<human>: What are the benefits of having a septic tank?
<bot>: The main benefit of having a septic tank is that it allows waste to be treated before being released into the environment. This means that harmful substances such as nitrogen, phosphorus and other chemicals can be removed from the wastewater before it enters the environment. Additionally, septic tanks help prevent water pollution by reducing the amount of contaminants entering the water system. Furthermore, they provide an effective way for disposing of human waste, which helps reduce the risk of contamination in groundwater.