Household detergents, shampoos may form harmful substance in waste water

Household detergents, shampoos may form harmful substance in waste water  
http://www.eurekalert.org/pub_releases/2010-04/acs-hds040710.php
 
"Scientists are reporting evidence that certain ingredients in shampoo, detergents and other household cleaning agents may be a source of precursor materials for formation of a suspected cancer-causing contaminant in water supplies that receive water from sewage treatment plants. The study sheds new light on possible environmental sources of this poorly understood water contaminant, called NDMA, which is of ongoing concern to health officials. Their study is in ACS' Environmental Science & Technology, a semi-monthly journal."