Where the Water Comes From

The water from EMWD comes from several sources:

• imported water
• ground water
• recycled water

Imported Water

Approximately 75% of EMWD’s potable water demand is supplied by imported water from Metropolitan Water District through its Colorado River Aqueduct and its connections to the State Water Project.

Ground Water

Contrary to the impression of groundwater being huge underground rivers and lakes, groundwater is the water that occupies the pores and cracks in soil and rock. The source of groundwater is either natural or artificial recharge. Natural recharge begins as rain or snow that seeps directly into the soil and rocks, or from rivers, streams, and lakes. Artificial recharge is the intentional recharge of water in ponds or spreading basins; or through the use of injection wells.

Groundwater Basins may be defined by geologic structures, such as earthquake faults or fault zones; or, they may be defined by administrative boundaries based on water quality or some other factor. Groundwater flow follows a path of least resistance (i.e. groundwater level gradient) to a point of equilibrium.

Approximately 25% of EMWD’s potable water demand is supplied by EMWD groundwater wells. The majority of the groundwater produced by EMWD comes from its wells in the Hemet and San Jacinto area, where it is also served. Some of these wells have limited production as a result of the Fruitvale Judgment and Decree. EMWD also has wells in the Moreno Valley, Perris Valley, and Murrieta areas.

More Information

• Information About Groundwater Rights

• If You Pump Groundwater...

• State & County Agencies with Water Resources Regulatory Authorities