This standard reflects a committee consensus of industry practice concerning the design, detailing, and construction of prestressed-concrete water tanks that employ horizontal prestressing tendons in walls. This standard also addresses the use of prestressing tendons in floors, vertically in the walls, and in roofs. Recommended criteria and guidelines are presented to assist engineers in design and construction of both cast-in-place and precast concrete tanks using tendon prestressing, based on the specific detailed experience of the committee members. Engineering principles are tied to existing codes where applicable.