The Norwesco 305 Gallon Plastic Water Storage Tank (SKU N-40702) is a vertical polyethylene tank that stands 50 inches tall on a 46-inch-diameter footprint and holds a full 305 gallons of water. At capacity it carries 2,544 pounds of contents, so the pad and any structure beneath it have to be rated for that load. If you have been searching for a Norwesco water storage tank or a vertical storage tank to anchor a water-storage supply, this is a compact, freestanding option for tight installs.
Will it work for your application?
This tank is rated to 1.0 specific gravity (roughly 8.34 lb per gallon) - in plain terms, do not store any liquid heavier than water in it. The polyethylene wall is engineered for water and comparably light liquids, not heavier chemical service. Use the 305-gallon working volume and the 2,544-pound full weight to size your stand, pad, and plumbing run. The 46-inch diameter and 50-inch height keep it short enough for low-clearance spaces while still holding a meaningful reserve. Run your numbers through the Tank Sizing Calculator and read the Tank Sizing Guide before you commit, so the volume and footprint match your draw rate and the space you have.
Pad, install, and getting it right
A vertical tank this size needs a level, fully supporting base. Plan the foundation from the full 2,544-pound contents weight: spread across the 46-inch-diameter footprint (about 1,662 square inches), that works out to roughly 1.5 psi, or about 220 pounds per square foot of static distributed load. Our Concrete Pad Sizing for Above-Ground Polyethylene Tanks guide walks the ACI 360R-10 framework for that calculation. Once the pad is set, confirm the install with a controlled water fill following the Hydrostatic Test Methodology walkthrough to watch for pad settlement and fitting leaks before the tank goes into service.
The mistake to avoid
The fitting layout governs how you plumb this tank, so confirm available fitting locations and sizes against the technical drawing on this page, and call us at 866-418-1777 to verify them before you order valves or plumbing - it is the cheapest step in the whole install to get right. The other guardrail is that 1.0 specific-gravity rating: if your liquid is heavier than water or you need chemical-service rated storage, do not force this tank into that duty. Call us and we will point you to the right tank for the job. If this 305-gallon unit is one piece of a larger system, two engineering guides are worth a read - the Fire-Water Reservoir Tank Design guide for rural and remote private fire-protection stacks and cold-climate freeze protection, and the Industrial Water Reuse Tank Topology guide for grey-water, rainwater, and HVAC-condensate aggregation into quality-banded storage.
This tank ships LTL freight from the Norwesco plant nearest your delivery ZIP, drawing from regional plants in Fairfield, TX; Griffin, GA; Hanford, CA; Lancaster, OH; Owego, NY; Shawnee, OK; Tooele, UT; and Washougal, WA. Get an exact freight cost with the Freight Cost Estimator or call 866-418-1777 and we will quote it to your ZIP.
3 Year Warranty
