The collection consists of correspondence, news clippings, memoranda, office files, legal documents, drafts of legislation, and transcripts of hearings. Principal topics include area planning, flood control and drainage, garbage and refuse collection and disposal, sewerage and industrial wastes, water quality management, water resources development (both state and federal), and water supply and distribution.

The collection consists of correspondence, reports, data, minutes, speeches, and clippings related to the associations, water supply in Contra Costa County and Solano County, and salt water encroachment in the San Francisco Bay Area.