The water supply security is one of sectors in the critical infrastructure protection plan. It's getting more and more important that water protection in Taiwan, for the extreme climate and environment factors leading natural disaster frequently. When speaking of water resources protection in Taiwan, the authorities are Water Resources Agency, Ministry of Economic Affairs, Soil and Water Conservation Bureau, Taiwan Water Corporation, and the bureau of reservoirs or dams. Because of the natural and human reasons, Taiwan's water supply still faces the threats and risk that already existed.