Sigg bottles are leaving Katy Farber with a bitter taste.

Like countless other eco-conscious consumers, the Middlesex, Vt., teacher and blogger switched to the aluminum bottles for her two young girls because of bisphenol-A, or BPA, a substance commonly used to harden plastic that has raised health concerns and bedeviled buyers of plastic bottles.

Now this shocker from Sigg Switzerland: Bottles made by the company before August 2008 had "trace amounts" of BPA in the epoxy liners. Sigg officials knew it since June 2006, but didn't announce it until last month.

Read more >>