The Norwesco 1500 Gallon Two Compartment Septic Tank is a low-profile polyethylene tank built for sites where burial depth is tight. At 51 inches tall on a 69 x 157-inch footprint, the invert and lid sit closer to grade than a taller-bodied tank of similar volume, which is the reason to choose this body when a high water table, shallow bedrock, or a gravity line that has to stay close to grade drives the design. The two-compartment design handles primary settling and clarification in one molded green poly body, and it ships ready to set with a 20-inch lid and outlet accounted for in the technical drawing on this page.
Does it work for your install?
This is a 1500-gallon two-compartment septic tank, so before you order, confirm your local health department and plumbing code recognize a single-tank two-compartment configuration for your design flow. Two-compartment tanks improve effluent quality by giving solids a second chance to settle before the outlet, which is why many jurisdictions favor them ahead of a drain field or advanced treatment unit. The technical drawing on this page shows a 20-inch service lid and the outlet; confirm inlet location, second-compartment access, and any additional risers against the drawing and your approved septic plan before you order. Because septic acceptance is code-driven and varies by state and county, confirm acceptance with your local permit authority first. Our guide on single compartment vs two compartment septic tanks walks through where the second compartment earns its keep, and the Norwesco IAPMO and CSA B66 approval scope guide is the right read if you are near the Canadian border or comparing US plumbing-code acceptance. This tank is rated for septic and wastewater service; effluent is near water density, so a chemical specific-gravity rating does not apply here.
Weight, sizing, and setting it
Full of water it carries roughly 12,510 lbs, so the excavation, bedding, and backfill matter. Plan the hole and bedding for the 69 x 157-inch footprint and follow Norwesco's burial and backfill instructions for low-profile tanks, including water-ballasting during backfill so the tank holds its shape. Run your numbers through the Tank Sizing Calculator and the Tank Sizing Guide if you are confirming capacity against household size or daily flow. For crews running these in service routes, the Norwesco low-profile series field operations guide covers handling and procurement. Outlet and lid sealing hardware should be matched to the connection on your approved plan, so call 866-418-1777 to confirm gasket, grommet, and riser fitment before ordering.
Freight and ordering
This is a freight-dominated tank at roughly 12,510 lbs full and a 69 x 157-inch footprint, so the lane distance drives the cost. Norwesco molds this low-profile septic tank in Shawnee, OK and Washougal, WA, and we ship from the plant nearest you, which shortens the haul for most of the country whether you are east or west. It ships LTL freight, quoted live to your ZIP. Get a number before you order with the Freight Cost Estimator, or call 866-418-1777 and we will quote it and confirm lid, outlet, and burial questions against your septic plan.
