The Norwesco 1500 Gallon Two Compartment Septic Tank is a low-profile, IAPMO-certified polyethylene tank built for residential and light-commercial septic systems where burial depth and clearance matter. At 51 inches tall with a 69 x 157 inch footprint, it sits lower in the ground than a standard high-profile tank, which keeps inlet and outlet inverts shallow and reduces excavation. The two-compartment design separates primary settling from clarified flow inside a single green poly shell, and because the plumbing ships loose, your installer configures the inlet, outlet, vent, and transfer porting to match the system layout on site.
Will it work for your system
This tank holds 1500 gallons nominal and carries an IAPMO certification, the listing many jurisdictions look for when approving a poly septic tank. Confirm your local plumbing code and inspector accept the IAPMO listing before you dig, since acceptance still depends on your authority having jurisdiction. The full water weight is roughly 12,510 pounds, so plan your set with equipment rated for that load and verify the excavation supports the 69.0 x 157.0 inch footprint. Note that 1500 gallons is the nominal tank rating; effective septic working volume depends on the inlet and outlet invert elevations shown on the technical drawing. Our Tank Plumbing System Design walkthrough covers how to lay out those tie-ins cleanly, and the single vs two compartment comparison explains why a two-compartment tank improves effluent clarity.
Plumbing the tank and reading the drawing
Because the plumbing arrives loose, the kit contents and the inlet, outlet, and transfer port locations are shown on the technical drawing on this page. Set the transfer port elevation per the drawing so primary settling and clarified flow stay properly separated, and confirm grommet and gasket sizes against the drawing before you source pipe. Check the invert locations and riser positions there too before ordering fittings or finalizing the dig, rather than measuring against a tank you have installed before.
How it ships
This tank ships LTL freight from the Norwesco plant in Griffin, Georgia. Freight is quoted live to your ZIP code rather than included in the listed price, since LTL cost depends on distance, accessibility, and any liftgate or residential delivery needs. Use the Freight Cost Estimator to get an LTL freight quote to your ZIP before you buy, or call 866-418-1777 and we will quote it for you.
The mistake to avoid
The most common error with a low-profile septic tank is treating it like a high-profile model when planning the dig. The low profile means a shorter, wider, longer footprint, so the hole geometry and the inverts are different, and the loose plumbing must be set to those shallower elevations. Measure against the technical drawing, not against a tank you have installed before. The second mistake is skipping IAPMO verification with your local authority; the certification is real, but acceptance still depends on your jurisdiction. Read the Norwesco IAPMO and CSA B66 approvals guide and the low-profile series field guide before specifying.
Not sure this is the right capacity for your household or flow? Run the numbers in our Tank Sizing Calculator or read the Tank Sizing Guide. When you are ready, get your LTL freight number from Griffin, GA with the Freight Cost Estimator or call 866-418-1777 for a quote to your ZIP.
