GIS is a tool to manage a spatial data and other support-ing information based on geographic information. These data collecting and management system can support the decision making process in environmental management. GES has the expertise in developing GIS that can be used by clients in implementing their environmental manage-ment. Currently, GES is developing an Integrated GIS for Public Water Treatment Plant that consists of distribution and accessories asset management, customer data, payment data history, etc. GES has been continuously developing GIS utilization for the other environmental services, e.g. the urban drainage system and hydrology management in order to support the water resource management in Indonesia.