Your hands may be doing all the dirty work. According to recent research, a common germ- fighting soap ingredient called triclosan is keeping your hands clean, but damaging the environment. Although triclosan is not harmful in soap, once it goes down the drain, it combines with chlorinated water to form a toxic compound that is detrimental to aquatic life. Studies conducted in Minnesota lakes shows that the most disruption occurred in the reproductive cycle, limiting sperm production in male fish and altering egg producing habits.
http://www.sciencenews.org/view/generic/id/59333/title/Science_%2B_the_Public__A_new_source_of_dioxins_Clean_hands