Elsinore – Elsinore Valley



Located in California’s South Coast hydrologic region, the Elsinore – Elsinore Valley is 23,601 acres in size. This Medium priority basin is home to an estimated 61,419 people (2010 value), which have been at a rate of 22.69.

Elsinore – Elsinore Valley is a(n) basin with approximately 336 wells, of which approximately 17 are water supply wells. Groundwater accounts for approximately 23.66 percent of the basin’s water supply.

Source: CA DWR
Source: CA DWR

Basin Notes

2003: Bulletin 118 basin description

2016: Basin boundary modification removed the Bedford-Coldwater area from the Elsinore Basin and create the new Bedford-Coldwater Basin (8-004.02). Altered border with Upper Santa Ana Valley – Temescal (8-002.09 subbasin.

2018: Draft basin priority – medium. Comments:

  • Groundwater level – The Elsinore Basin may be in a state of overdraft (about 4,400 acre-ft/yr. Source: Elsinore Valley Municipal Water District 
  • Subsidence – 1) Evidence for GW pumping that induced fissures was that several new wells began pumping in the days and weeks before subsidence was noted, and that since pumping stopped the fissures have not increased in number or size Source: USGS Land subsidence interactive tool Two areas of subsidence: 1) Wolf Valley area fissures advanced 7 miles northward (Earth Consultants, 2000) — fissures primarily controlled by faults (Shlemon & Hakakian, 1992) but other researchers believe that the fissures formed when increased GW pumping caused inelastic compaction and subsidence (Shlemon and Davis, 1992). 2) Fissures in Murrieta California Oaks subdivision caused by hydrocompaction upon wetting, not due to GW extraction. Source: Areas of Land Subsidence in California, USGS

2018 Final Basin Prioritization: Basin priority changed from high to medium priority.

GSA Information