I recently received a question from one of my readers about
safety of drinking water from clear plastic water bottles. These bottles, made from Lexan polycarbonate resin (a plastic polymer), are widely used for single-serving sales to one-gallon of water in stores and home-delivery bottles. Theee bottles appear to be safe because they do not impart any taste or odor to
water. Lexan polycarbonate is also used to make compact discs and DVDs, bulletproof windows, mobile phones, and computers.
The water delivery company sent my reader a notice saying that their Lexan polycarbonate bottles are perfectly safe to use. They suggested their customers visit a website that was designed to portray this plastic in a positive light.
But, actually, a toxic chemical is lurking in these bottles that does end up in
water you drink. Lexan used to be used to make baby bottles, but these are no longer sold. Hmmmmm...
STAY AWAY FROM BPA
In 1998, Dr. Patricia Hunt of Case Western University in Ohio discovered that one of
components of Lexan polycarbonate resin--bisphenol-A (BPA)--can leach into water from water bottles. BPA is a potent hormone disruptor. It can impair
reproductive organs and have adverse effects on breast tissue and prostate development.
Who do we believe? The water delivery company or Dr. Hunt?
I'm inclined to go with Dr. Hunt. I went to a website maintained by
authors of Our Stolen Future: How We Are Threatening Our Fertility, Intelligence and Survival, who are continuously searching
scientific literature for information on endochrine disruptors. The Our Stolen Future (http://www.ourstolenfuture.org/NewScience/oncompounds/bisp page on bisphenol-a henola/bpauses.htm#recentimportant) gives a whole page of links to scientific studies that show that BPA damages
endocrine system in a variety of ways.
BPA can leach from water bottles when exposed to heat and cleaning agents, but detectable levels of BPA can also leach into water from bottles just sitting at room temperature, according to a 2003 study conducted by
University of Missouri published in
journal Environmental Health Perspectives.
BETTER SAFE THAN SORRY
Is there is a level of BPA that may be acceptable? To answer that question we have to ask: acceptable to who? A healthy male? A woman? A child? The elderly? And how would you know how much leaching has occurred in
water? It could easily vary from day to day depending on how long
water had been in
bottle, whether or not
sun was shining on
bottle in
delivery truck, and a variety of other factors.