There is actually quite a bit of evidence that endocrine disrupters and estrogen mimicing compounds are prevalent in our drinking water.
The household cleaning chemical industry has been removing alkylphenolethoxolates (APE's) and non-phenolethoxoltaes (NPE's) from approved listing of surfactants (surface-active ingredients) for several years; as these compounds are thought to have a contributing effect in numerous bio and aquatic disorders.
http://www.werf.org/downloads/pdfs/99ECO3.pdfThere is also a large body of evidence that 'environmental' estrogen is more common in cattle-producing states where dairy production relies heaviliy upon drugs to promote lactation. The urine from the animals is thought to be finding its way to ground water sources.
peace,
Griff