The Drinking Water Health Advisory, Office of Water, U.S. Environmental Protection Agency, has issued its report on the chemical, bromochloromethane. Bromochloromethane is primarily used as a fire-extinguishing fluid, particularly in aircraft and portable extinguishers. It is also used in organic syntheses. The report covers the following areas: the occurrence of the chemical in the environment; its environmental fate; the chemical's absorption, distribution, metabolism, and excretion in the human body; and its health effects on humans and animals, including its mutagenicity and carcinogenicity characteristics. Also included is the quantification of its toxicological effects.