Where does the water supply come from on the west coast?

The water supply on the West Coast primarily comes from a combination of surface water sources, such as rivers and reservoirs, as well as groundwater aquifers. Major rivers, like the Columbia and the Sacramento, play a crucial role in supplying water for agricultural, urban, and recreational uses. Additionally, water is often collected through rainfall and snowmelt, which is vital in regions like California, where seasonal precipitation varies significantly. Desalination and water recycling are also increasingly being utilized to supplement water supplies in areas facing drought conditions.