We are storing as much as we are structured to be able to save. Most of California’s water storage is in the snowpack in the Sierra, which is currently at 250% of normal.
And there are dams at the bottom of most of the rivers. They have risen from 30% of capacity to 40% of capacity in the last three weeks.
The reservoirs in Marin County are at 100% and are spilling, there isn’t room to store anymore water there.
The aquifers in the state have been so depleted, that it would take many more months such we have had this month for the groundwater to replenish, and it would need to do so for many years.
Improving capture of rainfall is being actively discussed up and down the state.