If your septic tank lids are buried, installing risers is the single highest-ROI upgrade you can make to your septic system. This guide covers how risers work, how to choose the right size, which kits are best, and whether to install them yourself or hire a professional.
Why Risers Matter
Every time a septic professional services your tank, they need to access the lids. If those lids are buried 6 to 24 inches underground, someone has to dig them out. That's $50 to $200 added to every pumping, inspection, or repair visit.
Over the life of your system (20 to 30 years with pumping every 3 to 5 years), that's $300 to $1,500 in digging fees alone. A riser eliminates that cost permanently.
It also means:
- •You can visually check your tank's access point anytime
- •Service calls are faster — the crew arrives and starts immediately instead of digging for 30 minutes
- •Emergency access during a backup is immediate instead of delayed
- •You always know exactly where your tank is located
Most tanks installed since the early 2000s come with risers from the factory. But millions of older tanks, especially concrete tanks installed before 2000, have buried lids with no risers. If you own one of those, this upgrade is for you.
How to Choose the Right Riser
Three measurements determine which riser kit you need.
1. Diameter
Risers come in three standard diameters: 16-inch, 20-inch, and 24-inch. The diameter must match your tank's existing access opening.
| Diameter | Common On | Notes |
|---|---|---|
| 16-inch | Older tanks, smaller access ports | Less common, limited product selection |
| 20-inch | Most residential tanks | The most common size for retrofitting |
| 24-inch | Newer tanks, larger access openings | Provides the most working room for service |
If you're unsure of your opening size, measure the inside diameter of the hole in the top of your tank after exposing it. Or check your as-built drawing from the health department.
2. Height
Measure the distance from the top of your tank to ground level. Risers come in standard heights (6-inch and 12-inch) and can be stacked to reach the exact height you need.
For example, if your tank lid is 18 inches below grade, you'd use a 12-inch riser plus a 6-inch riser stacked together. Most kits include one riser section. Additional sections are sold separately.
3. Tank Material
The adapter ring needs to seal properly to the tank surface. Concrete tanks require an adapter ring that bonds using butyl sealant or adhesive. Plastic and fiberglass tanks may need a different adapter.
Best Septic Tank Risers: Our Picks
Best Overall: Polylok 20" Riser Kit (14" Tall)
Best OverallIncludes: 20" adapter ring, 20"x12" riser, 20" flat lid, 20" safety screen, installation kit with stainless steel screws and sealant
Polylok is the industry standard for septic risers. This kit includes everything needed for a complete installation with no additional purchases required. The 20-inch diameter fits the majority of residential tanks. The 14 inches of height handles most buried-lid situations. Additional 20-inch risers can be stacked on top if you need more height. The safety screen is a critical inclusion that prevents anyone from falling into the tank if the lid is removed. Made in the USA from heavy-duty polyethylene.
Best for: Most homeowners retrofitting risers onto an existing concrete or plastic tank with a 20-inch access opening.
Check Current Price on AmazonBest 24-Inch: Polylok 24" Riser Kit (14" Tall)
Best 24"Includes: 24" adapter ring, 24"x12" riser, 24" flat lid, 24" safety screen, installation kit with stainless steel screws
Same quality as the 20-inch kit but for tanks with larger 24-inch access openings. The larger diameter provides more working room for the pumping crew and makes filter cleaning easier. Stackable for additional height. The 24-inch safety screen is rated at 250 lbs per square foot. This is the size most septic professionals prefer because it gives them the best access.
Best for: Newer tanks with 24-inch openings, or homeowners who want maximum service access.
Check Current Price on AmazonBest Budget: Tuf-Tite 20" Bundle
Best BudgetIncludes: 20"x12" riser, 20" domed lid, 20" adapter ring, stainless steel screws
Tuf-Tite is the other major name in septic risers and their products are widely used by professional installers. This three-piece bundle costs less than the Polylok equivalent while offering comparable durability and fit. The domed lid sheds water and debris better than a flat lid in areas with heavy rain or leaf fall.
Note: This bundle does not include a safety screen. If you want that added layer of protection (recommended, especially with children on the property), you will need to purchase the Tuf-Tite safety pan separately ($30 to $50).
Best for: Budget-conscious homeowners who want a reliable riser from a trusted brand at a lower price point.
Check Current Price on AmazonBest for Deep Burial: Polylok 24" Kit + Extra Risers
Deep BurialIncludes: 24" adapter ring, 24"x6" riser, 24" flat lid, 24" safety screen, installation kit
This kit starts at 8 inches of height, but the real advantage is that Polylok 24-inch risers stack. If your tank is buried 24 to 36 inches deep, you buy this base kit plus two or three additional 24"x12" riser sections ($50 to $80 each) and stack them to reach grade. The system seals between sections with butyl rope sealant, creating a watertight column from tank to surface.
Best for: Tanks buried more than 18 inches below grade that need multiple riser sections stacked to reach the surface.
Check Current Price on AmazonBest Complete Bundle: Tuf-Tite 20" Four-Piece
Complete BundleIncludes: 20"x12" riser, 20" domed lid, 20" adapter ring, 20" safety lid
This bundle packages all four essential components from Tuf-Tite into a single purchase. The safety lid is included (unlike the standard Tuf-Tite kit), so you do not need to buy it separately. The domed lid design is practical for areas with rainfall. All hardware included.
Best for: Homeowners who want a complete, safety-included package in a single order.
Check Current Price on AmazonRiser Cost Breakdown
The total cost of adding risers depends on two factors: the kit itself and whether you install it yourself or hire a professional.
| Item | DIY Cost | Professional Cost |
|---|---|---|
| 20" riser kit (single section) | $100 – $200 | $100 – $200 |
| 24" riser kit (single section) | $150 – $300 | $150 – $300 |
| Additional riser sections | $50 – $80 each | $50 – $80 each |
| Butyl sealant | $10 – $20 | Included |
| Installation labor (per access point) | $0 (your time) | $100 – $300 |
| Total per access point | $110 – $300 | $250 – $600 |
Most residential tanks have two access points (inlet and outlet). If you're doing both, double the cost above. Many homeowners install risers on both access points at the same time to save on labor.
The math is simple: if your pumping company charges $100 to dig out your lids, the riser pays for itself by the second or third service visit. After that, every visit saves you money.
DIY vs. Professional Installation
Riser installation is one of the few septic tasks that a handy homeowner can realistically do themselves. Here's what's involved:
DIY Installation Steps
- Locate your tank and dig down to expose the access lid(s)
- Clean the top surface of the tank around the opening
- Apply butyl sealant rope around the opening
- Set the adapter ring onto the sealant and press firmly
- Stack riser sections to reach ground level
- Apply sealant between each section
- Secure with stainless steel screws
- Install safety screen and lid
- Backfill around the riser with soil
The entire process takes 2 to 4 hours per access point for someone comfortable with basic tools and manual digging. The hardest part is the digging, especially in clay or rocky soil.
When to Hire a Pro
- •Your tank is buried more than 24 inches deep
- •You're not sure where your tank is located
- •The existing concrete lid is cracked or damaged and needs replacement
- •You want the riser installed during a scheduled pumping visit (many companies offer a discount when combined)
- •Local codes require a licensed installer for septic work
Ask your pumping company about riser installation during your next service. Many will install risers while they already have the tank exposed, saving you the digging cost entirely.
Frequently Asked Questions
How much does a septic tank riser cost?
A complete riser kit costs $100 to $300 for a standard 20-inch or 24-inch single-section kit. Professional installation adds $100 to $300 per access point. Most residential tanks have one or two access points, so total installed cost is $200 to $600 for the complete job.
Are septic tank risers worth it?
Yes. Risers eliminate $50 to $200 in digging fees at every service visit. With pumping every 3 to 5 years plus annual inspections, the riser pays for itself within two to three visits and saves money for the remaining life of the system.
Can I install a septic tank riser myself?
Yes. Riser installation is a manageable DIY project for homeowners comfortable with basic tools and digging. The process takes 2 to 4 hours per access point.
What size riser do I need?
Measure the inside diameter of your tank access opening. The three standard sizes are 16-inch, 20-inch, and 24-inch. The 20-inch size fits the majority of residential tanks.
Do I need a riser for every access point?
Ideally yes. Most residential tanks have two access points. The outlet side is the most important because that is where the effluent filter is located. At minimum, install a riser on the outlet access point.
Will a riser affect my lawn appearance?
Riser lids sit at or slightly above ground level. They are typically green or black and about 20 to 24 inches in diameter. Most homeowners find them unobtrusive.
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