Just read this article on San Diego brewing water. Reminded me of this thread and thought you all might find it interesting.
http://www.westcoastersd.com/2012/04/24/into-the-brew-it-really-is-in-the-water
I am in San Diego's Helix Water District. I use the tap water with a charcoal filter and campden tablet for chloramine for my Ales. I have yet to do a lager but plan on using 75% RO and 25% filtered tap water. My tap is a pretty good mid-range water for ales.