Deformation of the dam is one of the components that must be monitored periodically. Remote sensing, especially with active sensors, can be a solution for quick assessment in observing dam deformation. Dams as objects that have large dimensions and relatively fixed positions increase the opportunities for applying remote sensing to observe deformation. This research aims to compare the vertical deformation that occurs in dams using DInSAR-based Sentinel-1A imagery with measurements using land survey method (leveling method). The results show that the vertical deformation values, both land survey and DInSAR measurement methods, have the same average value. Land survey measurements have an average vertical deformation of -6 mm and DInSAR of -6 mm with a standard deviation of both data of ± 2 mm. Both methods can produce mm to cm deformation accuracy. The advantage of land survey measurements is higher per-point accuracy than the DInSAR method. While the advantage of DInSAR is that it covers a wider area. The DInSAR method can be a solution to fill data gaps or quick assessments when needed and is supported by the availability of data.