Where do you live? That's certainly not the case everywhere. I drink water straight out of the well, and so does everyone else. It's normal to get a well tested

Where do you live? That's certainly not the case everywhere. I drink water straight out of the well, and so does everyone else. It's normal to get a well tested when you buy a house, but unless you live near a swamp with a shallow well or something weird, you're unlikely to have any problems. There might be a pre-strain filter at the bottom of my well, but that's it. City water definitely does not need to be filtered. Some people prefer the taste of filtered water, but there's no health reason requiring house filtration.