Watch NOVA Season 7 Episode 7 Online

Water, water everywhere...but just how useful is it? NOVA travels to the Adirondack Mountains where acid rain is killing many high elevation lakes; to the Mississippi River where chlorine has combined with natural and manmade organic chemicals to form cancer-causing toxic chemical susbtances; to California, where conservation recycling has had to become a way of life; and to Bedford, Massachusetts, where the town wells have been contaminated by industrial waste.