The Norwesco 10000 Gallon Multi-Use Underground Liquid Storage Tank (SKU N-45686) is a White polyethylene tank built to bury serious volume in a single excavation. It holds 10,000 gallons, with a footprint of 101 by 356 inches and a height of 107 inches. Listed tank type is septic, and the same body is sold for general underground liquid storage where a rural site, a private system, or a high-demand reservoir needs a large buried tank. If you are sizing an underground storage tank or an underground septic tank, this is the size that lets you put one big body in the ground instead of staging several smaller ones.
Will it work for your site?
This tank holds 10,000 gallons in a polyethylene shell. Plan your excavation around the full dimensions: 356 inches long, 101 inches wide, and 107 inches tall. The 356-inch run is the figure that catches people off guard, since at nearly 30 feet of body length it governs your hole, your equipment access, and where you can stage a crane during placement. Those dimensions drive your bedding and backfill as well, so confirm every one against the technical drawing on this page before you dig. Full of water, the tank and its contents weigh roughly 83,400 pounds, which is the number that matters for soil bearing, burial depth, anti-flotation, and the equipment you stage near an open hole.
One specification to note up front: this tank carries no specific-gravity rating in our data. That is fine for water and septic effluent, both near a specific gravity of 1.0, but it means this is not the tank to spec for a dense liquid. If your liquid is heavier than water, choose a tank with a published specific-gravity rating instead. Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm 10,000 gallons matches your draw and refill cycle before you commit to an excavation this size.
Septic approval, venting, and code
Because this is sold as a septic tank, confirm it is accepted by your local authority before you order. Approvals for Norwesco septic tanks vary by jurisdiction, and Canadian projects follow a different path than US plumbing codes; our guide on Norwesco IAPMO and CSA B66 septic tank approvals walks the cross-border scope so you can match the tank to your inspector. A buried tank this large also needs proper vent sizing so it can breathe during fill and draw; the worked examples in our API 2000 atmospheric vent-capacity guide cover thermal inbreathing, liquid-movement outbreathing, and combined sizing. If you are putting this tank to work as a rural fire-water reservoir, our NFPA 22 fire-water reservoir design guide covers the sizing discipline and cold-climate freeze protection. For the structural side of a load this heavy, the framework in our concrete pad sizing guide is useful background.
Fitting, gasket, and riser configuration is confirmed on the technical drawing on this page and by phone at 866-418-1777, since those details are not listed in the online spec for this tank.
The mistake to avoid
The most common error on a buried tank this large is treating the dry weight as the design number. The load that governs your site is the 83,400-pound full-water weight, plus the soil and traffic loads over a buried shell. Get your bedding, anti-flotation, and backfill specification right for that loaded condition, and confirm every dimension, including the 356-inch length, against the technical drawing before excavation. Ordering the wrong footprint on an underground storage tank is an expensive mistake to discover once the hole is already open.
This tank ships LTL freight from Norwesco's plant in St. Bonifacius, MN, quoted live to your ZIP. Get a delivery number with our Freight Cost Estimator, or call 866-418-1777 and we will help you size the underground storage tank to your site and line up freight. Listed before freight.
