Its disinfectant qualities and economy of production have allowed communities and whole cities to grow and prosper by providing disease-free tap water to homes and industry. Some people have grown-up on tap water, and believe the taste of chlorine signifies purity and safety. Well, not necessarily so.
Chlorine is, essentially, bleach.
And what comes out of most municipally delivered faucets is, quite actually, a mild bleach solution. Feel free to consult a physician on that somewhat rhetorical question. Consider some well-known attributes of chlorine. There are others, but those are popularly known. And they're all chlorine by-products.