Risers for septic tanks should be how far above grade?

The appropriate height for risers on septic tanks is six inches above grade. This height is designed to ensure that the access points to the tank are easily accessible for inspection and maintenance while also allowing for adequate drainage. By being elevated above grade, the risers help prevent surface water from entering the septic system, which could lead to clogs or other operational problems. This elevation also helps reduce the risk of soil saturation around the tank, which is important for maintaining the efficiency of the septic system.

Inadequate elevation could lead to issues such as water pooling around the inlet and outlet, making maintenance more difficult and potentially compromising the integrity of the septic system. So, keeping the risers six inches above grade strikes a good balance between accessibility and functionality, ensuring the system operates effectively while being mindful of surface and groundwater interactions.