Quoted from this article on chlorine in water
The EPA warns that levels that exceed the regulated amounts will be harmful.
The agency’s conventions state that the allowable chlorine levels in drinking water may be up to 4 parts per million. This stipulation has a wide margin of error, so if higher levels of chlorine are mistakenly added, most drinkers will still be safe while action is taken to correct the error.
So the environmental protection agency states we should not exceed 4 parts per million, Link to the full report on contaminants in drinking water. The article you posted is about chlorine levels being lowered from 1 to 0.5 parts per million. So they would have to increase the old concentration by 4x or the new concentration by 8x to be at risk.
Assuming other towns in the US work on a similar concentrations (The uk stays below 1ppm) these levels are not generally harmful to humans.
Doing some more digging I would say that there does seem to be a correlation between consumption of chlorinated water and bladder cancer but claims of other adverse effects are not that strong.WHO paper, Study on Carcinogenic Potential , Study on bladder cancer, Study on delivery . These studies also point to adverse effects not being present when using Chlorine dioxide which is claimed to be in widespread use but is lacking citations on wikipedia.
It's important to remember water chlorination has been vital in combating waterborne diseases. I can't find figures of deaths before water chlorination became common in modern culture but even now waterborne disease account for 3.4 million deaths annually in places with unclean water, things like typhoid, polio, cholera, malaria