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Most of Surabaya area is lowland, which is 80.72% with an altitude between 3-8 meter above sea level with a slope of less than 3%. Therefore, the city drainage system requires pump station operations to drain rainwater. One of the factors that can hinder the performance of pump stations in flood management is the damage to the drainage pump unit. This study has succeeded in finding motor damage as the type of dominant damage at drainage pump in Surabaya. The analysis of the types of dominant damage using the Analytical Hierarchy Process (AHP) by determining the type of dominant damage as the objective in the first level hierarchy, the dominant damage criteria are at the second level, and the types of damage are at the third level as an alternative decision. The types of damage are obtained by processing historical data of pump damage in 2017 to 2018, while the criteria for determining the dominant type of damage and the assessment in the AHP analysis are obtained from interviews and questionnaire with experts from the Surabaya city government and pump companies. The results of this study can be used to find the dominant causes of damage and forms of mitigation.