While news stories highlighting nitrate and other anthropogenic drinking-water contaminants are important ("Study: 1 in 8 drink nitrate-tainted water," Jan. 14), it is disheartening to know that geologic-sourced contaminants — toxic contaminants that most people have never heard of — affect more household drinking-water wells. But these contaminants get no press. Why? Because there is no "bad guy"?
Example: arsenic, an element found in many geologic materials. Here in Minnesota, ordinary geochemical conditions can release arsenic from solid aquifer material into the groundwater tapped by drinking-water wells. Arsenic exposure can cause cancer and many other health problems.
Arsenic contamination in domestic drinking water wells is common in Minnesota, across the Midwest and across the country. Detectable arsenic is present in almost half of sampled domestic wells, which translates to affecting an estimated half a million Minnesotans. Arsenic exceeding the Environmental Protection Agency's drinking water standard occurs in more than 11% of sampled wells, serving about 150,000 of our citizens. The Minnesota Department of Health recommends that homeowners consider treating well water that has detectable arsenic.
There is a misconception that nothing can be done to avoid arsenic in well water. We have made progress in our understanding of why it's there. With continuing effort and understanding, we will make the ultimate connection: how to avoid it.
For now, can we give arsenic (and manganese and radionuclides) a little ink? Homeowners: Test your domestic wells. Tell your friends, relatives and neighbors to test, too. Armed with knowledge, make a choice about treatment. Knowledge is powerful — and healthy.
Melinda Erickson, Roseville
The writer is a scientist who teaches at the University of Minnesota.
GROUP HOMES
Not all disability care is permanent
I appreciate the Star Tribune's work to bring attention to problems faced by people with disabilities. As the parent of an adult with disabilities, I read with interest — and some frustration — the Dec. 29 story "Minnesota's arbitrary aid to the disabled."
I have a question. For parents who care at home for an adult son or daughter with disabilities: What happens to the person when the parents die? Who cares for them then?