The Norwesco 100 Gallon Plastic Water Storage Tank (SKU N-41464) is a tall, narrow vertical tank built for water storage where floor space is tight. At 63 inches tall on a 23 x 23 inch footprint, it holds 100 gallons in a black polyethylene body. The opaque dark wall limits light penetration, which helps discourage algae growth, making it a practical pick for rainwater collection, fire-water reserve, and general bulk water jobs. If you searched "100 gallon water storage tank" or "vertical storage tank" and want a compact column rather than a sprawling footprint, this is the geometry that fits a corner or a pump-house wall on a literal 23 x 23 inch base.
Will it work for your install?
This is a vertical water tank with a 1.1 specific gravity rating, meaning the wall is engineered for liquids up to 1.1 times the weight of water, which is the correct, standard spec for water service. Filled with 100 gallons of water, the tank carries roughly 834 pounds of water weight; the wall is rated to a maximum contents weight of 917 pounds at the 1.1 SG ceiling. Plan your pad and any elevated stand around the rated max, not the empty shell. The fittings shown on the technical drawing on this page include a 2-inch standard bulkhead fitting, a 1-1/2-inch standard bulkhead fitting, and an 8-inch vented manway up top. The larger 2-inch port is the natural gravity-feed or drain outlet, while the 1-1/2-inch bulkhead suits a pump suction, return, or overflow line, so you can lay out inlet versus outlet before you trench. Each bulkhead seals with its supplied gasket hand-tightened against the tank wall; do not over-torque poly, and for water service a standard EPDM or Buna gasket seals fine. Confirm the bulkhead heights and orientations against the drawing first, since the narrow 23-inch footprint leaves little room to relocate a fitting after the fact.
The manway and venting
The 8-inch manway is large enough to reach in and inspect, clean, or fit a screen or strainer for rainwater capture, and because it is vented it lets air in and out as the level changes. That venting prevents the vacuum collapse that closed-top tanks can suffer on a fast draw-down, so a downstream pump pulling hard will not pull the wall inward. For permanent above-ground work, our guide to concrete pad sizing for above-ground polyethylene tanks walks the ACI 360R-10 framework, and after install our hydrostatic test methodology covers the water-fill acceptance and fitting-leak check that catch problems before service.
Sizing and the right application
Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm 100 gallons matches your draw-down and refill cycle before you buy. If this is going into a private fire-protection stack, our fire-water reservoir tank design guide works the NFPA 22 sizing discipline and freeze protection; if you are aggregating rainwater, grey-water, or HVAC condensate, our industrial water reuse tank topology guide maps the quality-banded storage train.
The mistake to avoid
The most common error on a narrow vertical like this is treating the 1.1 specific gravity rating as a license for any liquid. It is not. That rating is a structural margin, not a chemical-compatibility statement. For water storage you are well inside the envelope. If your plan involves anything heavier or chemically active, that is a different tank with a higher specific-gravity rating (1.5 or 1.9 SG class) and a different conversation, so call 866-418-1777 and we will spec the right tank for the liquid. The second mistake is underbuilding the base: a full 100-gallon column concentrates up to its 917-pound rated max on a 23-inch square, and a soft or out-of-level pad will rock or stress the wall over time.
This tank ships LTL freight from the Norwesco plant in Burnet, TX, with the rate quoted live to your ZIP. Get your number on the Freight Cost Estimator or call 866-418-1777 and we will work the freight with you. Listed before freight, with the LTL quote handled separately so you see the real landed picture before you commit.
3 Year Warranty
