Human: What's the most important thing to know about a septic tank? Assistant: 
The most important thing to know about a septic tank is that it should be properly maintained and serviced regularly by a professional. Regular maintenance can help ensure that the system functions properly, preventing any potential issues from developing. Additionally, if you suspect there may be an issue with your septic tank, contact a licensed plumber as soon as possible so that they can inspect and diagnose the problem.