Human: How do I know if I have a clogged septic system? Assistant: 
You can check for signs of a clogged septic tank by looking for an accumulation of debris or sludge at the bottom of the tank, which may indicate that the tank is not working properly. Other symptoms include foul odors coming from the tank, slow drainage from the tank and toilet, and back-up in the sewer line. If you suspect your septic system has a clog, contact a professional to inspect it.