The water there is pretty hard and has a lot of chloride and sulfate (ratio close to 1:1). I use to live in the Otay water district and only used bottled/RO water for drinking. Down there I would stick to purchased water and treat accordingly unless you go to an in-house RO unit.
Something is always fermenting....
"It's Bahl Hornin'"
Kegged: Sour Saison, Pale Ale, Aggie Ale, Firestone DBA, De Koninck Blonde
Bottled: Belgian Quad (Grand Reserve), Derangement (Belgian Dark Strong)
On Deck: Pliny the Younger