Now for a widespread myth about this profession: many folks believe that "food inspectors" are the same personnel who drop by restaurants unexpectedly to check on kitchen safety and ensure that all food products have been properly obtained and kept. Such professionals, however, belong to a separate category: most "health inspectors" work for the State Department of Health (rather than the USDA).
Health inspectors must have a professional license to conduct their profession, and they, like food inspectors, do the majority of their work in the field rather than in an office. According to Payscale, the national median compensation for health inspectors is $43,340.