A riser reduces the cost of maintaining the system for the long term. It reduces the cost of digging fees. Your lawn is never disturbed, therefore reduces lawn damage. It’s helpful for trouble shooting, if a filter is clogged or you need to check the effluent in the tank, unscrew the cover and pop the lid. A Riser lessens the risk of soil and other debris from entering the pumping process. Riser covers have a better seal than concrete covers, which keeps surface water from entering the tank as well as keeps odors from entering the air. It can also add to your resale value.