Americans think that they are drinking pure water bu that's not the case there are millions of Americans who are drinking unsafe water obtained from source that does not contain safe drinking water. Americans have to pay more money if they want to drink pure water and that is not the case in rural areas. According to some officials water in U.S is safe but still in some areas Americans are drinking unsafe water and that problem is increasing every year.
Unsafe water can cause diseases especially when it contains bacteria that is responsible for bacterial contamination. The problem is small water system in counties like Texas can not afford to install latest technologies that's why they are drinking contaminated water.
They first need to stop bacteria to get into the water and then if there are microbes in bacteria then there is need to kill them. In Texas due to high temperature it become easier for bacteria to breed that's why there is need to install wood chip bioreactors to reduce the amount of nitrates in run off water.
Image Source : https://www.usatoday.com/story/news/2017/08/14/63-million-americans-exposed-unsafe-drinking-water/564278001/