Arsenic exposure sources

You should contact your local health department or EPA if you are
worried about sources in your area, and they will also be able to
direct you to valid The CDC is a great reference for
any tox and agood first stop for internet searching (eg
as opposed to Wackypedia sites).

NIOSH has info about occupational or industrial exposure.

Here are a couple of links to Arsenic exposure from water and other