How To Check If Your Septic Tank Is Full. Here are some of the most prominent signs that indicate your septic tank is full. Toilets, in particular, should be checked for any functional issues and abnormal flushing.
You should empty the tank as soon as you notice the smell. Slow drains sewage backup pooling water abnormally green grass bad odor outside or in the house high nitrate content in well water slow drains one of the easiest clues that your septic tank might be full is when the water in your drains begins to go down slowly. The inspector will then use a dye test as proof.