This article presents a new tool that supports real-time corrective maintenance of water distribution systems (WDS). This tool integrates Geographic Information Systems (GIS) with hydraulic modeling of WDS, providing a graphic interface in which, in the case of a failure, the operator can select the damaged pipe (usually a burst pipe), obtaining the following information from the support tool: (1) the exact valves that need to be closed to isolate and repair the burst pipe; (2) the amount and cost of water that is lost while the damage is not fixed; (3) the users that are left without service when closing the valves identified in (1); (4) the amount and cost of water required by users but not supplied to them because of the damage. In the developed tool, the identification of the valves that must be closed to isolate the burst pipe is carried out by means of a Recursive Iterative Algorithm (RIA). On the other hand, for the loading and display of information in the GIS, binary search and a fast ordering technique, known as Quick Sort, are used. The developed tool was applied to the WDS of Sector Estadio (250,000 inhabitants), which is a complex area of the city of Bucaramanga (Colombia); it proved to be a valuable operational tool which could also be useful for prioritizing damage repair.