The Norwesco 165 Gallon Vertical Water Storage Tank is a compact polyethylene vertical tank built for California water storage, offered here in the California-only green color. It holds 165 gallons in a 56-inch-tall body on a 31-by-31-inch round footprint, which makes it a practical pick where floor space is tight but you still need a few hundred pounds of usable reserve. Whether you are setting up a rural gravity-feed line, a backup supply, or a draw tank for irrigation, this vertical storage tank slips through a standard gate or doorway and sits on a modest pad.
Will it work for your site
This is a vertical water tank rated at a 1.0 specific gravity, meaning it is engineered for water and water-weight liquids - not for heavier chemical contents. Filled to capacity, 165 gallons of water weighs about 1,376 pounds, and that full water weight is also the maximum rated contents weight for the tank, so plan your pad and supports for roughly 1,400 pounds when full. The body stands 56 inches high with a 31-inch diameter, so the 31-inch round shell clears a standard 32-inch gate or doorway opening - useful if the tank has to pass through a fence line or into a pump house. If you are unsure how this 165-gallon size lines up with your daily draw or storage goals, run the numbers through our Tank Sizing Calculator or read the Tank Sizing Guide before you commit to a capacity.
Pad and installation
A full tank concentrates roughly 1,376 pounds onto that 31-inch round footprint - about 2.9 square feet, or close to 475 pounds per square foot of bearing pressure - so the supporting surface matters. A level, properly sized pad keeps the base evenly loaded and prevents the settlement that can stress a poly tank. Our guide on concrete pad sizing for above-ground polyethylene tanks walks through the ACI 360R-10 framework for getting that base right. After the tank is set and plumbed, the hydrostatic test methodology for new-install acceptance covers the water-fill discipline, pad-settlement monitoring, and fitting-leak checks worth running before you put the tank into service. For rural fire reserve or remote-site supply, our fire-water reservoir design guide covers NFPA 22 sizing discipline and freeze protection for cold climates.
The mistake to avoid
The most common error with a tank like this is putting the wrong liquid in it. The 1.0 specific gravity rating means this tank is designed for water; it is not rated for heavier or aggressive contents. If your plan involves anything beyond water, or you are aggregating grey-water, rainwater, or HVAC condensate streams, review the industrial water reuse tank topology guide to confirm this storage tank suits your service before filling. Need a higher specific-gravity tank for heavier or chemical contents? Call 866-418-1777 and we will match you to the right rating. One more check: fitting and bulkhead or gasket configuration is not listed in the spec data for this unit, so confirm any outlet, fitting, and gasket locations against the technical drawing on this page - or by phone - before you finalize the plumbing.
Note that this is the California-market SKU: the green-tint shell ships from the Norwesco plant in Hanford, California, so buyers outside California should confirm routing and availability before ordering. This Norwesco vertical water storage tank moves by LTL freight, quoted live to your ZIP. Get a number with our Freight Cost Estimator, or call 866-418-1777 to confirm dimensions, fittings, and the best routing for your delivery.
