A survey of websites and labels of more than 170 bottled waters sold in the U.S. found only three – and only one of the top 10 domestic brands – that give customers information about the water’s source, the method of purification and any chemical pollutants that remained after the water was treated, according to a new report by the Environmental Working Group (EWG).

Nestlé’s Pure Life Purified Water discloses its water source and treatment method on the label and offers an 800-number that consumers can call to request a water quality test report. But the nine other top domestic brands – Coca-Cola’s Dasani, Pepsi’s Aquafina, Crystal Geyser, and – strangely – six other of Nestlé’s seven brands – don’t answer at least one of the three key questions:

• Where does the water come from?
• Is it purified? How?
• Have tests found any contaminants?