The Enduraplas 870 Gallon Black Vertical Water Storage Tank is a 78-inch-tall polyethylene vertical tank that holds 870 gallons on a compact 60 x 60 inch footprint, which makes it a workable choice when you need real volume but have limited slab space. The opaque black shell blocks light, helping discourage algae growth in stored water, and the tank carries a 1.1 specific gravity rating, meaning it is built to safely hold contents weighing up to 1.1 times the weight of water. If you are shopping vertical storage tanks or general water storage, this is a straightforward bulk-water vessel.
Will it work for your site?
Plan your pad and plumbing around the real numbers, and verify them yourself. At 870 gallons of plain water (8.34 lb/gal), the contents weigh 7,256 lb, which matches the full-water figure exactly. Multiply that by the 1.1 specific gravity rating and you reach the 7,981 lb maximum rated contents weight. In practical terms, that ceiling means water-like fluids up to roughly 1.1 SG, or about 9.18 lb per gallon, are within spec. Use the higher 7,981 lb number when you size the foundation. The footprint is 60.0 x 60.0 inches and the tank stands 78 inches tall, so confirm overhead clearance for the lid and any fill plumbing before you set it. If you are choosing between this and another size, run the numbers through our Tank Sizing Calculator and read the Tank Sizing Guide. For inlet, outlet, and lid details, see the technical drawing on this page.
Setting it up right
A tank this heavy needs a properly engineered base. A full 870-gallon tank concentrates close to 8,000 lb on a five-foot square, so the pad has to be flat, level, and sized to carry that load without settling. Our guide on concrete pad sizing for above-ground polyethylene tanks walks through the ACI 360R-10 framework for getting that right. After installation, commission the tank with a controlled water fill rather than putting it straight into service. Our hydrostatic test methodology covers fill discipline, pad-settlement monitoring, and fitting leak detection so you catch problems before the tank goes into service.
Common mistakes to avoid
The biggest mistake on a tank like this is treating the specific gravity rating as a license to store anything. The 1.1 rating is sized for water and water-like liquids; it does not make this a chemical tank. Match the contents to the rating, and if you are storing anything denser than water, confirm the ~9.18 lb/gal ceiling covers it first. The second mistake is underbuilding the base. Because the loaded weight pushes near 8,000 lb, a pad that is fine for a smaller tank can settle or crack under this one, stressing the shell and fittings. Size the foundation to the 7,981 lb maximum rated contents weight, not to the empty tank. If this is part of a rural fire-water or water-reuse setup, our guides on fire-water reservoir design and industrial water reuse topology cover sizing and layout in depth.
This tank ships LTL freight from the Enduraplas plant in Converse, TX, with the rate quoted live to your ZIP based on your delivery location. Because the loaded tank can reach 7,981 lb, plan offload equipment and rigging around that figure, not the empty weight. Get your freight number in seconds with our Freight Cost Estimator, or call 866-418-1777 and we will quote it for you. List price is shown above and is before freight.
