The Norwesco 120 Gallon Dark Green Vertical Water Storage Tank is a polyethylene vertical tank that holds 120 gallons in a compact 38" x 38" footprint at just 31" tall - a low, wide stance that sits wider than it is tall, which gives it a steady base on a small slab and makes it a fit for tight pump houses, equipment sheds, trailer beds, and rural water-haul setups where floor space is limited but you still need real on-hand capacity. The dark green color cuts light penetration to slow algae growth in stored water. Whether you are building out a rural fire-water reserve, a rainwater or grey-water reuse train, or a simple water-haul rig, this size lands in the everyday-utility band of vertical water storage.
Will it work for your install?
This is a vertical water storage tank rated to a specific gravity of 1.0, which means it is built for water and water-weight liquids - it is not a higher-SG chemical tank, so keep contents at or near the density of water. Filled to capacity, 120 gallons of water weighs roughly 1,001 lb, which is also the maximum rated contents weight for this tank. Note that 1,001 lb is the in-service loaded weight for pad design, not the shipping weight - the tank ships empty, so the figure the LTL carrier moves is far lighter. Plan your pad and support for the loaded weight, though: a square 38" x 38" footprint concentrates a half-ton of water onto a small area, so a level, full-bearing surface is not optional.
Fittings and the drawing check
The tank carries a sump with a 4-segment base detail and a revised lid-thread design, both shown on the technical drawing on this page. Before you order any bulkhead, lid, or adapter, confirm thread pitch AND gasket/seal seating against the revised lid-thread callout and the 4-segment sump - a part that fit an older Norwesco run may not seat correctly here. Review that drawing so the lid and fitting layout match what your plumbing expects before you buy plumbing.
Pad, weight, and acceptance
For siting, our Concrete Pad Sizing for Above-Ground Polyethylene Tanks guide walks the ACI 360R-10 framework for putting a stable base under a loaded vertical tank, and once it is set, our Hydrostatic Test Methodology guide covers the water-fill acceptance check - watching pad settlement and fitting leaks over a measured hold. If you are weighing this 120-gallon size against your actual draw and refill cycle, run the numbers in our Tank Sizing Calculator or read the Tank Sizing Guide first. For larger reserve planning - rural fire protection or multi-source reuse - see our Fire-Water Reservoir Tank Design and Industrial Water Reuse Tank Topology guides.
The mistake to avoid
The common error on a vertical water storage tank this size is ordering fittings before reading the drawing. This tank ships with a revised lid-thread spec and a 4-segment sump detail, so match the thread and sump callouts on the technical drawing on this page before you buy plumbing. The second mistake is treating the 1.0 specific-gravity rating as flexible: this is a water tank, not a chemical tank, so do not put a denser liquid in it expecting the wall to carry the extra load.
This Norwesco vertical storage tank ships LTL freight, quoted live to your ZIP from whichever stocking plant is nearest you - Fairfield, TX; Griffin, GA; Owego, NY; or Shawnee, OK - which materially changes the number on a unit this size. Get an exact figure with our Freight Cost Estimator, or call 866-418-1777 and we will quote it for you. List price shown here is before freight.
