UPDATE 26 March - Just when you thought there actually might be some improvement in water quality, here comes this information to ponder
Bathing and showering: Under-appreciated sources of water pollution from medicines
ScienceDaily (2010-03-25) -- That bracing morning shower and soothing bedtime soak in the tub are potentially important but until now unrecognized sources of the hormones, antibiotics, and other pharmaceuticals that pollute the environment, scientists have reported. ... ; read full article
Atrazine is a carcinogenic chemical used in the production of corn, so it bodes well to make sure that any corn containing product you choose is organic.
EPA has not addressed fluoride which is a cancer promoting substance, and it appears that there has been nothing to address the difficulties of water treatment systems to remove these chemicals as well as the residue and metabolites from prescription drugs.
I am not too sure this will come to pass although it is long overdue.