A 1500 gallon underground tank for septic, pump or cistern duty, built at seven plants
The Norwesco 1500 gallon multi-use underground liquid storage tank, part number 41771, is a blue polyethylene tank 135 inches long, 55 inches wide and 70 inches tall, weighing 563 lb empty. Multi-use means the same shell works as a septic tank, a pump or holding tank, or a buried cistern. It comes with a 4 inch adapter and PVC tee assembly at the inlet and at the outlet and a 20 inch gasketed manway. Norwesco lists the tank as IAPMO approved, rates it to 130 F, backs it with a 3 year warranty, and lists state septic approval for Arkansas, Connecticut, Delaware, the District of Columbia, Indiana, Kentucky, Maine, Maryland, Michigan, Minnesota, Mississippi, Montana, Nebraska, New Hampshire, New York, North Dakota, Ohio, Rhode Island, South Carolina, South Dakota, Virginia, West Virginia and Wyoming. It is built at seven Norwesco plants, so the freight lane is usually a short one.
Is your state on the list? Call 866-418-1777 with the permit requirements, get freight to your ZIP and add it to your cart above, or request a written quote.
Septic, pump tank or cistern
At 1500 gallons this is the septic size for a larger house in most codes, and the cistern size that makes rainwater or hauled water storage worth the excavation. As a septic tank the house drain enters through the inlet tee, solids settle, and clarified effluent leaves through the outlet tee for the drainfield. As a pump or dosing tank it holds effluent between pump cycles for a mound or a pressure field. As a cistern it stores rainwater, hauled water or a fire reserve; 1500 gallons of water weighs 12510 lb, which is the load the bedding carries when it is full. For a fire reserve, our guide to fire water reservoir design for rural and remote sites covers sizing and freeze protection. If the water is for drinking, tell us before you order and we will confirm the right tank for that. On approvals, Norwesco's IAPMO listing and the state list above are what the health department will ask for; our note on Norwesco IAPMO and CSA B66 septic tank approvals explains what each listing covers. If your state is not on the list, call us; the same shell is sold under other part numbers with other approvals.
Openings, fittings and risers
- Inlet and outlet. A 4 inch adapter with a PVC tee assembly at each end, ready for 4 inch drain pipe. The inlet tee drops the flow below the scum layer; the outlet tee draws from below it. Both go in before the system is used.
- Manway. A 20 inch gasketed manway with a 20 inch lid. Below grade the gasket keeps groundwater out and gas in.
- Risers to grade. Norwesco's optional risers and extensions, two of each for the two manholes: the N-63514 6 inch extension, N-62397 15 inch extension, N-62396 24 inch extension, N-62395 25 inch riser with 12 inch lid and N-63830 36 inch riser with 6 inch lid. Measure from the tank top to finished grade before you order so the lids land at the surface.
- Drawing. Norwesco's drawing for this tank, linked under Technical Drawing on this page, gives the inlet and outlet invert heights and the manhole positions for laying out the excavation.
The same shell for other states, and the size below
Norwesco builds this 1500 gallon tank under other part numbers with other state approvals and plants: the 1500 gallon multi-use tank 41772 and the 1500 gallon multi-use tank 41822 built in California. One size down is the 1250 gallon multi-use underground tank. Where the code sizes the tank by bedrooms or daily flow, the tank sizing calculator and tank sizing guide get you to the right capacity before you call.
Shipping, receiving and setting
The tank ships LTL from the nearest of Norwesco's plants at Griffin, Georgia; Lancaster, Ohio; Owego, New York; Shawnee, Oklahoma; St. Bonifacius, Minnesota; Tooele, Utah; or Washougal, Washington, 135 by 55 by 70 inches on the truck at 563 lb. The listed price is before freight; the freight cost estimator gives the lane cost to your ZIP. Have a machine to lift it; 563 lb is not a two person carry. At the tailgate, check 41771 on the bill of lading against the moulded number, look at both tee assemblies and the manway gasket, and walk the shell for transit cracks before you sign. Set it on the bedding Norwesco's installation instructions call for, fill it with water as you backfill so the walls stay round, and keep vehicles off the ground above it.
Questions before you order? Call 866-418-1777 with the permit in hand.
Freight and documents
Ships from: Griffin, GA; St. Bonifacius, MN; Owego, NY; Lancaster, OH; Shawnee, OK; Tooele, UT; Washougal, WA. 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 41771.
See this tank
Interactive 3D model with live fill. This tank has an interactive 3D model built to its manufacturer dimensions. Rotate it, and set a fill level to see how much liquid it holds at any height. Open the 3D view on the product photo above. Download the 3D model (GLB).
Product video. Watch the Norwesco 1500 Gallon Plastic Multi-Use Underground Liquid Storage Tank - IAPMO Approved video (72 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.
