About Surface and Groundwater

Where Does My Rainwater Go?

1. Rain falls to the earth and collects on the surface or underground.

2. Surface water flows into rivers, streams and reservoirs.

3. Groundwater is precipitation that seeps into the earth’s soils and rock formations and stored in aquifers. Groundwater is stored in underground reservoirs known as \”aquifers.\” Water can be pumped from underground reservoirs known as “aquifers” using wells.

Check out what happens to rainwater in the Greater Los Angeles County,  Ventura County and the Upper Santa Clara River Watershed:


A groundwater basin is an aquifer, or system of aquifers, that stores water beneath the surface.

Groundwater Aquifer Map

Find a location on the map below and click to identify the name and boundary of the aquifer for that location.