A dishwasher comprises a wash chamber, a water circulation system for passing water into and out of the wash chamber, and a water-collecting sump member (12) which is fastened in a water-tight manner to an opening (14) in a lower end portion of the wash chamber. The sump member is a self-contained molded plastic unit comprising an upper portion which constitutes an interface for connecting the sump member in a water-tight manner to said opening (14), and a lower portion comprising a water collecting receptacle, wherein said upper portion comprises at least one integral fitting for connecting the sump member to a water inlet conduit and/or a drain conduit of the dishwasher.