I was recently asked about arsenic streaks in my area.
Arsenic is a natural element that occurs in soil and rocks. Most people hear the word arsenic and immediately become concerned. I work with a lot of buyers purchasing small acreage properties here in Salem, Oregon so am familiar with well testing. In Oregon, the seller of a home with a well is required, by law, to test for coliform (e.coli) bacterias, as well as nitrates. I advise my clients to ask for lead and arsenic at the same time.
The USGS (United States Geological Survey) compiles data from well testing from all over the United States. Their sampling showed that there were some immediate concentrations of arsenic in the well water of the Willamette Basin. Please do not read this sentence as there is arsenic in all well water in the Willamette Basin. This is not the case. Arsenic in Well Water in the US
There were some areas of high concentration of arsenic in the bedrock areas of Lane and Linn Counties, as well as some in the Tualatin Basin. This is important for you to know as a buyer, so that you can do your due diligence and get your water tested.
For more great information about arsenic in well water, check out the following websites:
Centers for Disease Control Arsenic Fact Sheet
I am not a well expert or an expert on arsenic in well water. If you are concerned about your water quality. Talk with your local lab to find out about your water tested for arsenic.