Does my septic tank need to be sealed or can it have a little space for air?
I have a concrete septic tank is concrete with a concrete riser which is about a foot and a half opening which is covered with a round piece of concrete. My question is: Does the cover need to be sealed or does it matter if it fits good except for a little space which air can get in or out.
Septic tanks need to be watertight. The riser should be sealed to the top of the tank and the riser cover should be sealed to the riser with butyl rubber or some other flexible sealant. No liquid should enter or leave the tank. Further information on septic systems, please refer to: https://extension.arizona.edu/onsite-wastewater