The collection consists of reports and papers on various aspects of sewerage, sewage treatment, groundwater and surface water pollution from municipal and industrial wastes, water quality, and sewage treatment systems for many California municipalities.

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 records from the Sewerage Agency of Southern Marin, a Joint Powers Agency formed in 1979 to consolidate the wastewater collection, treatment, water reclamation and disposal needs of residents in Southern Marin County. Types of materials in the collection include meeting minutes, correspondence, clippings, and referendums.

The collection consists of materials documenting the water treatment related activism of Jack and Nancy Skinner from 1980-2000. Notable materials include work related to the prevention of the use of 301h waivers by sewage treatment plants in the 1980s.