The Power of Information

National Drinking Water Database


Radon in Washington


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 Washington

17 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)
1Regency Place
Vancouver, WA
501 of 1710 pCi/L
(710 pCi/L)
2City of Kennewick
Kennewick, WA
64,6801 of 1650.17 pCi/L
(650.17 pCi/L)
3City of Spokane
Spokane, WA
211,5002 of 2527.79 pCi/L
(478.57 to 577 pCi/L)
4Morning Meadows
Vancouver, WA
751 of 1445 pCi/L
(445 pCi/L)
5Cascade Estates Satellite
Vancouver, WA
401 of 1420 pCi/L
(420 pCi/L)
6Camas Municipal Water Sewer System
Camas, WA
15,8801 of 1385 pCi/L
(385 pCi/L)
7Clark Public Utilities
Vancouver, WA
79,94814 of 14354.36 pCi/L
(215 to 475 pCi/L)
8City of Battle Ground Water Dept
Battle Ground, WA
15,0003 of 3350 pCi/L
(290 to 425 pCi/L)
9Lakehaven Utility District
Federal Way, WA
112,0001 of 1290 pCi/L
(290 pCi/L)
10Anderson Pud
Tumwater, WA
951 of 1290 pCi/L
(290 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 Washington

There are no violations reported for this contaminant in Washington