The Norwesco 7750 Gallon Plastic Water Storage Tank (SKU N-44123) is a vertical polyethylene tank built for large-volume bulk water storage, where a single tank does the work that smaller arrays struggle to match. It stands 122 inches tall on a 144-inch diameter, holds 7,750 gallons, and ships from the Norwesco plant in Hanford, CA. This is a serious piece of equipment for ranch and agricultural supply, fire-water reservoirs, industrial process water, and rainwater and reuse aggregation.
Will it work for your application?
The tank is molded from polyethylene in green and carries a 1.1 specific gravity rating, meaning it is engineered for the weight of water and water-like contents up to that density. Filled with water, the contents alone weigh 64,635 pounds, and the tank is rated to a maximum contents weight of 71,098 pounds. That roughly 6,463-pound gap is exactly what the 1.1 rating buys you: 64,635 x 1.1 lands at 71,098, so it is the weight margin available before a slightly-denser-than-water fluid hits the ceiling. Because this is a vertical (round) tank, the 144-inch dimension is the diameter, so plan for a 144-inch round pad, or a 12.5-foot-or-larger square, fully supported with no edge overhang. Confirm every dimension against the product specifications and the technical drawing on this page before you pour the pad or trench your supply line. For pad design on a tank this size, read our Concrete Pad Sizing for Above-Ground Polyethylene Tanks guide, which works through the ACI 360R-10 framework.
Sizing and commissioning
If you are still deciding between this 7,750 gallon vertical storage tank and a different capacity, our Tank Sizing Calculator and Tank Sizing Guide help you match storage volume to draw rate and refill schedule. For fire-protection storage specifically, our Fire-Water Reservoir Tank Design guide covers NFPA 22 sizing discipline and cold-climate freeze protection. When the tank is installed, follow our Hydrostatic Test Methodology to fill in stages, monitor the pad for settlement, and check for leaks before you put it into service. Aggregating grey water, rainwater, or HVAC condensate? Our Industrial Water Reuse Tank Topology guide covers quality-banded storage trains. Fitting configuration is confirmed per order, so call 866-418-1777 to lock in your port layout.
The mistake to avoid
The most common error on a tank this large is underbuilding the foundation. More than 71,000 pounds of rated contents has to land on something flat, level, and fully supported across the entire 144-inch diameter, with no voids and no edge overhang. A pad that is undersized or poorly compacted lets the tank settle unevenly, which stresses the lower wall. The second mistake is the specific gravity ceiling: this tank is rated to 1.1, so it is built for water and water-like fluids, not heavier liquids. If your contents are denser than water, the rated weight numbers above no longer apply and you need a higher-SG tank. The third is delivery access: at 122 inches tall and 144 inches across, this tank needs overhead clearance and crane or equipment access at the drop point, so check your route and offload area before the truck arrives.
This tank ships LTL freight from Hanford, CA, with the cost quoted live to your ZIP code. Get a number now with our Freight Cost Estimator, or call us at 866-418-1777 to talk through delivery, offloading a tank of this size, and lead time. Norwesco vertical water storage tanks like this one are made to anchor a bulk water system for years.
3 Year Warranty
