Rainbow Municipal Water District (RMWD) lies 60 miles north of the City of San Diego and 75 miles south of Los Angeles in the northwestern portion of San Diego County. It encompasses the unincorporated communities of Rainbow, Bonsall, and a portion of Fallbrook, covering approximately 49,800 acres of land. The District straddles, in part, Interstate 15 and the San Luis Rey River. The area has many agricultural uses, including citrus, avocados, strawberries, tomatoes, corn, commercial nurseries and livestock. The terrain is rugged and mountainous, consisting predominantly of developed groves, with some residential areas interspersed in the more accessible valleys. RMWD is largely agricultural; however, it is expected to see significant growth in its residential customer base in the future. Much of the area still remains in its natural state of chaparral, oak and coastal sage vegetation, characteristic of Mediterranean west coast climatic regions.