The objective of the survey was to find what the customers of bistro bars knew about the food production hygiene. The survey results obtained reflected the level of customer knowledge in this field; they constituted an attempt to find whether or not the socio-demographic factors were significantly important for the perception of this issue. The survey covered bistro bars in one petrol station network selected in the 9 previously chosen provinces of Poland. The survey was conducted in 2008 and consisted in anonymously polling 282 customers using questionnaires. The survey results showed that the average customer was aware of the importance of food production hygiene and, also, was critical when giving his opinion on both the quality of food products and the quality level of services in bistro bars of the selected petrol station network. The study shows that clients with higher and post-secondary education level show a higher sensitivity than the others in relation to taking care at preparing and serving meals in bistro bars, and have the greatest reservations about the appearance of hygienic products that are offered.