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Choose a Septic Tank System


Image of on-lot collection tank for Orenco Sewer
On-lot collection tank for Orenco Sewer

Gravity Septic

As wastewater enters the septic tank in a gravity system, it pushes effluent out the other end to the drainfield through a network of pipes. This is called “gravity flow” to the drainfield, and these systems don’t need a pump.

The most important part of a gravity septic system is the septic tank, because a good-quality tank can remove two-thirds or more of wastewater contaminants.* The right tank has to be properly sized, watertight, and structurally sound. Leaking tanks pollute your yard and the groundwater. They also allow groundwater to flow into your tank, which overloads your drainfield and shortens its life.

Your septic tank also needs to have access risers to-grade (showing above the ground) that are equipped with durable, bolted lids. These risers and lids give service providers access to your tank – without having to dig it up – so they can check the sludge and scum levels inside. Then, they can pump your tank when the levels get too high. And bolted lids make sure your system is safe for kids and pets.

Also, make sure your tank is equipped with an effluent filter. An effluent filter removes large particles from the wastewater before it flows to your drainfield. This extends your drainfield’s life and protects your investment.


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