You want data from the city of Los Angeles? You can get it! Here's an interesting set of figures from the city website, I discovered from a friend on Facebook (it is not all the evil empire....) Both these screen shots are from Fiscal Year (FY) 2012-2013. The figures below show the gallons of water consumed in zip codes 90063 and 90212. Zip code 90063 can be characterized as an East Los Angeles economically depressed area.
Zip code 90212 can be characterized as Beverly Hills. The disparity in water consumption is, for all practical purposes, seven fold!
So this web site can be a potent resource for gathering important data like water use by zip code - not a precise tool, but a valuable one none-the-less from which data can be extrapolated. Give it a try if you want to learn some things about the LA area... david