Ive heard the Santa Rosa water going into the brewery is fairly mineral free, and that they load up brewing salts depending on styles. Pliny gets a ton of sulfates added, for example. No idea on the pils, but I've had it many times and the water doesnt taste nearly as mineralized as pliny, it does have a nice crispness though. It does have quite a bit of sulfur, which I'd venture to guess is mostly the yeast