PROBLEM TO BE SOLVED: To solve the problem that, when tap-water is stored as emergency water in a tank, since residual chlorine in tap water is evaporated and bacteria may proliferate in water, the water becomes undrinkable soon.SOLUTION: In a structure of a drinking water storage tank, a gas part in a top of the tank is reduced into small cubic capacity, bacteria coming in from a vent hole mounted thereon is sterilized by a bactericidal lamp, and bacteria in replenished water coming from a replenishment water pipe mounted thereto is also sterilized by the bactericidal lamp, such that bacteria cannot be carried into water. Thus, low-power sterilization can be performed and when taking out internal water, water is temporarily put into a small dispensation tank including a sterilization function and then distributed after also including the sterilizing action.【課題】非常用の水として水道水をタンクで保存すると、水道水中の残留塩素が蒸発してしまい水中で雑菌が繁殖するため、やがて飲めなくなる。【解決手段】タンク頂部の気体部を小さな容積にしぼり、そこに取付けた通気口から入って来る雑菌は殺菌灯で殺菌し、又、そこに取付けた補給水管から入ってくる補給水中の雑菌も殺菌灯で殺菌し、水中に菌を持ち込ませないようにし、低電力での減菌を可能とし、内部の水を取り出す時には殺菌機能を持った小出水槽に一度入れて殺菌作用も持たせてから配水する事を特徴とする飲料水備蓄タンクの構造。【選択図】図１
