So, I know that permethrin is virtually harmless for human skin contact after it dries, but if it wears away after washing, it obviously breaks down and some is lost in the water. I am fairly new to backpacking, and haven't ever used permethrin before. Nervous about areas such as TN and PA, though. Does anyone know if it is harmful to the wildlife (those that live in or just drink the water) to cross water or dip a bandana/buff in the water with permethrin treated clothing? I know that commercial products have a low concentration, but if it kills ticks, it obviously has to have some potency. Thank you so much for your time!