Recent rainwater research conducted in the United States indicates that almost one third of all potable water used is flushed down the toilet!  The research focused on four major cities: Philadelphia, New York, Seattle and Chicago. It suggests that urban rainwater harvesting could have a large impact on potable water conservation; potentially saving up to 80 percent of toilet flushes.water splash with reflection

Besides the water saving potential, the research also indicates that households could save up to 25 percent on their water usage charges.

Read about the research in this article published by Brooks Hays via United Press International.