The 15500 Gallon Plastic Water Storage Tank from Norwesco is a vertical polyethylene tank standing 244 inches tall on a 141-inch diameter footprint. At full water capacity it holds 15,500 gallons and carries a 1.0 specific gravity rating, sizing it for water and other contents at the density of water. This is bulk vertical storage for sites that need real reserve volume - municipal and rural water storage, fire-water reservoirs, and industrial process or reuse storage trains.
Will it work for your site?
The tank measures 244 inches high by 141 inches in diameter, so confirm your overhead clearance and pad space before ordering - a 141-inch round footprint needs a properly engineered base. The technical drawing on this page reflects the current build, which has been revised for a 22-inch lid, giving you a 22-inch manway for inspection, cleanout, and internal access on a vessel this tall. The listed spec covers that lid; outlet, bulkhead fitting, and gasket details are not published for this model, so confirm the outlet and fitting sizes you need at quote time by calling 866-418-1777. Filled to capacity with water, this tank reaches 129,270 pounds of full water weight, which is also the maximum rated contents weight. That load drives everything about your foundation: a tank this size belongs on a flat, fully supporting concrete pad. Our concrete pad sizing guide walks through the ACI 360R-10 framework for above-ground polyethylene tanks of this scale.
Sizing and commissioning
If you are still working out whether 15,500 gallons is the right reserve for your demand or fire-flow requirement, run the numbers with our Tank Sizing Calculator and the Tank Sizing Guide before you commit to a footprint this large. For fire-protection reserves specifically, our guide on fire-water reservoir tank design covers NFPA 22 sizing discipline and the polyethylene tank's role in a private fire-protection stack. Once the tank is set, a controlled first fill matters: our hydrostatic test methodology covers water-fill discipline, pad settlement monitoring, and fitting leak detection so you catch any pad or fitting issue before the tank is in full service.
The mistake to avoid
The single most common error on a tank this large is treating it like a smaller tank when it comes to the foundation and the contents. Your pad has to carry the full 129,270-pound load when the tank is brimming and keep a 244-inch-tall vessel stable when it is empty - an undersized or unlevel base will not do both safely. And because it carries only a 1.0 specific gravity rating, it is matched to contents at or below the density of water (about 8.34 pounds per gallon); anything heavier needs a higher-SG-rated Norwesco vertical, so request that rating at 866-418-1777 before ordering rather than overloading this one. If you are exploring grey-water, rainwater, or HVAC condensate aggregation into a banded storage train, our industrial water reuse tank topology guide shows where a vertical storage tank like this fits.
This tank ships LTL freight from the Norwesco plant in Hanford, CA - a West Coast origin that drives the freight number more than anything else, so buyers in the Midwest and Northeast should plan accordingly. At this size it is LTL-only and quoted live to your ZIP: get a number in seconds with our Freight Cost Estimator or call us at 866-418-1777. Plan the offload and pad ahead of delivery so this large vertical storage tank is set right the first time.
3 Year Warranty
