The Norwesco 550 Gallon Plastic Water Storage Tank (N-40703) is a vertical polyethylene water storage tank standing 44 inches tall on a 67-inch-diameter footprint, built for above-ground non-potable water storage where a wide, low stance matters more than vertical clearance. If you are sizing a buffer for a well system, a hauled-water cistern, a rainwater catchment train, or a rural fire-water reservoir, this is a stable, easy-to-plumb vertical tank that fits under most eaves and inside many outbuildings.
Will it work for your site?
At 550 gallons of usable capacity, a full tank of fresh water weighs about 4,587 pounds, and that figure is also the maximum rated contents weight, so plan your pad and supports around roughly 4,600 pounds bearing on a 67-inch circle. The squat stance is the defining buying decision for this SKU: if you have vertical clearance, a taller and narrower 550 will save floor space, so choose this one when headroom is the constraint (under eaves, in a low outbuilding) or when a low center of gravity matters. To match this tank to your daily draw and refill cycle, run the numbers through our Tank Sizing Calculator and review the Tank Sizing Guide.
Pad and install discipline
A water storage tank this wide is only as good as the surface under it. The base must be smooth, continuous, and level so the load spreads evenly across the bottom rather than concentrating on a high spot. The numbers a slab designer will ask for come straight off this tank: 4,587 pounds spread over a 67-inch circle (about 3,526 square inches, or roughly 24.5 square feet) works out to about 1.3 pounds per square inch, or roughly 187 pounds per square foot static. For a permanent install, our guide to concrete pad sizing for above-ground polyethylene tanks walks the ACI 360R-10 framework, and before you commission the tank, the hydrostatic test methodology guide covers fill discipline, pad-settlement monitoring, and fitting-leak detection. If this tank feeds a private fire-protection stack or a remote site, our fire-water reservoir design guide covers NFPA 22 sizing and freeze protection for cold-climate service. Setting up grey-water, rainwater, or condensate reuse? See our water reuse tank topology guide.
The mistake to avoid
This tank carries a 1.0 specific gravity rating, which means it is engineered for water and water-weight liquids only. At that rating, the 4,587-pound rated contents weight is the hard ceiling, not just a fill-it-up number: a fluid denser than water, at the same 550 gallons, would exceed the tank's structural rating before it is even full. Do not put any product heavier than water in it. If your application involves a denser fluid, you need a tank rated for that higher specific gravity, not this one. Treating a 1.0-rated tank as a general chemical vessel is the most common and most expensive mistake with a tank like this, so match the rating to the fluid before you fill it. Before ordering plumbing, confirm exact port locations and fitting sizes by calling 866-418-1777 to verify the current fitting configuration for this tank.
This Norwesco vertical storage tank ships LTL freight, quoted live to your ZIP from the nearest Norwesco plant. Norwesco molds at Fairfield, TX; Griffin, GA; Hanford, CA; Lancaster, OH; Owego, NY; Shawnee, OK; Tooele, UT; and Washougal, WA, so most regions ship from a facility close by. If your state is one of our stocking regions (California, Georgia, New York, Texas, Utah, Washington) you are likely shipping from a plant in or next to your state, which usually means a shorter lane and a better rate. Get an exact freight number with our Freight Cost Estimator, or call us at 866-418-1777 to confirm the best-shipping plant and lead time for your address.
3 Year Warranty
