The collection consists of materials related to Microbial and Disinfection Byproducts Rules (MDBPs) published by the U.S. Environmental Protection Agency (EPA), which regulate drinking water exposure to disinfection byproducts.

The collection consists of transcripts of the proceedings of twenty-two day meetings held in Washington, D.C.; San Francisco, Calif.; Boston, Mass.; DesPlaines, Ill.; Dallas, Texas; and Denver, Colorado and minutes of proceedings from five meetings.

This collection contains correspondence, articles, press clippings and photographs regarding the professional life of Henry J. Ongerth, who worked for the California Bureau of Sanitary Engineering/California Department of Health. Ongerth was instrumental in water reclamation, Treasure Island clean-up, and Electric & Magnetic Field programs. Agencies mentioned in the collection include the Enviromental Protection Agency and American Water Works Association.