The Enduraplas 340 Gallon Black Vertical Water Storage Tank is a vertical polyethylene water storage tank built for bulk water holding where you need real capacity in a compact 40 x 40 inch footprint. Standing 74 inches tall on a 40 x 40 inch base, this Enduraplas tank holds 340 gallons and carries a 1.1 specific gravity rating, so it is engineered for water and water-density liquids. The black resin limits light penetration, which slows algae growth in stored water - useful if the tank sits outdoors or in a lit utility space.
Will this water tank work for your site?
Start with the weight, because that is what surprises people. Filled with water, the tank and contents reach roughly 2,836 pounds. It is rated to 3,119 pounds of contents at 1.1 specific gravity - that 283-pound gap is built-in margin for water-density liquids, not a number you should fill past with something heavier than water. That load sits on a 40.0 x 40.0 inch footprint, so the surface underneath has to be flat, level, and rated to carry it; a settling or sloped base is the most common cause of stress cracking on vertical tanks. If you are pouring or sizing a pad, our Concrete Pad Sizing for Above-Ground Polyethylene Tanks guide walks through the ACI 360R-10 framework. To confirm 340 gallons matches your draw and refill cycle, run the numbers in our Tank Sizing Calculator or read the Tank Sizing Guide.
Mistakes to avoid
The biggest one with a 1.1 SG tank is putting something heavier than water in it. This vertical storage tank is rated for water and contents up to 1.1 specific gravity; if your liquid is denser than that, you need a higher-SG tank, not this one. Second, do not skip a hydrostatic test on a new install - fill it with water before you trust it, watch for pad settlement, and check every fitting connection for leaks. Our Hydrostatic Test Methodology guide covers the fill discipline and hold-time math. For inlet, outlet, vent, and lid details plus the full dimensional layout, see the technical drawing on this page.
How it ships
This tank ships LTL freight from the Enduraplas plant in Converse, TX, with freight quoted live to your ZIP. Because Converse is just outside San Antonio, Gulf and South-Central buyers should expect the lowest LTL, and cost climbs with distance from Texas. Get an exact number before you order with our Freight Cost Estimator, or call 866-418-1777 and we will walk you through it. Whether you are setting up a vertical water storage tank for rural water supply, general bulk water storage, or a backup reservoir for private fire protection - see our Fire-Water Reservoir Tank Design guide for NFPA 22 sizing - we will help you confirm the size, the pad, and the freight before anything ships.
