State radon data hub

Minnesota radon levels, county by county

87 Minnesota counties have published radon test data. Ranked worst-first below — the median county sees 55.9% of home tests reach the EPA action level of 4 pCi/L. Deep-dive pages (data + geology + housing stock) exist for 3 counties so far; more ship as coverage expands.

Costs, licensing, and how to read a quote: the Minnesota mitigation cost guide. Instant county lookup: radon by ZIP.

#	County	% tests ≥ 4 pCi/L	Tests (10-yr)	EPA zone
1	Rock	83.8%	138	1
2	Murray	76.4%	142	1
3	Renville	75.2%	205	1
4	Brown	73.7%	881	1
5	Yellow Medicine	71.6%	144	1
6	Pipestone	71.4%	238	1
7	Polk	70.8%	311	1
8	Nobles	70.4%	171	1
9	Redwood	70.1%	276	1
10	Jackson	69.8%	230	1
11	Freeborn	69.1%	544	1
12	Cottonwood	68.1%	264	1
13	Big Stone	67%	112	1
14	Sibley	66.6%	297	1
15	Le Sueur	65.7%	588	1
16	Kandiyohi	65.6%	554	1
17	Faribault	65.3%	223	1
18	Martin	64.9%	276	1
19	Blue Earth	64.8%	1,171	1
20	Chippewa	64.7%	181	1
21	Waseca	64.5%	367	1
22	Lyon	64.3%	415	1
23	Lincoln	64.2%	85	1
24	Fillmore	64.1%	753	1
25	Steele	63.8%	800	1
26	Grant	63.7%	93	1
27	Lac qui Parle	63.5%	130	1
28	Dodge	63.3%	365	1
29	Stevens	63%	210	1
30	Nicollet	62.7%	826	1
31	Watonwan	62.7%	188	1
32	Wabasha	62.6%	424	1
33	Mahnomen	62.5%	27	1
34	Douglas	62.1%	820	1
35	McLeod	61.7%	710	1
36	Clay	61.5%	334	1
37	Houston	59.6%	649	1
38	Rice	59.2%	1,470	1
39	Norman	58.4%	114	1
40	Otter Tail	57%	431	1
41	Traverse	56.5%	46	1
42	Goodhue	56.1%	718	1
43	Meeker	55.9%	472	1
44	Olmsted	55.9%	1,841	1
45	Marshall	55.6%	73	1
46	Swift	53%	178	1
47	Pennington	52.3%	93	1
48	Wright	52.2%	2,581	1
49	Becker	51.4%	228	1
50	Clearwater	50.5%	65	2
51	Stearns	50.2%	1,668	1
52	Winona	50%	1,440	1
53	Pope	49.2%	511	1
54	Todd	48.4%	171	1
55	Mower	48.2%	395	1
56	Scott	46.9%	2,869	1
57	Kanabec	46.5%	251	1
58	Hubbard	46.1%	193	1
59	Carlton	44.8%	495	2
60	Beltrami	41.9%	383	2
61	Wilkin	41.8%	64	1
62	Carver	41.4%	2,671	1
63	Cook	40.4%	102	2
64	Hennepin	40.3%	24,906	1
65	Dakota	38.7%	7,122	1
66	Sherburne	37.7%	1,516	1
67	Wadena	37.2%	101	1
68	Morrison	36.3%	629	2
69	Itasca	34.5%	702	2
70	Cass	33.5%	363	2
71	Red Lake	33.3%	22	1
72	Chisago	31.9%	665	2
73	Washington	31.5%	4,469	1
74	Benton	30.7%	348	2
75	Aitkin	30.5%	166	2
76	Ramsey	30.5%	6,744	1
77	Kittson	30.4%	15	1
78	Roseau	29.2%	36	1
79	Crow Wing	27.9%	816	2
80	Mille Lacs	27.7%	220	2
81	Koochiching	24.3%	108	2
82	Pine	24.2%	187	2
83	St. Louis	23.7%	3,010	2
84	Lake	21.8%	147	2
85	Isanti	18.6%	343	2
86	Anoka	17.4%	4,520	2
87	Lake of the Woods	14.3%	6	2

Source: CDC EPHT (labs), 2008–2017; county rank by share of tests at or above 4 pCi/L (counties with too few reported tests are excluded — absence of data is not absence of radon). Zones: EPA Map of Radon Zones. Full sourcing on the methodology page.