The IAPMO Approved Septic Tanks catalog at OneSource Plastics includes every active manufacturer SKU across Norwesco, Snyder Industries, Chem-Tainer, Enduraplas, and Bushman — rotomolded polyethylene tanks. Certifications such as ASTM D1998 construction and FDA 21 CFR 177.1520 food-contact resin compliance vary by model and manufacturer, so check each product's Specifications for what applies to that tank. Use the sort and filter controls below to narrow by capacity, brand, or dimensions.
Applications
Residential and small-commercial septic systems (single- and dual-compartment)
Low-profile installation under driveways or high water tables (10"-18" cover)
Holding-tank applications where municipal sewer is unavailable
Aerobic treatment systems (ATU) and pump chambers
Compliance & Standards
All polyethylene tanks in this category are rotomolded from FDA 21 CFR 177.1520 compliant resin and manufactured to ASTM D1998 specification for upright polyethylene storage. UV stabilizers are co-extruded into the resin for outdoor installation. Maximum operating temperature 120°F for HDPE; higher for XLPE (cross-linked polyethylene). NSF 61 certified models available on request for potable drinking water applications — call to specify.
Freight & Delivery
Tanks ship LTL motor freight from the closest stocking warehouse to your delivery ZIP. Typical transit 5-10 business days. Liftgate available at delivery (per-shipment fee). Always inspect at delivery and note any damage on the bill of lading before signing — that is the LTL carrier claim trigger. Bulk-order consolidation reduces per-tank freight 25-40%. Same-business-day quotes: call 866-418-1777 with MPN, quantity, and delivery ZIP.
Sizing & Selection
Pick capacity first, then verify dimensions against your installation footprint. Most rotomolded tanks are built to OEM standard dimensions ± standard rotational-molding tolerance of ±2-3%. Vertical tanks need flat-pad foundation; horizontal/leg tanks need stand or cradle (check listing — some are sold with integrated stand, others require separate stand or band purchase). Application engineering: call 866-418-1777 for sizing, layout, and accessory recommendations.
A 6 inch extension for the 20 inch manhole on a Norwesco underground tank
Part number 63514 is Norwesco's 20 inch manhole extension, 6 inches tall, moulded in black polyethylene. It raises the...
The Norwesco 6 Inch Manhole Extension is a molded polyethylene riser that adds height above a tank's manhole opening. It stands 8 inches tall, weighs about 10 pounds, and carries a 24 x 24 inch...
The Norwesco Manhole Extension is a black polyethylene riser measuring 20 inches in diameter by 15 inches high and weighing 13 pounds empty. It raises the height of a tank's existing manhole access...
The Norwesco 15 Inch Manhole Extension is a black polyethylene riser that raises the height of a tank manhole opening. It stacks onto the manhole collar so the lid sits higher, useful when the access...
The Norwesco Manhole Extension is a 20-inch diameter by 24-inch tall steel riser that raises an existing manway collar to the height your installation needs. At roughly 15 lb empty with a 20 x 20...
The 24 Inch Manhole Extension is a Norwesco polyethylene riser that raises an existing 24-inch tank manhole opening, giving you added standoff height above the tank top. It measures 24 inches across...
A 225 gallon green septic pump tank approved for Florida installs
The Norwesco 225 gallon septic pump tank, part number 44788, is the Florida-only version of Norwesco's small buried pump chamber: a...
A 300 gallon green septic pump tank approved for Florida installs
The Norwesco 300 gallon septic pump tank, part number 44789, is the Florida-only version of Norwesco's buried pump chamber at this...
A 200 gallon black polyethylene septic pump tank for a buried dosing chamber
The Norwesco 200 gallon septic pump tank, part number 43745, is a round black polyethylene tank 47 inches in diameter and...
A 225 gallon underground pump tank for a septic system that needs a lift
The Norwesco 225 gallon underground septic pump tank, part number 43551, is a one piece polyethylene tank built to be buried:...
A 300 gallon septic pump tank for a dosing or lift station
The Norwesco 300 gallon septic pump tank, part number 41319, is a black polyethylene tank 54 inches in diameter and 54 inches tall,...
A 300 gallon grey pump tank for a septic dose chamber or a small holding job
The Snyder Industries 300 gallon septic pump tank, part number 5260000W94201, is a grey polyethylene tank 48.5 inches...