Clean water is an essential basic requirement for humans. In eastern Indonesia, especially the provinces of East Nusa Tenggara (NTT), Maluku, and Southeast Sulawesi, the need for clean water is quite urgent. The socio-cultural conditions, geographical conditions, low rainfall levels, and the distribution of freshwater from the Regional Water Company (PDAM) is still not right. In the three provinces, communities utilize clean water buying and selling services using tank cars to fulfill their daily needs for clean water in reservoirs and water tanks. Orders still use telephone or SMS, so it is slower. Thus, the design of mobile ordering applications for clean water was proposed in this study and was named Go-Water. With the Go-Water app, users order clean water by choosing the closest shelter model and driver, and then the order is forwarded to the driver for processing. The User-Centered Design (UCD) method use for GoWater application design. The Go-Water application help users to order clean water quickly and help improve business quality for service providers. The usability perspective analysis results on the Go-Water application design obtained an average percentage of 83%. This study’s contribution is the design of the proposed mobile application centered on the user. Previously, there was no system for ordering 5,000 liters and 6,000 liters of clean water using a tank car. The price offered was more beneficial for both parties.