See NSF section for more information: NSF is a private company which sets standards for the food service industry. Standard 59 is the group of standards used to be in compliance. No state can require NSF approval as this would be like your state making a law that you could only shop at walmart. However some states do require carts to meet nsf standard 59, our carts do meet and exceed these standards. yes! Our carts have been approved in every state Our exterior is 100% NSF Compliant Stainless steel grade 304. All sinks, lines, tanks, valves, pans and lids, including condiment table pans and lids are NSF/UL/ANSI stamped.