Our poly tanks are built from injection-molded, high-density polyethylene, engineered to hold their shape underground while staying lightweight enough for a two-person crew to set by hand. We carry them in single-chamber and two-chamber configurations from 300 USG up to 1530 USG, so whether you are replacing a small residential tank or sizing a system for a larger household, there is a poly option that fits.
A poly septic tank is a one-piece, corrosion-resistant tank molded from polyethylene instead of poured or precast concrete. Because the walls will not rust, pit, or break down the way steel or older concrete can in acidic soil, poly is a solid choice on properties with tight equipment access, a smaller excavator, or a single-person install where a concrete tank's weight is not practical. We fit every poly tank with Polylok access points so risers and lids line up cleanly once it is set.
Poly tank walls are engineered rather than uniform: the shape is molded thicker through the load-bearing zones and ribbed internally so the tank resists the pressure of the surrounding soil once it is backfilled.
This is different from a stock storage tote, and it is why we only supply poly tanks built to septic-specific specifications rather than repurposed containers.
The two-chamber sizes carry an internal baffle wall molded into the same piece, so there is no separate seam to seal between chambers.
Poly tanks need more careful handling in the ground than concrete, and getting the backfill right is the single biggest factor in how long yours will last.
If your site has vehicle traffic anywhere near the tank location, that is worth flagging to your installer before you choose poly over concrete.
Replacing a single part or building out an entire system yourself? Our online store carries the septic parts and accessories you need, and our team is on hand by phone if you want to talk through a spec before you order.
A properly installed poly tank has a long service life, though it depends heavily on backfill quality and whether the site sees traffic loading over the tank. Follow our installation notes above and it will hold up well for decades.
Yes, if the surrounding soil becomes saturated and the tank is not properly backfilled and anchored, since polyethylene is close to the density of water. This is the main reason we ask about your water table and soil conditions before recommending poly over concrete.
Yes. Pumping access works the same way through the Polylok riser and lid, regardless of tank material. Just make sure your pumping contractor knows it is a poly tank so they are careful around the access fittings.
Poly tanks are not rated for vehicle traffic the way concrete tanks are, so the tank location should stay clear of driveways, parking areas, or anywhere heavy equipment might cross.
The two-chamber tanks (1060 USG and up) separate settling from clarification within the same molded unit, which helps with solids retention on larger systems. Our smaller sizes are single-chamber and suit typical residential flow.
Septic system installations in BC fall under the provincial sewage disposal regulation, and burial depth and tank standards are set out there. Check with your local health authority or a qualified installer before you dig.
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Whether you are looking to replace a single part or update your entire septic system by yourself, we carry everything you need to get your septic system up and running. Our expert team members will always take the time to answer any questions you might have about our products, so you can rest assured that you will be receiving expert advice alongside high-quality products and solutions.
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