Especially when San Fransico has some of the nicest tap water in the country, delivered by an empressivly engineered system:

http://en.wikipedia.org/wiki/Hetch_Hetchy

I was walking around lake Elisabeth in Fremont just this afternoon marveling at the massive water pipes. There are two continuous strips of undeveloped land that go through Fremont and the South Bay that mark the travel of San Franscico's water supply.