The Metropolitan Water District of Southern California manages a library and archival repository documenting the activities of the organization and resources of interest to the greater history of the Los Angeles region. 

The materials of the Regional History Collection document 100 years of Southern California history in various formats. The collection was founded in the mid-1970s as a repository for the papers of Southern Californian political figures, among them Governor Jerry Brown Jr., Congresswoman Yvonne Brathwaite Burke; and Congressmen Alphonso Bell, Chet Holifield, Craig Hosmer, and Gordon McDonough.