Hazards of Hydration
Sierra Magazine - Sierra Club
Choose your plastic water bottles carefully -- Clear, lightweight, and sturdy polycarbonate plastic bottles are standard equipment for millions of hikers and babies. (They are usually labeled #7 on the bottom; Nalgene is the best-known producer.) Since polycarbonate bottles don’t impart a taste to fluids, many users assume they are safer than bottles made out of other kinds of plastic. But now an accidental discovery has cast doubt on their safety.
"We just stumbled into this," says Hunt, "but we have been stunned by what we have seen."
Most at risk, says Colborn, are people with developing endocrine systems: pregnant women and newborns, followed by young children, and women who might get pregnant.