The answer to 'what is septic tank' is a septic tank is an underground wastewater treatment system used in areas without access to a municipal sewer system. It is a self-contained system that collects, treats, and disposes of household wastewater on the property. The septic tank is typically made of concrete, fiberglass, or plastic and is buried underground near the home.
The septic tank allows solids to settle and liquids to flow out into a drain field or leach field, where the wastewater is further filtered and treated by the soil. This system relies on natural processes to break down and dispose of the waste, making it a sustainable option for homes not connected to a public sewer.