The Norwesco 1250 Gallon Two Compartment Septic Tank puts a primary settling compartment and a second clarifying compartment inside a single low-profile polyethylene vessel, so you get two-stage separation without setting two tanks. Molded in green and IAPMO-certified, it ships with loose plumbing to tie inlet and outlet into your run, and its 51 in height keeps burial shallow where a high water table or rock makes a deeper dig impractical.
Will it work for your install?
This is a two-compartment septic tank rated at 1250 gallons, measuring 157 in long by 60 in wide by 51 in tall, with a 60.0 x 157.0 in footprint to lay out against your excavation. At 51 in tall it is a genuinely low-profile body for shallow burial, and the 157 in length is the long axis your dig and access lids must be laid out against. It is IAPMO-certified, the listing many jurisdictions require for a plastic septic tank, so confirm with your local health department or plumbing inspector that IAPMO satisfies your code before you order. For sizing the tank to your daily flow and bedroom count, work through the Tank Sizing Calculator and the Tank Sizing Guide, and if you are deciding between chambers, our guide on single compartment vs two compartment septic tanks compares the two designs.
Plumbing the loose-fit kit
The plumbing ships loose, so you set the inlet and outlet tie-ins to match your run. Specific inlet/outlet pipe sizes and any gasket or grommet details are not published on this listing, so verify them against the technical drawing on this page before you buy pipe, and call 866-418-1777 if you need the fitting detail confirmed before ordering. For laying out the inlet, outlet, vent, and overflow tie-ins, walk through Tank Plumbing System Design: Inlet, Outlet, Vent.
Installation and the mistake to avoid
Filled to capacity this tank carries about 10,425 lb of water weight, so the bedding, backfill, and compaction underneath and around it matter as much as the tank itself. The most common mistake on a low-profile plastic septic tank is treating it like a deep concrete tank: it must be set on a level, uniformly compacted base and backfilled evenly to avoid distortion. Verify the burial, backfill, and any load requirements in the technical drawing on this page before you excavate. If you are weighing this against deeper or different-profile bodies, the Norwesco Low-Profile series field guide covers handling and procurement for this family.
Certification and cross-border use
The IAPMO listing is the headline credential here. If your project crosses into Canada or you are comparing it against CSA requirements, read Norwesco IAPMO and CSA B66 Septic Tank Approvals to see how the IAPMO scope maps against US plumbing codes versus the Canadian CSA B66 path.
This is a large LTL-only vessel shipping from a single plant in Lancaster, OH, so transit distance to your ZIP drives the quote. Get a live freight number with the Freight Cost Estimator, or call 866-418-1777 to confirm IAPMO suitability for your jurisdiction and lock in delivery.
