Arsenic is a naturally occurring element found in soils and groundwater. Arsenic concentrations vary in accordance with geographic location. When arsenic levels are found to be too high at a specific location, it may be necessary to treat drinking water to remove it.
Overview of Arsenic in Drinking Water
Where Arsenic Occurs in Oregon
For More Arsenic Information
Arsenic FAQ; Agency for Toxic Substances & Disease Registry (full PDF version)
Arsenic in Well Water (pdf) - Institute of Water and Watersheds and Environmental Health Science Center
Arsenic In Your Drinking Water (pdf) - Oregon State University Extension Service - Be Well Project
Wondering if your water is safe for livestock?
Several states have publications that may be of help.
What about arsenic in irrigation water?
Plants vary in their susceptibility to arsenic. Recommended limits for reclaimed irrigation water are 0.5 mg/l for long-term use and 2.0 mg/l for short-term use.
Is arsenic from treated lumber a concern?