Arsenic
For an overview of Arsenic in Drinking Water, visit these sites:
Arsenic Fact Sheet, Oregon Department of Human Services, (pdf only, with additional links.)
For information about where arsenic occurs in Oregon, see:
Arsenic in Ground Water of the Willamette Basin, Oregon, U.S. Geological Survey, 1999
Arsenic in ground water of the United States, USGS web site.
For more arsenic information:
Agency for Toxic Substances and Disease Registry, FAQ: Arsenic

Wondering if your water is safe for livestock? Several states have publications that may be of help.
Livestock Water Quality (University of Missouri)
Livestock and Water (Ohio State University)
When is Water Good Enough for Livestock? (Montana)
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?
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