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...

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 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 300 Gallon Septic Pump Tank (SKU N-41319) is a black, polyethylene basin built for the dose-and-discharge stage of a septic system, where effluent collects until a pump lifts it to a...

The Norwesco 500 Gallon Plastic Septic Pump Tank is a black polyethylene chamber built to hold and discharge effluent in a pumped septic system - the dosing or pump chamber that lifts wastewater to a...

The Norwesco 500 gallon single-compartment septic tank (SKU N-41320) is an IAPMO-certified polyethylene tank for residential and light-commercial septic systems that need a code-listed wastewater...

The Norwesco 1000-gallon one-compartment septic tank pairs IAPMO certification with a low-profile body built for shallow burial and tight excavation depth. The tank holds 1,000 gallons in a single...

The Norwesco 1000 Gallon One Compartment Septic Tank is an IAPMO-certified, single-chamber polyethylene tank for septic systems. It holds 1,000 gallons in one compartment, measures 102 inches long by...

The Norwesco 750 Gallon Two Compartment Septic Tank is built for installs where vertical clearance is tight. At 51 inches tall on a 60 x 92 inch footprint, this low-profile polyethylene tank drops...