Watermain's failure index modeling via Monte Carlo simulation and fuzzy inference system

•A moderate risk of failure status is corresponded to 62.3 failure index (FI).•The developed method is implemented on the water system of the City of El Pedregal in Peru.•This research provides insights for infrastructure managers in the aspects of when to intervene.•The eight factors that cause the degradation and failure of water infrastructure were characterized to develop the Monte Carlo Simulation Model.