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.
These Norwesco self-tapping screws (SKU N-63870) are a steel fastener accessory for tank installation and fitting work, not a storage vessel. Each is a small steel self-tapping screw from the...
The Norwesco N-63514 is a Manhole Extension - not a tank, but a black polyethylene riser collar measuring 20 inches in diameter by 6 inches tall and weighing about 8 pounds empty. It raises an...
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...
The Norwesco Florida Only 225 Gallon Plastic Septic Pump Tank (SKU N-44788) is a green polyethylene pump tank built for the dosing and effluent-handling stage of a Florida onsite system. It holds 225...
The Norwesco Florida Only 300 Gallon Plastic Septic Pump Tank is a green, polyethylene pump tank built for septic dosing and effluent-handling duty in Florida installs. It measures 50" tall on a...
The Norwesco 200 gallon plastic septic pump tank is a 56-inch-tall polyethylene basin built to house a submersible effluent or sewage pump and dose your drainfield on demand. At 47 by 47 inches...
The Norwesco 225 Gallon Underground Septic Pump Tank is a black polyethylene below-grade tank built to hold effluent for pumped septic systems. The numbers to plan around: 225 gallon capacity, 50...
The Norwesco 200 Gallon Low Profile Septic Holding Tank is a black polyethylene tank built for job-site sanitation and temporary holding where overhead clearance is tight. At 20 inches tall on a 48 x...