Minn. R. 4626.1290
COVERING RECEPTACLES. 5-501.113
Receptacles and waste handling units for refuse, recyclables, and returnables must be kept covered: A. inside the food establishment: (1) if the receptacles and units contain food residue and are not in continuous use; or (2) after they are filled; and B. with tight-fitting lids or doors if kept outside the food establishment.