There are some obvious signs that suggest the septic tank may need to be pumped. Standing Water or debris residue around the drain in the shower or bath or a wet area over the tank might be a sign the tank needs pumping or it could be just the line is plugged. If it is a plugged line, a cable rooter fed down the line from the cleanout to the tank should be sufficient. Standing water above the tank requires an examination of the tank itself. If you do not have an exposed cover on the tank, digging will be required. See FAQ How can I find my septic tank and leach field for help in locating the tank. When exposed, if water is standing above the 3 inch pipe entering the tank, the tank should be pumped. While pumping listen for water flowing back into the tank from the leach field. This could indicate a clogged, compromised, or saturated leach field.
Depending on the situation and the clog, the leach field could be corrected by adding TankTechsRx for Septic Systems to the septic tank.
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There is standing water in the shower/ bathtub
What is the standing / ponding water in the yard?