This regulation establishes an exemption from the requirement of a tolerance for residues of phosphorous acid and its ammonium, sodium, and potassium salts in or all food commodities to allow for post-harvest application to stored potatoes at 35,600 parts per million (ppm) or less of phosphorus acid. This exemption is being issued at EPA's own initiative under the Federal Food, Drug, and Cosmetic Act (FFDCA), as amended by the Food Quality Protection Act of 1996 (FQPA), requesting an exemption from the requirement of a tolerance. This regulation eliminates the need to establish a maximum permissible level for residues of phosphorous acid and its ammonium, sodium, and potassium salts.