The Norwesco 40 Gallon Plastic Water Storage Tank (SKU N-41536) is a compact vertical polyethylene tank measuring 18-inch diameter x 42-inch height, sized for tight spaces where a full-height storage tank will not fit. With a 40 gallon capacity and a 1.0 specific gravity rating, it is built for water and water-density liquids: hauled water, rainwater capture, livestock supply, and small water reserves. If you have searched for a Norwesco vertical water storage tank in this gallon range, this is the size that splits the difference between a portable jug and a yard-scale stationary tank.
Will it work for your install?
At 40 gallons of water, the tank carries roughly 334 pounds when full, which is also its maximum rated contents weight. That number drives every decision downstream: the pad, the stand, and the plumbing all have to carry a third of a ton in a single 18-inch circle. The vertical profile concentrates that load, so the surface under it needs to be flat, level, and continuous. If you are putting it on a platform or an elevated stand, size the structure to the full 334 pounds plus a safety margin, not the empty tank weight. The tank ships LTL from central Texas, so if you are far from there it is worth pulling a live freight number early with our Freight Cost Estimator. Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm this 40 gallon size matches your draw-down and refill cycle before you buy.
Mounting, pad, and the mistake to avoid
The most common error on a tank this tall-and-narrow is treating the footprint as forgiving. An 18-inch diameter base under 334 pounds puts real pressure per square inch on whatever it sits on, and a small tilt at the base becomes a large lean at the 42-inch top. Set it on a load-rated, fully supporting surface. For an above-ground concrete pad, our Concrete Pad Sizing for Above-Ground Polyethylene Tanks guide walks the ACI 360R-10 framework. Before you commission a new install, run a controlled water fill and watch for pad settlement and fitting weep using the method in our Hydrostatic Test Methodology guide. Refer to the technical drawing on this page for fitting locations and the exact tank profile, and confirm the outlet and lid sizes there match your plumbing before ordering.
Where it fits in a water system
Forty gallons is a working buffer, not bulk storage. With a 1.0 specific gravity rating, keep it to water and water-weight liquids; it earns its place as a make-up tank, a small pressure-feed reservoir, a rainwater catch point feeding a larger system, or a freeze-protected reserve at a remote site. If you are aggregating grey-water, rainwater, or condensate, see our Industrial Water Reuse Tank Topology guide for where a tank this size belongs in a multi-stage train. For private fire-protection water reserves at rural and remote sites, our Fire-Water Reservoir Tank Design guide covers NFPA 22 sizing discipline and cold-climate freeze protection.
This tank ships LTL freight from the Norwesco plant in Burnet, TX, with freight quoted live to your ZIP. Get an exact number with our Freight Cost Estimator, or call 866-418-1777 to talk through sizing, fittings, and delivery before you order.
3 Year Warranty
