Send a comment on this item to LII: Send a comment on this item to LII staff, who on weekdays will usually reply within 24 hours. Consumer Factsheet On: Thallium Questions and answers related to the presence of thallium, "a metal found in natural deposits as ores containing other elements," in the drinking water supply. Discusses safe levels of thallium according to the Safe Drinking Water Act, health and environmental effects of thallium, and related topics. From the U.S. Environmental Protection Agency (EPA). http://www.epa.gov/safewater/contaminants/dw_contamfs/thallium.html Asterisk * indicates required field. Your Name Your Email Address * We will not sell or provide your email address to anyone else. Comment * Enter the verification code as it is shown in the box below. This helps prevent automated submissions. *