A large male employee population with continuous low level work exposures to methylene chloride for up to 30 yr was examined for mortality experience using nonconcurrent prospective and proportionate mortality techniques. Mortality of the study group was consistent with industrial controls and less than the New York State [USA] general population. Life table analysis of the 1964 methylene chloride exposed cohort was followed through 1976 and demonstrated age group specific probabilities of 13 yr survivorship equal to or better than that of 3 control male populations: Kodak Park, New York State and USA.