The Washington Post reported that more than 80 percent of the male smallmouth bass in the Potomac River are growing eggs, and after six years of searching, scientists still have not found the pollutants that are causing the abnormality. The Washington Suburban Sanitary Commission, which provides water to over 5 million people in the Washington metropolitan area says that the drinking water is clean, but the WSSC report for 2008 shows detectable levels of Dalapon (less than 1 microgram per liter), and Di(2-ethylhexyl)phthalate (less than 2 micrograms per liter).
Dalapon is a herbicide used to control grasses in a wide variety of crops. Di(2-ethylhexyl)phthalate (DEHP) is a commonly used plasticizer in the manufacture of articles made of polyvinyl chloride (PVC). DEHP is also used as a hydraulic fluid and as a dielectric fluid in capacitors.
Many organic chemicals mimic the effects of sex-hormones. DEHP metabolites in the blood of pregnant women have been significantly associated with decreased penis size, shorter anogenital distance, and the incomplete descent of testes in newborn boys.
 Pelley, Janet (November 2008). “Plasticizer may make boys less masculine“. Environ Sci Technol.