Plastic Septic Tanks in Washougal, WA

The Norwesco 20 Inch Domed Septic/Water Lid (MPN N-62408) is a polyethylene septic tank engineered to replace legacy steel and concrete septic tanks — corrosion-immune, lightweight enough for...

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 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 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 500 gallon septic pump tank for a dosing or lift station The Norwesco 500 gallon plastic septic pump tank, part number 40785, is a black polyethylene tank 64 inches in diameter and 67 inches tall,...

A 500 gallon one compartment septic tank that Norwesco lists as IAPMO approved The Norwesco 500 gallon plastic one compartment septic tank, part number 41320, is a yellow polyethylene tank 101...

A 1000 gallon two compartment septic tank with gaskets and tees, built for Canadian installations The Norwesco 1000 gallon two compartment septic tank, part number 44497, is a yellow polyethylene...

A 1000 gallon blue Bruiser two compartment underground tank with gaskets and tees, built for Canadian installations The Norwesco 1000 gallon two compartment Bruiser multi-use underground tank, part...

A 1000 gallon low profile single compartment septic tank with the tees shipped loose The Norwesco 1000 gallon one compartment septic tank, part number 42405, is a green polyethylene tank 127 inches...