The Power of Information

National Drinking Water Database


Radon in Arizona


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 Arizona

6 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)
1Metropolitan Dwid
Tucson, AZ
43,43310 of 14370.68 pCi/L
(0 to 932 pCi/L)
2City of Tempe
Tempe, AZ
160,0002 of 2366.42 pCi/L
(339.33 to 393.5 pCi/L)
3Town of Gilbert
Gilbert, AZ
100,0002 of 3265.67 pCi/L
(0 to 419 pCi/L)
4Metropolitan Dwid-Hub
Tucson, AZ
4,2501 of 2208.8 pCi/L
(0 to 417.6 pCi/L)
5City of Glendale
Glendale, AZ
180,0005 of 6104.33 pCi/L
(0 to 357 pCi/L)
6City of Meza Utilities Department
Mesa, AZ
350,0008 of 1881.39 pCi/L
(0 to 268.8 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 Arizona

There are no violations reported for this contaminant in Arizona