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EWG's Tap Water Database — 2019 UPDATE

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Thorium

Status: No national drinking water standard exists

 

2015-2017:

FOUND

1

states detected

5

utilities detected

1.9 million

people served

States reporting thorium in drinking water

UTILITIES WITH CONTAMINATION
State UtilitiesPeople Served
Virginia21,289,422
District Of Columbia3648,882
MORE
LESS

Utilities with the highest amounts of thorium, 2015-2017

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
Washington Aqueduct Division*Washington, DC1 of 710.00845 ppb0
D.C. Water and Sewer Authority*Washington, DC1 of 710.00845 ppb632,323
Arlington County*Arlington, VA1 of 710.00845 ppb215,000

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report Thorium, but it likely has the contaminant in its water supply.

UtilityLocationTestsAverage levelPeople served
D.C. Water and Sewer Authority*Washington, DC1 of 710.00845 ppb632,323
Arlington County*Arlington, VA1 of 710.00845 ppb215,000

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report Thorium, but it likely has the contaminant in its water supply.