Human: What are the advantages of having a septic tank instead of a sewer? Assistant: 
The main advantage of having a septic tank is that it’s more environmentally friendly. It doesn’t require large pipes to transport waste away from your home, and therefore reduces the risk of contamination in nearby water sources. Additionally, septic tanks can be designed with multiple compartments for different types of waste, so you don’t have to worry about clogging up your pipes. Finally, since they are underground, they are less likely to freeze during winter months.