Arsenic is odorless, colorless and tasteless. To know whether there is arsenic in your drinking water, nothing can substitute for a proper lab test. But for the purpose of general information, we are providing a list of links to sites that show the distribution of arsenic in drinking water across the U.S.*
(Click here to download the printable pdf version of this list)
National:
USGS mapping of data from 31,500 wells.
NRDC provides EPA Data (Public Water Systems) from 25 states in Excel format
Regional
USGS report on New Hampshire and Vermont
Arizona
Low resolution map from the Arizona Geological Society in an article published in "Arizona Geology"
California
County by County totals of public water systems above the MCL
Idaho
Illinois
Maine
See New England Regional
Maryland
Massachusetts
See New England Regional
Michigan
Minnesota
Site with general info for Well Owners
Nebraska
New Hampshire
See New England Regional
New Jersey
The New Jersey Geological Society has a map of arsenic occurrence in New Jersey.
Ohio
Oregon
USGS Data for the Willamette Basin
Texas
Maps (public and private wells) in the second half of the presentation
Utah
Washington
Map and Excel list of public wells
Wisconsin
Public and Private well sampling maps and Excel Spreadsheets