Food plays a key role in an individual's life. Therefore, it is important that during the preparation, processing and distribution of food, laws and rules are respected, which stipulate that the end product is a healthy product. Disinfection, disinsection and pest control (DDD) enable key protection processes in establishments that deal with food. They are carried out as part of mandatory preventive measures of disinfection, disinsection and pest control as special measures. The purpose of implementing DDD measures is to prevent the occurrence and reduce the risk of infectious diseases and their spread. The implementation of these measures is determined by the Legal Regulation as well as the Program of Measures for the Implementation of Mandatory DDD Measures. In accordance with the legal regulations, the measures are carried out by the authorized contractors. The correctness and effectiveness of the implemented measures is carried out by expert or inspection supervision. Expert supervision over the implementation of mandatory (preventive) DDD measures is carried out by the competent Institute of Public Health, while the State Inspectorate is responsible for inspection supervision. In addition to the implementation of DDD measures, the system of self-control – analysis of hazards and control of critical points (HACPP) plays an important role in ensuring the healthiness of groceries. The aim of this paper was to point out the importance of implementing DDD measures in facilities that deal with food and the importance of monitoring the implemented measures in order to ensure the healthiness of the final product. For the purpose of this paper, expert supervision of the shopping complex in Rijeka was carried out. Various impressions of surfaces and objects of general use were taken and analyzed at the Teaching Institute for Public Health of the Primorje – Gorski kotar Country. The measures must be implemented in accordance with expert provisions and legal regulations.