"… nmental Protection Agency or health-based guidelines developed by the USGS and the EPA.Arsenic, radon and chromium are carcinogen …"

"… ming it is a deep well and not in danger of contamination,” she said.The USGS maps show that arsenic is mostly a problem in parts of New England east of …"

"… find it almost anywhere at high levels,” said Ayotte, lead author of the USGS study, also authored by Jo Ann Gronberg and Lori Apodaca.Other arsenic hot …"

"… ed “the really nasty ones.” But others, including manganese, have only USGS guidelines based on a small number of health studies.Most elements found i …"