A 1000 gallon single compartment septic tank in yellow
The Norwesco 1000 gallon one compartment septic tank, part number 41718, is a yellow polyethylene tank 102 inches long, 60 inches wide and 63 inches tall, weighing 318 lb empty. It is the standard depth shell, so it suits a site where the sewer line from the house leaves at normal depth and the dig is straightforward. The whole 1000 gallons works as one settling chamber. It ships with 4 inch adapters and PVC tee assemblies for the inlet and the outlet, and access is through a 20 inch gasketed manway. Norwesco lists the tank as IAPMO approved, backs it with a 3 year warranty, and sets the service limit at 130 F. Norwesco lists state septic approvals for this model in Minnesota, Ohio, Oklahoma and Utah.
Does your county accept this tank? Call 866-418-1777 with the county and we will check before you order, or get freight to your ZIP and add it to your cart above.
Who buys a single compartment tank
A single compartment tank is the simplest septic tank made and still the one many counties accept for a house of ordinary size on a new install or a replacement. Everything happens in one chamber: solids settle to the bottom, scum floats to the top, and the outlet tee draws the clear liquid from between them to the drainfield. Where the county requires two compartments, the 1000 gallon two compartment tank is the same shell with a baffle; our note on single compartment versus two compartment septic tanks explains the difference. Before you order, confirm with your local health department that a single compartment 1000 gallon polyethylene tank is accepted for your bedroom count. Norwesco's listed state approvals for this exact model are above; if your state is not on the list, ask us, because Norwesco makes versions of this tank for other states. Our note on Norwesco IAPMO and CSA septic tank approvals explains what the listings cover.
Openings and fittings
- Inlet. A 4 inch adapter with a PVC tee assembly. The inlet tee turns the incoming flow downward so it does not stir the scum layer. The inlet sits higher than the outlet, which keeps the tank flowing in one direction.
- Outlet. A 4 inch adapter with a PVC tee assembly. The outlet tee draws from below the scum and above the sludge. If your code calls for an effluent filter in the outlet tee, tell us and we will add one.
- Manway. A 20 inch gasketed manway for inspection and pumping. If the lid will finish below grade, ask us for the riser that brings it to the surface; a lid you can find without a shovel gets pumped on time.
- Drawing. Norwesco's drawing, linked under Technical Drawing on this page, gives the inlet and outlet invert heights you need to set the pipe grades from the house and to the drainfield.
Setting it
Follow Norwesco's installation instructions for this tank: they set the bedding, the backfill material and the order in which you fill the tank with water while backfilling so the walls are supported from both sides. Never backfill an empty polyethylene septic tank and never set one where vehicles will drive. Level the bedding on both axes before the tank goes in; an out-of-level tank puts the outlet invert in the wrong place relative to the inlet. Fit the tees, connect the pipes, fill with water to the outlet, and then call for the inspection. Yellow makes the tank easy to see in an open hole and easy to find again if the lid is ever lost under turf.
Sizes nearby
The same single compartment tank under another part number: the 1000 gallon one compartment septic tank, part number 44473, and the 1000 gallon septic tank, part number 41721. One size down: the 750 gallon one compartment septic tank. One size up: the 1250 gallon one compartment septic tank. Our sizing guide by application covers where each size fits.
Shipping and receiving
The tank ships LTL, 102 by 60 by 63 inches and 318 lb, from the nearest of Norwesco's Griffin, Georgia, Lancaster, Ohio, Owego, New York, Shawnee, Oklahoma, St. Bonifacius, Minnesota, Tooele, Utah or Washougal, Washington plants. The listed price is before freight; the freight cost estimator gives the lane cost to your ZIP. At the tailgate, check the part number against 41718 on the bill of lading, count the adapters, tees and the manway lid, and walk the shell for transit damage before the driver leaves.
Questions before you order? Call 866-418-1777.
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 41718.
See this tank
Product video. Watch the Norwesco 1000 Gallon Plastic One Compartment Septic Tank - IAPMO Certified video (71 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.
