Acquifer characteristics and hydrostratigraphy of the South Las Posas Basin, Ventura County, California

A hydrogeologic assessment was performed to study the aquifer characteristics and hydrostratigraphy of the South Las Posas Basin (SLPB), which is one of three Las Posas Valley groundwater sub-basins. The SLPB is located within the Calleguas Creek Watershed in southeastern Ventura County, California and encompasses an area of approximately 10,560 acres (16.5 sq. miles). Over 90% of SLPB groundwater demands are met through the State Water Project and supplied by Calleguas Municipal Water District (CMWD), which is not a sustainable solution for the SLPB and surrounding Las Posas Valley. (See more in text.)