It is a study and detailed design of water supply systems in 13 towns of Lao PDR to provide high-quality water supply services that meet the standard, align with the service area, and are sufficient to meet the water demand in the future. The construction details are as follows: The total generation capacity is 760 m3/h (18,240 m3/day), the total water supply service area is 147 km2, the total number of villages in the project area is 71 villages and the total population is 154,207 people.