Septic Tank Risers
Everything you need to know about septic tank risers — what they are, why every septic system should have one, how much they cost, and how installation works.
What Is a Septic Tank Riser?
A septic tank riser is a vertical pipe or cylinder that connects the access opening on top of your buried septic tank to ground level (or just above it). It is topped with a secure, gasketed lid that sits flush with or slightly above the surface of your yard.
Without a riser, a septic technician has to locate and excavate the buried tank lid every time you need a pump out or inspection — often digging 6 to 24 inches of soil. This adds $50 to $200 in extra labor to each service call. A riser eliminates that digging permanently.
Risers come in various diameters (typically 12, 20, or 24 inches) and heights (6 inches to several feet) to match the depth and configuration of your tank. Most modern septic tanks are installed with risers standard, but older systems almost always lack them.
Why Install a Septic Tank Riser?
Adding a riser to your septic tank is one of the best small investments you can make as a septic system owner. Here is what it gets you:
Types of Septic Tank Risers
There are two main riser materials, each with trade-offs:
| Feature | Plastic (Polyethylene) | Concrete |
|---|---|---|
| Cost (riser only) | $80–$200 | $150–$350 |
| Weight | 10–25 lbs | 50–200+ lbs |
| Installation | DIY-friendly | Requires machinery |
| Durability | 30+ years | 40+ years |
| Corrosion resistance | Excellent | Can degrade over time |
| Watertight seal | Gaskets included | Needs sealant |
| Most common for | Residential | Commercial / heavy traffic |
For most homeowners, a plastic riser kit is the best choice. Concrete risers are better suited for commercial properties or areas with vehicle traffic over the tank.
How Much Does a Septic Tank Riser Cost?
The total cost to add a riser to your septic tank depends on the riser material, diameter, how deep your tank is buried, and whether you hire a professional or DIY.
| Cost Component | Price Range |
|---|---|
| Plastic riser + lid kit | $100–$300 |
| Concrete riser + lid | $150–$350 |
| Professional installation labor | $150–$300 |
| Adapter ring (if needed) | $30–$75 |
| Sealant / butyl rope | $10–$25 |
Total installed cost: Most homeowners pay $250 to $600 to have a riser professionally installed. If your tank is buried more than 2 feet deep, you may need stacking extensions that add $50-$100 each.
Many pumping companies will install a riser during a scheduled pump out at a reduced labor rate. See the full pumping cost guide.
How Risers Are Installed
Professional riser installation is straightforward and typically takes 1 to 2 hours. Here is what the process looks like:
1. Excavate the tank lid
The technician digs down to expose the existing concrete or fiberglass access opening on top of the tank.
2. Clean and prepare the surface
The area around the opening is cleaned and roughened so the sealant bonds properly.
3. Apply butyl sealant
A continuous bead of butyl rope or polyurethane sealant is applied around the tank opening to create a watertight seal.
4. Set the riser and adapter
The riser (with adapter ring if the opening is non-standard) is placed on top of the sealant and pressed firmly into place.
5. Attach the lid
A gasketed, secure lid is fastened to the top of the riser. Lids can be bolted or screwed to prevent unauthorized access.
6. Backfill around the riser
Soil is packed around the riser to hold it in place, leaving the lid at or just above ground level.
Septic Tank Riser Kits
Riser kits bundle everything you need into a single package: the riser body, a secure lid, an adapter ring for the tank opening, gaskets, and butyl sealant. Popular brands include Tuf-Tite, Polylok, and Orenco.
Kits are available at home improvement stores and septic supply dealers. Most residential kits use a 20-inch or 24-inch diameter riser, which provides enough room for a pumping hose and visual inspection.
Tip: Before ordering a kit, measure the diameter of your existing tank opening and the depth from the top of the tank to ground level. Most kits come with 12-inch riser sections that can be stacked for deeper installations.
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Frequently Asked Questions
What is a septic tank riser?
A septic tank riser is a cylindrical pipe (typically 12-24 inches in diameter) that extends from the top of your buried septic tank to ground level. It provides easy access to the tank for pumping, inspection, and maintenance without having to dig up the yard each time.
How much does a septic tank riser cost?
A septic tank riser costs $100 to $300 for the riser and lid, plus $150 to $300 for professional installation. Total installed cost is typically $250 to $600 depending on the depth of your tank and the material you choose.
Can I install a septic tank riser myself?
While some handy homeowners install risers themselves using kits, professional installation is recommended. The job involves excavating around the tank opening, properly sealing the riser to the tank with butyl rope or sealant, and ensuring a watertight connection that prevents groundwater infiltration.
Are plastic or concrete risers better?
Plastic (polyethylene) risers are the most popular choice for residential installations. They are lighter, easier to install, corrosion-resistant, and less expensive than concrete risers. Concrete risers are heavier and more durable but prone to cracking over time and cost more to install.
Do septic tank risers smell?
Properly installed risers with a tight-fitting, gasketed lid should not produce any odor. If you notice a smell, the lid gasket may need replacement or the riser-to-tank connection may not be properly sealed. Modern riser lids are designed to be airtight.