Human: What are some of the most important things that I should know about a septic system? Assistant: 

1. A septic tank is an underground storage tank for sewage.
2. The septic tank must be designed and installed by a licensed professional.
3. Septic tanks must be inspected regularly to ensure they are functioning properly.
4. It is illegal to discharge untreated sewage into the environment.
5. All wastewater from a home must be treated before it enters the septic tank.
6. Failure to maintain a working septic system can cause serious health problems.