Reviews regulations in the U.S. affecting refrigeration leakage. Describes how the supermarket industry has been successful in reducing refrigerant losses to the extent that newer stores can achieve emission rates of 15% of the charge per year. Actions to achieve this goal were concentrated in design and construction, operations and maintenance and corporate policies and practices. Note the additional benefits of reduced construction costs, reduced energy costs and reduced maintenance calls. Illustrates one year of service data for a supermarket chain with 110 stores.