"Safe" insecticides detected in suburban streams

The pyrethroid insecticides once touted as a safer alternative to the likes of DDT for domestic and garden use have been detected in suburban stream sediments by Donald Weston of the University of California, Berkeley, and colleagues. Pyrethroids are indeed less of a hazard to human health than many other insecticides but surprisingly little is known about their environmental fate and whether or not they might accumulate in ecosystems and cause problems for aquatic systems. Weston and colleagues say that their findings suggest long-overdue environmental monitoring for these materials should now be made a priority.