Where does my pee go when I flush?

Having a toddler in the home can bring up a variety of topics. "Where does my pee go Mommy?" was the question today while we were washing our hands in the bathroom. Ethan then continued to explore the question by opening the cupboard door under the sink and looked to see where the water from the faucet went. "Where does the water go?" We talked about the pipes, how it travels to and from our house, and even took a short field trip down to the basement to listen to the water running through the sewer pipe.