Municipal water supplies are disinfected by treatment either with chlorine or with ozone.One advantage which chlorine has over ozone is that

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Chlorine treatment provides residual disinfection which continues to protect against microorganisms after the water leaves the treatment plant. Ozone treatment does not provide residual disinfection. Option A is incorrect because both chlorine and ozone kill viruses. Option B is incorrect because chlorinated hydrocarbons have negative health effects. Option C is incorrect because chlorine can produce an unpleasant taste and odor in water, not ozone.

Municipal Water Supplies Are Disinfected by Treatment Either with Chlorine