I think its cuz of plastics and birth control hormones in the water!
Most plastic products, from sippy cups to food wraps, can release chemicals that act like the sex hormone estrogen, according to a
study in
Environmental Health Perspectives.
The study found these chemicals even in products that didn't contain BPA, a compound in certain plastics that's been widely criticized because it mimics estrogen.
It is true that trace amounts of birth control and other medications—as well as household and industrial chemicals of every stripe—are present in many urban and suburban water supplies around the country, but there is considerable debate about whether their levels are high enough to warrant concern.