The Norwesco 300 Gallon HD Vertical Storage Tank (SKU 45876) is a 300-gallon vertical tank molded in heavy-duty polyethylene, standing 78 inches tall on a compact 35-by-35-inch footprint. It is molded in Natural White, and the 1.9 specific gravity rating is one of the most useful numbers on this listing - it tells you how heavy a liquid the tank wall is built to hold. For water storage that rating gives you substantial headroom, since water carries a specific gravity of 1.0.
At a glance: 300 gallon capacity / 78"H / 35" x 35" footprint / Natural White / Polyethylene / 1.9 SG rating.
Will it work for your water storage?
This is a vertical storage tank sized for sites where floor space is tight but vertical clearance is available - a true 300 gallon tank in a 35-inch square footprint. Filled with water, expect about 2,502 pounds of contents, so plan the slab and supports around a loaded weight in that range. The tank wall itself is rated to carry contents up to 4,754 pounds, which is where the 1.9 specific gravity headroom comes from. In practice that headroom means this HD tank tolerates heavier-than-water source water - mineral-laden or chloride-dosed supplies that run denser than plain water - and gives a long-life margin even on a straight potable-grade water install. If you are unsure whether 300 gallons matches your draw-down and refill cycle, run the numbers with our Tank Sizing Calculator and read the Tank Sizing Guide before you commit to a size. People shopping this tank typically search for a Norwesco 300 gallon vertical storage tank, and that is exactly what this is.
Set it up right - the mistake to avoid
The most common mistake with a tall, narrow vertical tank like this one is the foundation. At 78 inches tall and 2,502 pounds full of water, this tank needs a flat, fully supported, level pad under the entire base - not gravel, not partial bearing. A vertical tank that sits on an uneven surface concentrates stress and can fail at the base. Pour or verify the pad first; our guide on Concrete Pad Sizing for Above-Ground Polyethylene Tanks walks through the ACI framework for getting the slab right. One more thing to verify before you order: fitting and outlet sizes are not published on this listing - confirm the configuration against the technical drawing on this page, or call 866-418-1777, before you plumb anything in.
Common uses
This size and shape works well as a rural or remote water reservoir, a backup supply, or part of a captured-water system. If you are storing water for fire protection, the design discipline in our Fire-Water Reservoir Tank Design guide covers NFPA 22 sizing and freeze protection for cold-climate sites. For rainwater harvesting, our first-flush diverter sizing guide follows the Texas Manual on Rainwater Harvesting, and for greywater or HVAC condensate capture our Industrial Water Reuse Tank Topology guide maps out how to band storage by quality.
This tank ships LTL freight from the nearest of two stocking locations - Mississippi or Texas (the Fairfield, TX plant) - with the cost quoted live to your ZIP code, so a Southeast buyer may rate cheaper from the Mississippi point. Get your number from the Freight Cost Estimator or call us at 866-418-1777 and we will quote it for you. Questions about fittings, the technical drawing, or matching this 300 gallon vertical storage tank to your application? We are here to help before you order.
