3.2.6. Pyrethroids
These compounds are commonly used as insecticides, are
hydrophobic, and can be persistent in the environment. Pyrethroids
have a low toxicity relative to other pesticides (specifically the
organochlorines) so have recently been used in place of more toxic
pesticides. Biphenthrin, cypermethrin, and esfenvalerate are
among the most widely used pyrethroids, with esfenvalerate being
detected in surface water runoff (Brady et al., 2006).