A 2500 gallon low profile underground tank for septic or water storage
The Norwesco 2500 gallon multi-use underground liquid storage tank, part number 44079, is a white polyethylene tank 159 inches long, 99 inches wide and 51 inches tall, weighing 880 lb empty. Multi-use means Norwesco builds it for either job in the ground: a septic tank or a cistern for rainwater or well water. At 51 inches tall it goes into a shallow excavation, which is the reason to pick this shell over a taller one on rock or a high water table. It has a 20 inch manway cover and one manhole to bring up to grade. Norwesco rates it for liquids up to 1.9 specific gravity, the service limit is 130 F, and Norwesco backs it with a 3 year limited warranty. Norwesco's state septic approval list for this tank names every state except Hawaii, plus the District of Columbia. 2500 gallons of water weighs 20850 lb.
Septic permit or water store? Call 866-418-1777 with the state and the burial depth and we check the approval and put the riser on the same order, or get freight to your ZIP and add it to your cart above.
Where it goes
As a septic tank, 2500 gallons is a large house, a duplex or a small commercial building; the health department sets the size from bedrooms, fixtures and soil, so confirm the number with them before you buy. As a cistern, it is a serious rainwater or well water store, or a fire reserve for a rural property. Either way it is built to be buried: the installer beds it on compacted granular fill and backfills in lifts while filling the tank with water in step, so the long sides are supported as the soil load goes on, and keeps vehicles off the area unless the installation is designed for traffic. Norwesco's installation instructions for this tank are the authority on bedding, backfill and burial depth; your installer follows them, not this page. At 880 lb and 159 inches long it goes in with a machine. If it is a fire reserve, our guide to fire water reservoir tank design for rural and remote sites covers the sizing discipline and freeze protection.
Openings, fittings and risers
- Manway. A 20 inch manway cover on the single manhole: wide enough to pump out, inspect, and lower a pump and a float if the tank is holding water.
- Inlet and outlet. Norwesco's data for this tank lists no inlet or outlet fitting. For septic service that means the tees and their gaskets are added to suit your permit; for water service it means bulkhead fittings where your lines run. Tell us which job it is doing and we confirm what the tank ships with and what you add.
- Riser. Norwesco's riser and extension options for this tank are ordered one per manhole, and this tank has one: a 6 inch extension (N-63832), a 15 inch extension (N-63833), a 24 inch extension (N-63834), a 23 inch riser with a 12 inch lid (N-63831) or a 36 inch riser with a 6 inch lid (N-63830). Measure from the top of the tank to finished grade and tell us the number.
- Drawing. Norwesco's drawing for this tank, linked under Technical Drawing on this page, shows the manhole position and the flat areas of wall that take the fittings.
Septic or water, not both
Decide before it goes in the ground. A tank that has been a septic tank is a septic tank for good; a tank that starts as a cistern can hold drinking water. The approvals paperwork an inspector asks for is covered in our note on Norwesco septic tank documentation, north and south of the border. For a cistern, use the tank sizing calculator and tank sizing guide to check the volume against your roof area or your draw.
Sizes nearby
For water only, one step down is the 2000 gallon underground cistern. The next multi-use size up is the 2600 gallon multi-use underground tank. Call us if your permit calls for a size between them.
Shipping and receiving
The tank ships as oversize freight, 159 by 99 by 51 inches and 880 lb, from the nearest of Norwesco's Hanford, California, Shawnee, Oklahoma and St. Bonifacius, Minnesota plants. The listed price is before freight; the freight cost estimator gives the lane cost to your ZIP. Have a loader or a forklift ready; the driver will not unload it alone. At the tailgate, check the part number against 44079 on the bill of lading, look at the shell and the manhole rim for transit damage, and fill it with water once above ground before it goes in the hole so any problem shows while you can still reach it.
Questions before you order? Call 866-418-1777.
Freight and documents
Ships from: Hanford, CA; St. Bonifacius, MN; Shawnee, OK. LTL freight is quoted to your ZIP with the freight cost estimator or by phone at 866-418-1777. The listed price is before freight.
Technical drawing (PDF) for Norwesco 44079.
See this tank
Product video. Watch the Norwesco 2500 Gallon Multi-Use Underground Liquid Storage Tank video (67 seconds) with dimensions, fittings and shipping notes.
Ready to order?
Add it to your cart at the top of this page, get LTL freight to your ZIP, request a written quote, or call 866-418-1777. The listed price is before freight.
