The Norwesco 4000 Gallon Black Vertical Storage Tank (SKU 40851) is a 4,000-gallon polyethylene vertical tank for bulk water and liquid storage where you need real volume on a stable above-ground footprint. It stands 125 inches tall on a 102 x 102 inch base, and its black exterior blocks sunlight to slow algae growth in stored water. This is a serious tank for ranch and agricultural water supply, fire-water reserve, rainwater collection, and industrial process water, and it is the Norwesco vertical storage tank buyers search for by name in black.
Will it work for your site?
The full picture starts with weight. Filled with water this tank carries 33,360 pounds of contents, and at its rated capacity it is engineered to hold up to 50,040 pounds. That number sets your foundation: a flat, fully supported, level pad sized to the 102 x 102 inch footprint with no overhang. A tank this size belongs on engineered concrete, not bare soil or partial blocking. Before you pour, walk through our concrete pad sizing guide so the slab is matched to that 50,040 lb loaded rating.
Why the 1.5 specific gravity rating matters
This tank is rated to a specific gravity of 1.5, meaning the wall is built to hold liquids weighing up to one and a half times the weight of water. Many vertical water tanks stop at a lighter rating, so the 1.5 wall gives you headroom to store heavier liquids such as brines and some fertilizer solutions, not just water. Treat 1.5 as the ceiling: confirm your fluid's specific gravity stays at or below it before switching this tank off water service. If you move to a heavier-than-water liquid, any fitting and gasket you select must also be rated for that fluid and weight — the tank wall rating is the limit on the tank, not on the plumbing you add.
Sizing it into your system
If you are still deciding whether 4,000 gallons is the right number, run your demand through our Tank Sizing Calculator and read the Tank Sizing Guide to match storage volume to your draw rate and refill cycle. For private fire protection on rural and remote sites, our fire-water reservoir design guide covers NFPA 22 reserve sizing and cold-climate freeze protection. If you are collecting rainwater, our rainwater harvesting guide covers first-flush diverter sizing, and for grey-water, rainwater, or HVAC condensate aggregation our industrial water reuse topology guide walks through quality-banded storage trains.
The mistake to avoid
The most common error on a tank this large is underbuilding the base. At more than 33,000 pounds full, an unlevel or undersized pad lets the tank settle and stress the wall — get the foundation right before water ever goes in. One more practical note: specific fitting and outlet sizes are not published in this listing, so confirm the bulkhead, outlet, and lid configuration you need by phone at 866-418-1777 before you order and plumb the tank.
This tank ships LTL freight from the Norwesco plant in Owego, NY, with freight quoted live to your ZIP code. Because it ships from a single Northeast origin, your exact cost depends heavily on distance — get your real number with our Freight Cost Estimator, or call 866-418-1777 and we will quote it for you and help confirm the tank and foundation are right for your project.
