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National Drinking Water Database


Iodine-131 in Washington


Iodine-131 is a radioactive tracer used in medical applications, and present in the environment due to radioactive fallout from nuclear power station accidents and nuclear weapons testing.

The Most Polluted Communities in Washington

2 water utilities reported detecting Iodine-131 in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Iodine-131 level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Clark Public Utilities
Vancouver, WA
79,9481 of 1545000 ppb
(545000 ppb)
2City of Kennewick
Kennewick, WA
64,6801 of 3334.44 ppb
(0 to 1003.33 ppb)

Health Based Limits for Iodine-131

There are no health based standards that EWG is using for this chemical

Violation Summary for Iodine-131 in Washington

There are no violations reported for this contaminant in Washington