A 1250 gallon two compartment septic tank for installations in Canada
The Norwesco 1250 gallon two compartment septic tank, part number 41746, is a yellow polyethylene tank 116 inches long, 55 inches wide and 70 inches tall, weighing 387 lb empty. Two compartments means a wall inside the tank divides it into a settling chamber and a clarifying chamber. It has a 4 inch inlet, a 4 inch outlet and a 20 inch manway. Norwesco lists the tank as IAPMO approved, lists its septic approval as Canada, and rates it to 130 F. It is built at Norwesco's plants in Lancaster, Ohio; Owego, New York; and Washougal, Washington, which puts a plant within reach of the eastern and western border crossings.
Installing north of the border? Call 866-418-1777 with the province and the permit requirements, get freight to your ZIP and add it to your cart above, or request a written quote.
Why two compartments, and what the Canada listing means
In a single chamber tank, solids settle and scum floats in the same space the outlet draws from, and a surge from a washing machine can push solids toward the drainfield. A two compartment tank takes the raw flow in the first chamber, lets most of the solids drop there, and passes calmer water into the second chamber before it reaches the outlet. The drainfield lasts longer for it. Our comparison of single compartment and two compartment septic tanks covers when a code requires the second chamber and when it is simply the better choice. On approvals, Norwesco lists this part number for Canada rather than for a list of US states, so it is the one to order for a Canadian installation; our note on Norwesco IAPMO and CSA B66 septic tank approvals and the Canadian cross-border scope explains how the IAPMO listing and the Canadian standard relate and what a provincial inspector will ask for. For a US installation, ask us for the version of this tank approved in your state.
Openings and fittings
- Inlet and outlet. 4 inch at each end, for 4 inch drain pipe. Tell us whether your installation needs the tee assemblies and gaskets supplied with the tank; Norwesco sells this shell in versions with them and versions without, and we will confirm what ships with this part number before the order goes in.
- Manway. A 20 inch manway with a 20 inch lid. Ask us about risers if the tank will sit deep enough that the lid needs bringing up to grade.
- Drawing. Norwesco's drawing for this tank, linked under Technical Drawing on this page, shows the baffle wall position, the invert heights of the inlet and outlet and the manway layout. Hand it to the installer with the permit.
The sizes either side, all listed for Canada
Norwesco's other Canadian two compartment tanks are the 1000 gallon two compartment septic tank with two manholes one size down, the 1250 gallon two compartment septic tank with two manholes at the same capacity with a manhole over each chamber, and the 1500 gallon two compartment septic tank with two manholes one size up. 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 Lancaster, Ohio; Owego, New York; or Washougal, Washington, 116 by 55 by 70 inches on the truck at 387 lb. The listed price is before freight; the freight cost estimator gives the lane cost to your ZIP, and for a delivery across the border call us first so the paperwork is right. At the tailgate, check 41746 on the bill of lading against the moulded number and walk the shell for transit cracks before you sign. Set it on the bedding Norwesco's installation instructions call for, fill both compartments with water as you backfill so the walls and the baffle stay in shape; 1250 gallons of water weighs 10425 lb, and that water is what holds the tank round while the backfill goes in. Keep vehicles off the ground above it.
Questions before you order? Call 866-418-1777.
Freight and documents
Ships from: St. Bonifacius, MN; Owego, NY; Lancaster, OH; 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 41746.
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 1250 Gallon Plastic Two 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.
