Norwesco 1000 Gallon Plastic Multi-Use Underground Liquid Storage Tank

Three jobs, one tank

As a septic tank, 1000 gallons is the size many health departments set as the minimum for a three bedroom house; your permit decides, and they approve tanks by model, so send them the number 41734 and Norwesco's drawing, linked on this page under Technical Drawing, before you order. As a pump tank or a holding tank it sits downstream of a septic tank or stands alone where there is no drain field. As a cistern it stores rainwater or hauled water out of the sun and out of the way, for irrigation, stock or a fire reserve; our guide to fire water reserves for rural and remote sites covers how a buried tank fits into that. For drinking water, ask us about the right tank before you order; this one is sold as a multi-use tank.

What to check before you buy

1. The hole. 102 by 60 inches at the tank, plus working room, 63 inches of tank plus bedding below and cover above. Measure the gravity line from the house to the inlet before the excavator arrives.
2. The pipe. The inlet and outlet are 4 inch adapters with PVC tee assemblies. Your 4 inch pipe joins them on site. For a cistern, the tees come out and the openings take your fill and draw lines.
3. Access at grade. The 20 inch gasketed manway is the pumping and inspection opening. Norwesco makes risers and extensions for it, one per manhole on this tank: a 6 inch extension N-63514, a 15 inch extension N-62397, a 24 inch extension N-62396, a 25 inch riser with a 12 inch lid N-62395, and a 36 inch riser with a 6 inch lid N-63830. Tell us the burial depth and we will put the right one on the order.
4. Traffic. A polyethylene underground tank goes under lawn, not under a driveway. If anything heavier than a mower will cross it, say so before you order.
5. Water table. An empty buried tank floats. If the site is wet, talk to us and your installer about the backfill and anchoring plan before the hole is dug.

Setting it

Follow Norwesco's installation instructions that ship with the tank. The usual sequence is a level bed of sand or fine gravel, the tank set and checked level across both diagonals, the pipe connected, then water added to the tank as the backfill goes in around it, in lifts, so the ribbed walls are loaded evenly from both sides. Keep sharp rock out of the backfill. Fill with clean water to the outlet before the system goes into service.

Sizes nearby

The same shell in its other builds: the 1000 gallon multi-use underground tank, second version, the 1000 gallon multi-use underground tank in its IAPMO approved build, and the 1000 gallon multi-use underground tank with gaskets, tees and two manhole covers. One size up: the 1250 gallon multi-use underground tank.

Shipping and receiving

The tank ships LTL from the nearest of Norwesco's plants, 102 by 60 by 63 inches and 383 lb on the pallet. The listed price is before freight; the freight cost estimator gives the lane cost to your ZIP. Risers ordered with the tank travel with it. At the tailgate, check the part number against 41734 on the bill of lading, look inside for both tee assemblies and the manway gasket, and walk round the shell for transit damage before the driver leaves.

Questions before you order? Call 866-418-1777.