Because of this risk, you may consider using a water filter which removes chlorine from drinking water. The British Berkefeld filter claims to remove chlorine as well as other toxins from drinking water. You can find one of their popular filters at this site:
http://www.readymaderesources.com/cart/index.php?act=viewProd&productId=516 Not only is consuming chlorine a risk, but chlorine gas which is released from hot, running water can also be a risk to your health.
Another source of exposure to chlorine gas is in cleaning products. The Melaleuca company offers a line of eco-friendly and non-toxic cleaning products, called "Eco Sense" which use natural products to disinfect and clean, and are free of chlorine, ammonia and phosphates. To learn more about their products, go to their link at: