Quick answer: A riser is a sealed shaft from the tank opening to the surface, with a locking lid. It usually pays for itself through lower digging charges on future pumpings and inspections, and it makes Title 5 inspections easier when you sell.
Why add a riser
- No digging: many pumpers charge extra to locate and uncover a buried cover.
- Faster service and easier inspections, including at sale
- Easier maintenance of effluent filters and pump chambers
- Less lawn damage every 2–3 years
What to ask for
- Risers over the tank's main access openings (and the pump chamber, if you have one)
- Watertight joints, so groundwater stays out
- Secure, child-resistant lids that bolt or lock. An open tank is a serious fall hazard.
- An insulated lid in areas with deep frost, if your installer recommends it
When to do it
Install a riser at your next pumping, since the cover will already be dug up. That saves a second excavation.
Related guides
Frequently asked questions
How much does a septic riser cost?
Often a few hundred dollars or more per opening, depending on depth, materials and whether it's done during a pumping. Ask for a quote with your next service.
Do risers let smell out?
Not when properly sealed. A riser with a gasketed, tight-fitting lid shouldn't smell. Odor at a riser means the seal needs attention.
Is a riser required in Massachusetts?
Title 5 has access requirements for new and upgraded systems, and some towns require risers. For existing tanks, adding one is usually optional but recommended.
Last reviewed 2026-11-09. Regulations and prices change. Confirm details with your local Board of Health and your contractor.