How To Find Septic Tank Lid. Most septic tanks are rectangular and measure about 5 feet by 8 feet. Septic tank lids are typically green or black plastic;
That is probably your septic tank, and you will find the lid in that area. Outside the home, in the same side of the house where the lines are located, look for a melted area of snow, about 36″ or more wide. Many people don’t know where their septic tank is, or even if they do know, it can be difficult to dig in the winter when the ground is frozen.
This will be in the basement region.
In your basement, locate the area where the septic lines leave your home. The first thing you need to do is to find your septic tank’s lid. Septic tank lids are typically green or black plastic; You will need probes or metal detectors for the purpose.