Abstract
In developing countries, many people cannot access improved water. Although many water supply projects have been implemented by ODA, household water consumption is limited, and in rural areas untreated water is supplied. Authors surveyed ODA funded water supply projects in six developing countries from 2000 to 2006. The objective of this study is to clarify factors that influence water usage in twelve areas in four countries where measured water consumption data and water tariffs were collected. The results showed that water consumption was influenced by water tariff structure, not by income directly. Especially the mode of household's consumption is most influenced by water tariff. Authors focused on the mode of household's consumption. As house connection service charge is relatively expensive in developing countries than in developed countries, consumers in surveyed areas try to save water considering the water tariff. Small-scale irrigation is allowed at 2 projects with low charge in rural and local urban areas. The results of this study can be applied in setting tariffs with consideration of stable management, efficient management, equity and the poor.
