Before World War II and shortly thereafter, there was no entity in existence to maintain the roads in Diablo. Rumor has it that a resident on Alameda Diablo would contact his neighbors and attempt to collect sufficient funds to maintain Diablo roads. In those days, many of the homes Diablo were second homes and so there was not a great deal of interest to spend money to maintain Diablo roads for the benefit of permanent residence. At some point the Diablo property owners Association (DPOA) was formed to make the collections for road maintenance but this failed also.
At some point shortly after World War II the Diablo Public Utility District (DPUD) was formed for the express purpose of having in place a secure government entity which could collect the road maintenance fees thorugh the tax process. Sometime in the early 1950s, DPUD issued two bonds. The first was for the complete rebuilding of Diablo roads and the second was to fund the annexation of Diablo to the Central Contra Costa Sanitary District. These bonds were paid off about 1980. Since most municipal bond issues are 30 year bonds, it appears that the original bonds were issued about 1950 which suggests that the DPUD was formed about 1950. After the bonds were paid, the property in Diablo continued to be assessed a small amount to continue with the maintenance of Diablo roads.
In 1967 most Diablo residents felt that additional security would be beneficial to the Diablo area. A public utility district did not have the authority under California law to provide police protection to the community at large. Since a community service did have that authority, the DPUD was reorganized to provide that all of its assets and liabilities were transferred to a new Diablo Community Services District. The last directors of deep DPUD were Art Mohr, President, Al Latten, Bob Cuenan, Joe Ragusa, and blank. The first directors of the Diablo community services district were Bill Cronin, President, Joe Ragusa, Jack ?, Jim Stone and Steve Jones.
In 1975 a group of residents residing in Danville attempted to incorporate Danville as a city. Included within the boundaries for the proposed city of Danville were Diablo, Round Hill and parts of Alamo. Most residents of Diablo wanted to retain their identity and opposed inclusion within the boundaries of the proposed city of Danville. Since Danville had substantially more voters than Diablo, a novel defense was used. A group of Diablo property owners including Paul Corteze , Jim Stone, Diablo filed a separate petition for incorporation of Diablo as a city. Round Hill and Alamo followed suit. At this point the Contra Costa County Local Agency Formation Commission (LAFCO) denied all four applications. Danville\'s next application for incorporation excluded Diablo, Round Hill, and Alamo and the city of Danville was approved by LAFCO and the voters.
DCSD has the authority to maintain the roads, culverts, and bridges in Diablo, provide police protection provide street lighting, and maintain a short pedestrian/equestrian path between Alameda Diablo and Mount Diablo scenic Boulevard. When DCSD was created, the district used private patrols to provide security in Diablo. That did not work and shortly after its creation, the district entered into a long and positive relationship with the Contra Costa County Sheriff\'s Department. The Sheriff’s Department provides a deputy who is permanently assigned to Diablo. In addition, a second and third deputy provide additional coverage so that there is a deputy sheriff on site from 8 to 16 hours each day.