The coastalarea of Padang City has experienced rapid development, marked by the rapid construction of hotels and its status as a tourist destination. The dense population and the large number of tourists in this area have led to increased groundwater use. This study aims to determine the extent of seawater’s influence on groundwater. The research was conducted through field surveys and measurements, as well as laboratory testing of groundwater samples. The GALDIT method was used to analyze vulnerability to seawater intrusion and validated using geo-indicators to assess the impact of seawater on groundwater in the study area. The results showed that Padang Barat District, located in the coastal area, has a low-medium vulnerability, Padang Selatan District, Padang Timur, and Lubuk Begalung District have a low vulnerability. Based on geo-indicators analysis, two samples were categorized as moderately affected (SG-13 and SG-15); nine were low impact, and the remaining 16 were unaffected.