The aim of the present paper was to evaluate the survival rate of Listeria monocytogenes in meat processing industry sewage, depending on the pH under laboratory conditions. In the present experiment we determined the time of survival of listeria bacilli in three kinds of sewage: crude, alkalized and acidified. The present research shows that Listeria monocytogenes survived longest in crude sewage where, as calculated with the use of regression analysis, theoretical time of survival was defined as 38 days, while in the alkalized sewage and acidified sewage the time was 33 and 25 days, respectively. Besides, the present experiment also investigated the potential of listeria bacilli survival in sewage under strongly acidic and alkaline conditions.