🚰 Water and plumbing

Long before water reaches your tap, it usually starts in a river, lake, or a deep well, then travels to a treatment plant built specially to clean it. At the treatment plant, workers filter out dirt and add safe amounts of chemicals that kill harmful germs, checking the water carefully at every step. Powerful pumps then push that clean water through a huge network of underground pipes, all the way to the smaller pipes hidden inside your own walls.

After a flush, water and waste travel through pipes to a sewer system, a huge network of tunnels running under the streets that carries everything toward a wastewater treatment plant. At that plant, machines and helpful bacteria break down and filter out the waste in several careful stages, cleaning the water bit by bit. Once it is clean enough, that water is often released back into a river or the sea, continuing on in the same water cycle it started in.

Water expands, meaning it takes up more space, when it freezes into ice, and pipes are not built with that extra room in mind, so a frozen pipe can crack or even burst. Pipes that run through cold places, like an outside wall or an unheated garage, lose heat fastest and are most likely to freeze on a very cold night. Letting a tap drip slightly, or keeping a home a bit warmer, keeps water moving or slightly warmer, which helps stop it from turning solid inside the pipe.

Water alone struggles to wash away oil and grease, since water and oil naturally push apart from each other instead of mixing. Soap molecules have one end that grabs onto oil and dirt and another end that loves water, so they act like a tiny bridge, pulling grease away from a surface and into the water. Once the soap has grabbed onto the dirt, rinsing with water carries the whole soapy, dirty mixture away down the drain.