It's normal. California has a long geological history of thousands of years of drought. Tree rings and live trees by the lakes in California had proved the geological history of drought.
The problem is that builders and developers had ignored soil scientists, geologists, agronomists, and geological history for years by keep building more houses and buildings and planted grasses and gardens instead that don't belong in desert in California.
If it were not for semi-desert climate, Hollywood, and Silicon Valley to attract people to come to California, then there'd be water problems. California population had increased, but the water storage systems hadn't.
My dad is a retired soil scientist and agronomist with Soil Conversation Service in California, and knows California geological history, and crops well. He had warned everyone so many times that water storage systems must be built, but environmentalists and their campaigns managed to prevent new water storage systems.