How is groundwater replenished?

Groundwater basins can be replenished naturally and artificially when water from the surface is allowed to seep into the soil. The Indio Subbasin is replenished naturally with mountain precipitation that flows downstream to the Whitewater River. Water agencies in the Coachella Valley also artificially replenish the groundwater with imported water that is pumped into what are known as “recharge ponds” and allowed to seep into the ground.