Yeah, dirty water is the cause of many infectious diseases, which chlorine added to our drinking water in small amounts kills, however the chemicals also harm our gut bacteria which we depend on to break down our food and keep our gut clean, healthy and disease free. A healthy gut biome is also tied to good mental health. Add all the other chemicals in our water and clean sediment in our drinking water isn't so bad...sigh

There’s no debate that chlorinating our water kills off a wide array of malignant bacteria—just try drinking the tap water in countries that don’t fully disinfect it. Much less is known, however, about chlorine’s effect on good bacteria that help preserve healthy digestive systems. We simply don’t know enough about the microbial ecosystem in the human gut to identify every type of bacteria that’s important, much less how well those bacteria survive when we guzzle mildly chlorinated tap water.