The Norwesco 1000 gallon two-compartment septic tank carries IAPMO certification and is approved in Canada, which makes it one of the few molded poly septic tanks you can specify on either side of the border for a single primary-treatment install. The two-compartment design separates settling and clarification inside one yellow polyethylene shell, and the two molded manholes give you direct access to each chamber for pumping and inspection. It measures 102 inches long by 60 inches wide by 63 inches tall, so plan the excavation footprint at 60 x 102 inches before you dig.
Will it work for your install?
This is a 1000 gallon two-compartment tank molded in polyethylene by Norwesco. Filled to capacity with water it weighs 8,340 pounds, so the bedding and backfill have to support that mass evenly across the 60 x 102 inch base. The two-compartment layout separates settling and clarification into two chambers within the single shell, and on a 102-inch-long shell the two manholes sit over separate chambers along the length, so the inlet end and the outlet/clarification end are set by how you orient the tank in the trench. If you are weighing chambers against a simpler design, the guide on single compartment vs two compartment septic tanks walks through where each fits. For matching tank capacity to your application, run the numbers through the Tank Sizing Calculator and the Tank Sizing Guide before you commit.
Certification and cross-border approval
The IAPMO listing and the Canadian approval are what set this unit apart for installers working near or across the border. The certification scope matters: an IAPMO listing and a Canadian approval do not automatically mean the same thing as your local US plumbing code acceptance. Confirm the listing your inspector requires before ordering. Our writeup on Norwesco IAPMO and CSA B66 septic tank approvals breaks down where the IAPMO and CSA B66 scopes apply versus US codes, which is the detail that trips up most cross-border jobs.
The mistake to avoid
The most common error on a poly septic tank this size is improper bedding and burial. Filled to capacity the tank weighs 8,340 pounds, but the harder failure mode is the empty shell during installation: a poly septic tank relies on uniform backfill support and correct burial depth to handle ground pressure, and an empty tank in saturated soil can float or distort. Fill the tank with water as you backfill, set it on uniform bedding rather than uneven fill, and follow the manufacturer's burial spec rather than skipping it. Refer to the technical drawing on this page for the manhole locations and inlet/outlet details so your plumber can rough in the connections correctly. If you are also evaluating doorway-style tanks for tight-access sites, the Norwesco doorway tank sizing guide covers the 100 to 1000 gallon range by application.
At roughly 102 inches long and an 8,340-pound full-water rating, this is a genuine LTL freight item. It ships LTL, quoted live to your ZIP from the nearest Norwesco plant in Lancaster, OH; Owego, NY; St. Bonifacius, MN; or Washougal, WA. Get a freight quote with the Freight Cost Estimator, or call us at 866-418-1777 to confirm certification scope for your jurisdiction and schedule delivery.
