The article presents the results of research aimed at defining the potential effectiveness of fire ser- vices in the city space. The spatial scope of the analysis comprised the city of Łódź and a 20-kilo- metre ring around it, which was introduced in order to avoid an artificial barrier in the form of a city boundary. The study comprised all fire departments located within this area as well as individual elements of its built environment, which may be subjected to or otherwise pertinent to interventions of fire fighters. The use of the ArcMap Network Analyst tool and the 2SFCA method allowed us to specify time accessibility of fire service operations; spatial accessibility of individual elements of the city infrastructure to fire service activities; the load of individual fire stations; and the minimum number of departments necessary to take action within the assumed, defined arrival time for intervention.