190	Dayton	2.4 pCi/L	44	0.6× under
191	Sidney	2.4 pCi/L	7	0.6× under
192	Huber Heights	2.4 pCi/L	27	0.6× under
193	Lexington	2.3 pCi/L	7	0.6× under
194	Shaker Heights	2.3 pCi/L	11	0.6× under
195	Middleburg Heights	2.3 pCi/L	9	0.6× under
196	Pepper Pike	2.3 pCi/L	9	0.6× under
197	Athens	2.3 pCi/L	21	0.6× under
198	Franklin	2.3 pCi/L	9	0.6× under
199	Richfield	2.3 pCi/L	16	0.6× under
200	Shawnee Hills	2.3 pCi/L	6	0.6× under
201	Madeira	2.3 pCi/L	25	0.6× under
202	Rocky River	2.3 pCi/L	29	0.6× under
203	Brimfield	2.3 pCi/L	8	0.6× under
204	Mayfield	2.2 pCi/L	7	0.6× under
205	Boardman	2.2 pCi/L	11	0.6× under
206	Painesville	2.2 pCi/L	30	0.6× under
207	Chardon	2.2 pCi/L	21	0.6× under
208	Strongsville	2.2 pCi/L	24	0.6× under
209	Cincinnati	2.1 pCi/L	6	0.5× under
210	Saint Clairsville	2.1 pCi/L	9	0.5× under
211	Silverton	2.1 pCi/L	7	0.5× under
212	Mount Repose	2.1 pCi/L	14	0.5× under
213	Reminderville	2.1 pCi/L	14	0.5× under
214	Independence	2.1 pCi/L	9	0.5× under
215	Bainbridge	2.1 pCi/L	24	0.5× under
216	Marietta	2.1 pCi/L	7	0.5× under
217	Seven Hills	2.1 pCi/L	15	0.5× under
218	Blue Ash	2.1 pCi/L	7	0.5× under
219	Boston Heights	2.0 pCi/L	10	0.5× under
220	Broadview Heights	2.0 pCi/L	28	0.5× under
221	Wyoming	2.0 pCi/L	12	0.5× under
222	Parma	2.0 pCi/L	15	0.5× under
223	Upper Sandusky	2.0 pCi/L	6	0.5× under
224	Brookville	2.0 pCi/L	10	0.5× under
225	Westlake	1.9 pCi/L	35	0.5× under
226	Delhi Hills	1.9 pCi/L	7	0.5× under
227	Parma Heights	1.9 pCi/L	8	0.5× under
228	Willoughby	1.9 pCi/L	10	0.5× under
229	Sheffield Lake	1.8 pCi/L	8	0.5× under
230	Olmsted Falls	1.8 pCi/L	36	0.5× under
231	Poland	1.8 pCi/L	7	0.5× under
232	Ottawa Hills	1.8 pCi/L	10	0.4× under
233	Ross	1.8 pCi/L	7	0.4× under
234	Richmond Heights	1.8 pCi/L	6	0.4× under
235	Stow	1.8 pCi/L	27	0.4× under
236	Hudson	1.7 pCi/L	54	0.4× under
237	Chagrin Falls	1.7 pCi/L	13	0.4× under
238	Landen	1.7 pCi/L	12	0.4× under
239	Elyria	1.6 pCi/L	13	0.4× under
240	Canfield	1.6 pCi/L	16	0.4× under
241	Sherwood	1.6 pCi/L	7	0.4× under
242	Twinsburg	1.6 pCi/L	18	0.4× under
243	Ravenna	1.6 pCi/L	15	0.4× under
244	Brecksville	1.6 pCi/L	17	0.4× under
245	East Cleveland	1.5 pCi/L	8	0.4× under
246	Holland	1.5 pCi/L	19	0.4× under
247	Walton Hills	1.5 pCi/L	7	0.4× under
248	Fairfax	1.5 pCi/L	10	0.4× under
249	Evendale	1.5 pCi/L	6	0.4× under
250	Fairlawn	1.5 pCi/L	28	0.4× under
251	Brooklyn	1.5 pCi/L	7	0.4× under
252	Five Points	1.5 pCi/L	118	0.4× under
253	Mack	1.4 pCi/L	11	0.4× under
254	Solon	1.4 pCi/L	21	0.3× under
255	Chesterland	1.4 pCi/L	15	0.3× under
256	Aurora	1.4 pCi/L	17	0.3× under
257	Orange	1.4 pCi/L	6	0.3× under
258	Fairport Harbor	1.3 pCi/L	6	0.3× under
259	Cleveland Heights	1.3 pCi/L	20	0.3× under
260	Norwood	1.2 pCi/L	25	0.3× under
261	Wright-Patterson AFB	1.2 pCi/L	9	0.3× under
262	Fairview Park	1.1 pCi/L	12	0.3× under
263	Englewood	1.1 pCi/L	7	0.3× under
264	Gates Mills	1.1 pCi/L	7	0.3× under
265	University Heights	1.1 pCi/L	7	0.3× under
266	Lakewood	1.1 pCi/L	32	0.3× under
267	Toledo	1.0 pCi/L	9	0.2× under
268	Cheviot	0.9 pCi/L	7	0.2× under
269	Kirtland	0.9 pCi/L	6	0.2× under
270	Edgewood	0.8 pCi/L	6	0.2× under
271	Yorkville	0.8 pCi/L	6	0.2× under
272	Moreland Hills	0.7 pCi/L	9	0.2× under
273	Willowick	0.6 pCi/L	7	0.2× under

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