BPA-free drinking water containers are manufactured without the use of bisphenol A and therefore help persons drinking from such containers to reduce their exposure to this chemical, according to the Centers for Disease Control. However, the human health effects of BPA exposure are not well-understood.
BPA is used in the manufacture of polycarbonate plastics and as a protective liner and sealant, according to the CDC. Exposure to high levels of BPA has been correlated with reproductive anomalies in laboratory animals, but no effects in humans are known with certainty. Exposure to BPA is widespread in the population, with as many as 93 percent of adults having measurable levels of BPA in their urine.