A leach field is a part of a septic system that is responsible for the wastewater treatment process. The leach field is composed of a network of underground pipes that are buried in gravel-filled trenches. However, there are a few synonyms that are used to refer to a leach field. Some of the most common synonyms include disposal field, drain field, and absorption field. These terms are used interchangeably to describe the same type of system. Regardless of the term used, a leach field is a crucial part of a septic system as it ensures that wastewater is properly treated and disposed of in a safe and effective way.