Yes, chlorine has been used for the past 100 years or so to make tap water safer. It acts as a disinfectant. When it was first used we saw a dramatic decline in cholera and typhoid deaths. There are other health concerns about it though, since it is considered a poison.
Many water treatment plants in the use chlorinate their water for disease vector control. However, as a second or sometimes third stage water treatment program, many facilities semi-de-chlorinate their water to improve the taste and reduce the amount of chemical chlorine present in the water so people are consuming less of it.
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