While I was in Tokyo my basement began to flood. Research has determined that the source is an artesian spring that puts out about 20 gallons an hour. After I have the water quality tested, you may be able to buy Upper Castro bottled water.
My main concern about a spring that suddenly appears during the summer is that the ground water in San Francisco has shifted for tectonic reasons. Before the massive San Francisco earthquake of 1864, the ground water that fills Lake Merced dropped. My children all went to high school within view of Lake Mercer and I asked them to phone me immediately if the level of the lake dropped.
Could my Upper Castro Spring Water be a precursor to the next big earthquake?