The link has been made before, but what's new is the low levels.
Scientists believe the arsenic may come from tap water, but more study is needed.
Experts point out the public water system is now meeting tough new standards on arsenic levels.
The link has been made before, but what's new is the low levels.
Scientists believe the arsenic may come from tap water, but more study is needed.
Experts point out the public water system is now meeting tough new standards on arsenic levels.