Most research on the occurrence and effects of endocrine disrupting chemicals (EDCs) in the aquatic environment has focused on effluents from wastewater treatment plants (WWTPs) and effluent-impacted streams (Folmar and others, 1996; Jobling and others, 1998; Tyler and others, 1998; Barber and others, 2007; Vajda and others, 2008; Lee and others, 2010).