The presented study focuses on the identification of the zones with a higher risk respect to THMs exposure in a
WDS. Furthermore, in order to deepen more aspects of the vulnerability analysis and then to get different
information, which can be useful for various tasks, five distinct parameters are introduced in this paper. The simplest
one to consider is the actual THMs concentration [THMs]j, calculated by equation (1). In addition to this more
intuitive factor, also the THMs average concentration Cj
THMs has been evaluated using equation (3), where T is the
total observation time (h), qj(t) is the actual demand node (l/s) and j represents the node index