Many people regard SF as above average in water and bread. Water comes from Hetch Hetchy [1] and many of the regions best bakers are in SF, such as Acme [2].
A long history with sourdough (hence Lactobacillus sanfranciscensis, even though it didn't originate in California), and more recently a strong network of bakers and bakeries branching out from Chez Panisse starting in the 70's as noted in another comment.
Far, far, better for bread and cheese at least. Which I suspect means you haven't found where those are? (Cheeseboard in Berkeley, Cowgirl Creamery in the Ferry Building, Acme bread, Tartine as previously mentioned - some of these closed at the moment of course)
[I'm a cheese and bread snob from Switzerland FWIW - I could be somewhat convinced that the wholewheat bread choices are not perfect though]
It's not.