Abstract-An ontology, a formal representation of domain knowledge, is an integral building block of the semantic web and is important in building an application within interdisciplinary domains. In the food domain, regulations require Food Business Operators (FBOs) to comply with traceability and track-ability measures when handling food in order to assess risk. In this paper, we identify several requirements to model food, food history, and risk of contamination in order to support the safety regulations of food. Using those requirements, we also identify and apply several design principles for building an ontology called prFood that encompasses interdisciplinary domains, food and risk. In order to apply safe handling of food in the food supply chain, we integrate and incorporate the pre-existing food ontologies with prFood by implementing a mapping procedure. Finally, we validate our approach by answering several use cases derived from EU and/or UK Food Regulations.