Guys, I just came across this site, explaining severe water issues that both California and well, on a more extreme level, Australia are dealing with.
Courtesy of California Green Solutions (http://www.californiagreensolutions.com):
Rainwater harvesting is a feasible, and highly efficient solution for residential, commercial and industrial buildings. Save stress on water infrastructures and save money!
Take a look at the posted images to read what the article says: