The EPA guidelines limit chlorine content in potable water to 1 PPM. That is well below the level at which even the most sensitive person is affected. The probl

The EPA guidelines limit chlorine content in potable water to 1 PPM. That is well below the level at which even the most sensitive person is affected. The problem is this guideline has no legal enforcement mechanism, so whether or not your municipal water district follows it is up to them. If they're not, they're not practicing evidence-based anything. They're ignoring evidence-based guidelines for some other reason. Whether any US water district is really doing this seems debatable anyway. Maybe this is just a consequence of the poor state of search engines, but every source I can find claiming specific US water supplies contain unsafe levels of chlorine seem to be exclusively limited to companies trying to sell you expensive filtration systems you almost certainly do not need.