Data from this summer: https://almanacnews.com/news/2021/07/12/state-expands-drought-emergency-to-santa-clara-san-mateo-counties https://almanacnews.com/news/2

Data from this summer: https://almanacnews.com/news/2021/07/12/state-expands-drought-emergency-to-santa-clara-san-mateo-counties https://almanacnews.com/news/2021/07/12/state-expands-drough... Apparently Crystal Springs is intentionally being kept full in case of wildfires. It's the emergency reservoir for San Francisco and northern San Mateo County.