The purpose of this standard is to establish the characteristics that must be met by the water used for both mixing and curing of concrete, mortars and control pastes (without additives) and reference (with additives) (UNE 83-255), manufactured with cements, sand and control aggregates, whose characteristics are specified in standards UNE 83-255 and UNE 83-257, as well as without and with the additives defined in standard UNE 83-200.