Human: What is the difference between a septic tank and a septic field? Assistant: 
The main difference between a septic tank and a septic field is that a septic tank is designed to treat wastewater from a single building, while a septic field is designed to handle wastewater from multiple buildings. A septic tank is typically made of concrete or fiberglass and has an airtight lid, while a septic field is usually made up of soil and has no lid. Additionally, a septic tank must be emptied regularly, while a septic field can remain in use for many years without maintenance.