Norwesco 1500 Gallon Plastic Multi-Use Underground Liquid Storage Tank - IAPMO Certified

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 hauled or rainwater storage worth the hole. 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. As a cistern it stores rainwater or hauled water for a house, irrigation, stock or a fire reserve; 1500 gallons of water weighs 12510 lb, so the bedding and backfill carry that load when it is full. For a fire reserve, our guide to fire water reservoir design for rural and remote sites covers sizing and the part a buried polyethylene tank plays. If the water is for drinking, tell us before you order and we will confirm the right tank for that. Take Norwesco's IAPMO listing, the state approval and the drawing to the permit desk before the hole is dug; the inspector decides burial depth, setbacks and whether a riser is needed, and all three affect what you order.

Openings, fittings and risers

1. 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.
2. Manway. A 20 inch gasketed manway with a 20 inch lid. Below grade the gasket keeps groundwater out and gas in.
3. 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 top of the tank to finished grade before you order so the lids land at the surface and the tank can be pumped without digging.
4. 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 and setting the pipe grades.

The same shell for other states, and the size below

Norwesco builds this 1500 gallon tank at other plants under other part numbers with other state approvals: the 1500 gallon multi-use tank 41771 and the 1500 gallon multi-use tank 41772. 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 Norwesco's Hanford, California plant, 135 by 55 by 70 inches on the truck at 587 lb. The listed price is before freight; the freight cost estimator gives the lane cost to your ZIP; for Hawaii, call us and we will quote the ocean leg. Have the hole ready or a flat place to stage it, and a machine to lift it; 587 lb is not a two person carry. At the tailgate, check 41822 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.