Chaffey Joint Union High School District is a 9-12 school district located in San Bernardino County, California that serves the communities of Ontario, Montclair, Rancho Cucamonga, and portions of Fontana, Upland, Chino, and Mount Baldy. With more than 25,000 students, it is one of the largest high school districts in California. The District operates eight comprehensive high schools, one online high school, one continuation high school, one community day school, and one adult education school.HistoryThe union high school district began in 1882 when George and William Chaffey, the founders of Ontario, began the Chaffey College of Agriculture and an on-campus secondary school with assistance from the University of Southern California. Ironically, the university abandoned the agricultural school while Chaffey was away in Australia, so he pursued litigation and eventually won. In 1901 control of the secondary school was given to the local community and it was named Ontario High School, only to be renamed Chaffey High School in 1911. It would be the only secondary school in the area until end of World War II when an increase in Ontario's population prompted additional schools.
