What Are Septic Tank Risers

A septic tank riser is an extension between the septic tank's access port to the ground, providing easy access to the septic system. Risers are typically made of concrete or plastic and are usually 20" to 24" in diameter.

Septic tank risers are beneficial because they:

Reduce maintenance costs: Risers eliminate the need to dig up the yard for maintenance and pumping, which can save time and money.
Allow access in winter: Risers provide access to the septic system even when the ground is frozen.
Make the manhole cover visible: Risers make the manhole cover visible at all times, which can help locate it.

Benefits of Septic Tank Risers

Septic tank risers create surface level access to your septic tank system. The primary benefit of installing septic tank risers is a significant reduction in ongoing maintenance costs by improving the ease of access to the internal plumbing in your system. Septic tank risers allow for inspections, repairs, maintenance, and pumping to be completed without the need for digging.

Which Riser is Best For My Tank

If you're installing a new septic tank, you should use the manufacturers riser when possible. If you're adding a riser to an existing concrete septic tank and don't know who the manufacturer is, we recommend the PolyLok riser system.

The PolyLok system allows for universal connection to concrete septic tanks by using the base plate adapter. From there, you can choose either a 20" or 24" diameter, and select your height in 6" or 12" increments. We recommend a maximum of 36" depth for your riser to ensure it remains structurally stable.

Riser Components

There are a few key pieces required to build your septic tank risers, with each project requiring a customized combination of parts. Below you’ll find the main components required for most projects.

Cast in Pan: Designed to be molded into the concrete tank and safety screen directly, allowing standard risers to attach easily.

Adapter Ring: Easily convert multiple riser types. Great for projects with existing risers that may be from a different or unknown manufacturer.

Square Flange Adapter: Designed with a large rectangular flange that allows you to retrofit your square concrete tank access to accept standard 24” diameter risers.

Riser: High strength HDPE lid with UV additives come in three different sizes. 3” x 24”, 6” x24”, and 12” x 24”. Designed with gaskets to ensure air and water tightness, and screw holes to connect to the other components of your riser system.

Safety Screen: Safety screens can be secured to the inner ring of your riser stack, and are designed to support up to 1,000 lbs. They also feature a 4 ½” opening to allow for the vacuum hose during clean up.

Septic Lid: High strength HDPE lid with UV additives to resist fading. Lids come with an anti-slip surface and integrated handles.