Open lids thoroughly, check inlet and outlet baffles and tees, document cracks or corrosion
https://wiki-square.win/index.php/Inexpensive_Septic_Tank_Pumping_Providers:_Dependable_Take_Care_Of_Your_Home
Open lids thoroughly, check inlet and outlet baffles and tees, document cracks or corrosion, and repair seals to stop groundwater intrusion and exfiltration that can overload the drainfield.