Norwesco 305 Gallon Dark Green Vertical Water Storage Tank

The Norwesco 305 gallon vertical water storage tank gives you a compact water reserve in a footprint that fits where space is tight. At 50 inches tall on a 46 by 46 inch base, this dark green polyethylene tank holds 305 gallons of water and is rated to a 1.0 specific gravity, meaning it is built for water and water-weight contents, not heavier-than-water liquids. The dark green resin cuts light penetration to slow algae growth in outdoor service, which makes it a practical pick for water storage, vertical storage tank duty, and general bulk water holding.

Will it work for your install?

This vertical water tank measures 50 inches high on a 46 by 46 inch footprint, so confirm your pad or stand clears those dimensions and that the area is fully supported. At 50 inches tall it stands upright through a standard 80-inch doorway, and the 46 by 46 base drops onto a standard 48 by 48 pad with margin to spare. Filled to capacity, plan for the load: 305 gallons of water weighs about 2,544 pounds, and 2,544 pounds is the maximum rated contents weight for this tank. That number drives everything underneath it. A poured slab, the soil bearing, and any elevated stand all need to carry the full water weight without settling. If you are matching tank size to a demand schedule, run your numbers through the Tank Sizing Calculator and the Tank Sizing Guide before you buy. For a flat, properly sized base under an above-ground poly tank, the framework in our concrete pad sizing guide (ACI 360R-10 framework) walks the bearing math.

What it is rated for, and 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 the wall thickness is engineered for water-weight contents. A liquid heavier than water, anything above 1.0 specific gravity, exceeds what this tank is rated to carry and is the wrong call here; that service needs a higher-SG-rated tank. If your contents are heavier than water, do not force this tank into the job. Call us at 866-418-1777 and we will spec the right tank for the liquid you are storing. Use this one for what it is designed for: irrigation, rainwater, and general bulk water storage. After install, fill and test before you rely on it. Our hydrostatic test methodology guide covers the water-fill discipline, pad-settlement monitoring, and fitting leak checks that catch problems on day one instead of month six. Lid and outlet configuration is confirmed on order, so call if you need a specific fitting arrangement before you commit.

Putting the water to work

A 305 gallon reserve sits in a useful range for rural and remote sites. If you are building a private fire-protection reserve, our guide on fire-water reservoir tank design (NFPA 22 sizing and freeze protection) covers how a poly tank fits the stack and how to keep it from freezing in cold-climate service. For grey-water, rainwater, and HVAC condensate capture, the water reuse tank topology guide shows how a tank this size fits a quality-banded storage train. The technical drawing on this page gives you the verified dimensions to plan around.

This tank ships LTL freight from the nearest of our Norwesco plants: Fairfield, TX; Griffin, GA; Lancaster, OH; Owego, NY; Shawnee, OK; Tooele, UT; or Washougal, WA, with freight quoted live to your ZIP. Get your exact number on the Freight Cost Estimator, or call 866-418-1777 and we will route it from the closest plant to keep your freight down.