Hormones in water bodies
This 2004 article gives a certain amount of evidence that retention of waste products in lagoons for a few days instead of a few hours greatly reduces the concentration of mammaliam hormones in the effluent. It also claims that land microbes are better adapted to process and degrade mammal hormones than water microbes. (Like, DUH!) Therefore, use of effluent on land instead of dumping it into the water is less harmful to the whole biosphere. So why do not all municipal facilities for waste processing take this into account?