A team of researchers from the United States and Switzerland has reported the discovery of a previously unknown compound in chloraminated drinking water. Inorganic chloramines are commonly used to disinfect drinking water to safeguard public health from diseases like cholera and typhoid fever. It's estimated that more than 113 million people in the United States alone drink chloraminated water.
I had thought activated charcoal could remove the chemicals. No I don’t mean city scale. I meant after the water comes out of the tap but before you drink it. City water has to be treated to not harbor too many germs.
It does for this. See: https://ponder.cat/post/752896/1007500