A 1500 gallon two compartment septic tank for a new system or a replacement
The Norwesco 1500 gallon two compartment septic tank, part number 41760, is a yellow polyethylene septic tank 135 inches long, 55 inches wide and 70 inches tall, weighing 492 lb empty. It is the standard profile 1500 gallon tank: deeper and shorter than the low profile version, so it suits a site where the sewer line leaves the house with depth to spare and the excavation can go down rather than along. Two compartments hold back solids better than one: the first takes the heavy settling and the second polishes the liquid before it goes to the drainfield, which is why many codes now ask for two on new construction. It comes with a 4 inch adapter and PVC tee assembly at the inlet and another at the outlet, and a 20 inch gasketed manway. Norwesco lists the tank as IAPMO approved and backs it with a 3 year warranty; the service limit is 130 F.
Does your county accept it? Call 866-418-1777 with the county and the permit requirement, or get freight to your ZIP and add it to your cart above.
Where it goes and who signs off
A septic tank is a permitted installation everywhere in the country, and the permit is issued locally against a state list of approved tanks. Norwesco lists this tank with state septic approval in Alabama, Alaska, Arizona, California, Colorado, Connecticut, Delaware, the District of Columbia, Georgia, Maine, Maryland, Nevada, New Hampshire, New Mexico, New York, Oklahoma, Pennsylvania, Rhode Island, Tennessee, Texas, Vermont, Virginia and West Virginia. If your site is in one of those, take the part number to the county health or environmental office before you order; if it is not, call us, because Norwesco builds this size under other part numbers with approvals elsewhere and we will point you to the right one. Our guide to Norwesco IAPMO and CSA B66 septic tank approvals explains what the IAPMO listing covers and what it does not, and single compartment versus two compartment septic tanks covers why two is now the usual answer.
What to check before you buy
- The hole. 135 inches long and 55 inches wide, plus room around it for bedding and compaction. The 70 inch height plus the cover your code requires sets the depth, and that depth has to work with the elevation of the sewer line leaving the house: the inlet sits below the line with fall to spare.
- Inlet and outlet. Both are 4 inch adapter and PVC tee assemblies. The tee at the inlet drops incoming flow below the scum layer; the tee at the outlet draws from the clear zone of the second compartment. Your 4 inch sewer pipe connects to each adapter.
- Access. One 20 inch gasketed manway. Most codes require access at grade for pumping, so plan on a riser and lid to bring the opening to the surface; tell us the burial depth and we will quote the riser with the tank. Ask your inspector whether they want access over each compartment; if so, the version of this shell with two manhole covers is linked below.
- Groundwater. An empty polyethylene tank in wet ground floats. Follow Norwesco's installation instructions on bedding, backfill and filling, and never leave the tank pumped empty when the water table is high.
Norwesco's drawing for this tank is linked on this page under Technical Drawing. It shows the inlet and outlet positions, the baffle wall, the manway location and the rib pattern.
This size in other versions
Two compartments with two manhole covers: the 1500 gallon two compartment septic tank with gaskets, tees and two manhole covers. One compartment with two manholes: the 1500 gallon one compartment septic tank with two manholes. Another 1500 gallon part number, with its own state approvals: the 1500 gallon septic tank, part number 41761. One size down: the 1250 gallon one compartment septic tank. Match the part number to your permit, not the gallons.
Shipping and receiving
The tank ships LTL from the nearest of Norwesco's plants, 135 by 55 by 70 inches and 492 lb, on a flatbed or a trailer with the length for it. The listed price is before freight; the freight cost estimator gives the lane cost to your ZIP. Have a machine on site to lift it off. Before the truck leaves, check the part number against 41760 on the bill of lading, look the tank over for gouges or a cracked rib, and check that both tee assemblies and the manway gasket are present.
Questions before you order? Call 866-418-1777 with the county and the sewer line depth.
Freight and documents
Ships from: Griffin, GA; St. Bonifacius, MN; Owego, NY; Lancaster, OH; Shawnee, OK; Tooele, UT; Washougal, WA. LTL freight is quoted to your ZIP with the freight cost estimator or by phone at 866-418-1777. The listed price is before freight.
Technical drawing (PDF) for Norwesco 41760.
See this tank
Product video. Watch the Norwesco 1500 Gallon Plastic Two Compartment Septic Tank - IAPMO Certified video (69 seconds) with dimensions, fittings and shipping notes.
Ready to order?
Add it to your cart at the top of this page, get LTL freight to your ZIP, request a written quote, or call 866-418-1777. The listed price is before freight.
