The Norwesco 1000 Gallon Two Compartment Septic Tank is an IAPMO-certified polyethylene tank built for residential and light-commercial onsite wastewater systems where a two-compartment design is required by code. It holds 1,000 gallons total, measures 102 inches long by 60 inches wide by 63 inches high, and is molded in yellow polyethylene. The two-compartment layout is what most modern septic codes ask for ahead of the drainfield. This is the IAPMO-listed version of Norwesco's 1000 gallon septic tank, which is the listing most U.S. plumbing inspectors look for.
Will it work for your system?
Check your permitted tank size and your local two-compartment requirement first. Its 102 x 60 footprint and 63-inch height set your excavation size and burial depth, so confirm those against your site plan and your inlet and outlet invert elevations before you dig. Full of water the tank weighs about 8,340 pounds, so the hole, bedding, and backfill all need to support a fully loaded tank. The technical drawing on this page is the source of truth for the compartment partition, inlet and outlet locations, and any grommet or gasket sizing, since no separate fitting schedule is published for this listing - read it off the drawing or call us to confirm before you order seals. If you are weighing this against a single-compartment unit, our guide on single compartment vs two compartment septic tanks walks through where each is appropriate. For capacity planning, the Tank Sizing Calculator and Tank Sizing Guide help you match tank volume to household or facility load.
Certification and cross-border use
The IAPMO certification matters in jurisdictions that require a third-party-listed septic tank, and it is the listing most U.S. inspectors recognize. If you are installing in Canada or near the border, the approval scope differs, and our breakdown of Norwesco IAPMO and CSA B66 septic tank approvals explains how IAPMO and CSA B66 listings map to U.S. versus Canadian code. Always verify the specific listing your inspector requires for your installation.
The mistake to avoid
The most common error on a tank this size is underestimating access and placement. At 102 inches long, 60 inches wide, and 63 inches high, this is a large unit that needs real clearance and equipment to set - not something to thread through a tight gate or restricted opening. Work out your delivery path and excavation access before the truck arrives. Just as important, do not assume a baffle or compartment split that the drawing does not show: confirm the partition and invert heights on the technical drawing so your inlet and outlet line up with the field plumbing.
This tank ships LTL freight from the Norwesco plant in Hanford, CA - the only plant listed for this SKU - with cost quoted live to your ZIP code. Because it leaves a single California origin, buyers in the East and Midwest should pull a live quote before committing. Get your freight estimate with our Freight Cost Estimator, or call 866-418-1777 and we will quote the freight and confirm the right IAPMO-listed septic tank for your job.
