Castaic, California (also Castec, or Kashtiq), is a rural unincorporated community located in the northern part of Los Angeles County, California. Many thousands of motorists pass through Castaic daily as they drive to or from Los Angeles on Interstate 5. Castaic Lake is part of the California Water Project and is the site of a hydro-electric power plant. Castaic is located approximately northwest of the downtown Los Angeles Civic Center and about north of the city of Santa Clarita, California.