The State Department of Agriculture shall cause a thorough inspection of every plant or establishment licensed under ORS § 628.220 to 628.240 to be made periodically, to determine whether or not the premises and equipment used in connection therewith are constructed, maintained and operated in accordance with the requirements of ORS § 628.210 to 628.370 and with the rules and regulations of the department thereunder promulgated. Such locker plants shall be maintained in a clean, healthful and sanitary condition at all times.