Almonds and pistachios do NOT constitute a food source! They are a billion $ export crop! Potatoes, tomatoes, various fruits and other vegetables are the REAL food source, and most require vastly less water! I grew up in the San Joaquin Valley (Bakerspatch). I noticed, over time, that the towns on the west side of 99 were dying. Why? Mostly corporate farms, starting with the Bosworth's vast holdings. On the east side were mostly old time farm families, who kept their earnings IN their communites, thus nice downtowns, a movie theatre etc.
John T Johnston yes, nuts are a food source in cali - they even mak milk from nuts now ... the water shortage isn't because of nut farmers - it's because of housing developments in socal that have little or no water supply ..