A 1000 gallon low profile single compartment septic tank for Illinois
The Norwesco 1000 gallon one compartment septic tank, part number 43538, is a green polyethylene tank 127 inches long, 60 inches wide and 51 inches tall, weighing 352 lb empty. It is made at Norwesco's Lancaster, Ohio plant and Norwesco lists its state septic approval for Illinois, so this is the low profile single compartment tank to order for an Illinois install. Low profile means the tank is long and shallow, which keeps the excavation short where a high water table, a shallow sewer line or heavy clay makes a deep hole a problem. The whole 1000 gallons works as one settling chamber. Loose plumbing means the 4 inch gaskets with tee assemblies for the inlet and outlet ship with the tank for the installer to fit on site. Access is through a 20 inch gasketed manway. Norwesco lists the tank on IAPMO file 3114, backs it with a 5 year warranty, and sets the service limit at 130 F.
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.
Where a low profile tank earns its place
A standard septic tank needs a hole deep enough for the tank plus cover, and on a lot of Illinois ground that hole fills with water before the tank goes in. The low profile shell is 51 inches tall, so the dig stays shallow, the sewer line from the house can leave at a modest depth and still arrive above the inlet, and the whole system can sit higher where the drainfield is near the surface. A single compartment tank is the simplest design there is; confirm with your county health department that a single compartment 1000 gallon polyethylene tank is accepted for your bedroom count, and whether they require an effluent filter or a riser. Where two compartments are required, the 1000 gallon low profile two compartment tank is the same shell with a baffle. Our note on Norwesco IAPMO and CSA septic tank approvals explains what the listings cover, and the low profile tank field guide covers handling a long shallow tank on site.
Openings and fittings
- Inlet. A 4 inch gasket with a tee assembly, shipped loose. The inlet tee turns the incoming flow downward so the scum layer stays undisturbed. The inlet sits higher than the outlet, which keeps the tank flowing in one direction.
- Outlet. A 4 inch gasket with a tee assembly, shipped loose. The outlet tee draws from below the scum and above the sludge. If your code calls for an effluent filter here, tell us and we will add one to the order.
- 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.
- Drawing. Norwesco's drawing, linked under Technical Drawing on this page, gives the invert heights at the inlet and outlet you need to set the pipe grades. Our inlet, outlet and vent tie-in walkthrough covers the rest of the plumbing.
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; a long shallow tank shows an out-of-level set at the outlet invert faster than a short one. Fit the tees, connect the pipes, fill with water to the outlet, and then call for the inspection.
Related tanks
The same low profile single compartment design for other states: the 1000 gallon low profile one compartment tank, part number 42405, and the version with a side inlet. For Florida: the 900 gallon and 1050 gallon Florida two compartment tanks.
Shipping and receiving
The tank ships LTL, 127 by 60 by 51 inches, from Norwesco's Lancaster, Ohio plant. 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 43538 on the bill of lading, count both tee assemblies 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: Lancaster, OH. 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 43538.
See this tank
Product video. Watch the Norwesco 1000 Gallon Plastic One Compartment Septic Tank with Loose Plumbing and Low Profile Design - IAPMO Certified video (64 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, or call 866-418-1777. The listed price is before freight.
