The Norwesco 165 Gallon Dark Green Vertical Water Storage Tank is a polyethylene vertical water tank built for above-ground storage on a compact footprint that fits within 31 x 31 in. (roughly a 31-inch diameter). At 56 inches tall, it holds 165 gallons in a profile narrow enough for tight equipment rooms, well houses, pump sheds, and corner installs where a wider tank won't go. The dark green color cuts light penetration to slow algae growth in outdoor service. This page covers what the tank does, how it ships, and the one sizing detail people most often get wrong.
Specifications and what it handles
This is a 165-gallon vertical water storage tank rated to a 1.0 specific gravity, which means it is engineered for water and water-weight contents. Filled to capacity, the water alone weighs 1,376 pounds, and that 1,376-pound figure is also the maximum rated contents weight for the tank. Because the rating is 1.0 specific gravity, this tank is meant for fresh water and similar water-density liquids, not heavier chemical solutions. If your application involves a fluid denser than water, you need a tank rated above 1.0 specific gravity instead. For the molded dimensions, see the technical drawing on this page. Fitting and outlet configuration is confirmed at order, so call 866-418-1777 with your plumbing requirements before you finalize, and select bulkhead fittings and gaskets to suit your water service and operating temperature.
Sizing, siting, and the pad it sits on
A full tank concentrates 1,376 pounds onto a 31.0 x 31.0 footprint, so the surface underneath has to carry that load without settling. For above-ground installs, set this tank on a level, fully supporting pad. Our concrete pad sizing guide walks through the ACI 360R-10 framework for getting that base right. To confirm 165 gallons is the correct capacity for your draw and refill cycle, run the numbers with our Tank Sizing Calculator and the Tank Sizing Guide. After install, a controlled water-fill acceptance test catches pad settlement and fitting leaks before the tank goes into service; our hydrostatic test methodology guide covers the fill discipline and hold-time math.
Common applications
As a vertical storage tank, this size works well for rural fire-water reserve, rainwater and grey-water reuse buffering, and well or pump-fed water storage. If you are building a private fire-protection reserve, our fire-water reservoir design guide covers NFPA 22 sizing and cold-climate freeze protection. For reuse trains that aggregate grey water, rainwater, or HVAC condensate, the industrial water reuse topology guide shows how a tank this size fits a quality-banded storage train.
The mistake to avoid
The most common error on a tank this size is mismatching the contents to the specific gravity rating. This Norwesco vertical water storage tank is rated for 1.0 specific gravity, so it is built for fresh water. If you later decide to store something heavier than water, do not assume a water tank covers it; spec a tank rated for that liquid's density. Confirm your contents are water-weight before ordering.
This tank ships LTL freight, quoted live to your ZIP from the nearest Norwesco plant among Fairfield, TX; Griffin, GA; Owego, NY; Shawnee, OK; Tooele, UT; and Washougal, WA. Get an exact freight number with our Freight Cost Estimator, or call 866-418-1777 and we'll quote it for you. The listed price is the tank only; LTL freight is quoted separately to your delivery ZIP.
