

Tank size is another detail you’ll need to consider when planning how to build a root cellar from a septic tank. You won’t need the plastic fittings or effluent filter found inside most septic tanks, so ask the supplier to remove these before delivery. As long as the tank is solid and sound, a chipped edge or a patchable hole won’t prevent it from being a root cellar. Suppliers sometimes offer discounts on these flawed tanks. A percentage of all precast concrete septic tanks end up with small manufacturing defects that prohibit them from being used for sewage treatment. You’ll want to buy an unused septic tank for this root cellar design, but look for a deal to avoid paying full price.

By following the plans, you’ll cut an entrance, install a door, add a pair of vent pipes and cover the tank with soil to bring an old-fashioned, walk-in cellar into your modern life. And while there are myriad ways to store vegetables, our innovative root cellar plans show you how to build a root cellar by modifying a new, precast concrete septic tank. The cool, moist and dark conditions of a root cellar make it the perfect place to keep many fruits and vegetables crisp and delicious for weeks - even months - of storage. This modern root cellar design turns a never-used septic tank into outdoor walk-in storage. Stow your surplus with these underground root cellar plans. Make this root cellar by burying a new concrete septic tank into a hillside.
