This testimony concerns questions posed by OSHA about the need for a standard for field sanitation. This situation is unique in that exposure to potentially harmful agents is not limited to the workplace, but is also found in the general environment of the worker. Due to the nature of the agents, discussion of the problem must be beyond strictly occupational considerations in to the broader areas of general public health. Infectious diseases discussed include diarrhea, hepatitis, tuberculosis, parasitic diseases, typhoid, and dysentery. Urinary tract infections and heat exposure are also considered. Information on the number, location and migratory patterns of farmworkers is provided. Based on the literature and on other information obtained and reviewed, NIOSH believes that a standard for field sanitation could and should be supported on the basis of the well known and long documented sanitary requirements of public health practice and the need for equalization of working conditions with other occupational groups.