The Power of Information

National Drinking Water Database


Radon in Minnesota


Radon is a radioactive breakdown product of radium and uranium in soil, rock and water; it is often present in groundwater. [read more]

The Most Polluted Communities in Minnesota

552 water utilities reported detecting Radon in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Radon level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Madelia
Madelia, MN
2,3204 of 42931.58 pCi/L
(602.67 to 9107 pCi/L)
2EL Presidente Apartments
Minneapolis, MN
254 of 41767 pCi/L
(998 to 3420 pCi/L)
3Calumet
Calumet, MN
3834 of 41607.5 pCi/L
(1385 to 1805 pCi/L)
4Saint Clair
St Clair, MN
8277 of 71477.46 pCi/L
(40 to 4950 pCi/L)
5Big Lake
Big Lake, MN
9,0004 of 41330 pCi/L
(1030 to 1710 pCi/L)
6Delavan
Delavan, MN
2064 of 41310.5 pCi/L
(200 to 3940 pCi/L)
7Iron Junction
Iron, MN
904 of 41250 pCi/L
(1190 to 1330 pCi/L)
8Sherburne Country Mobile Home Park
Big Lake, MN
2804 of 41212.25 pCi/L
(999 to 1460 pCi/L)
9Mille Lacs Island Resort
Breezy Point, MN
6002 of 21190 pCi/L
(1170 to 1210 pCi/L)
10Hilltop Water Company
Scandia, MN
404 of 41133 pCi/L
(962 to 1220 pCi/L)

Health Based Limits for Radon

StandardDescriptionLevel
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.1.5 pCi/L
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.150 pCi/L

Violation Summary for Radon in Minnesota

There are no violations reported for this contaminant in Minnesota