How common is chlorine disinfection of drinking water?

Chlorine is by far the most commonly used drinking water disinfectant in all regions of the world.  Today, about 98 percent of U.S. water treatment systems use some type of chlorine disinfection process to help provide safe drinking water.  The U.S. Environmental Protection Agency requires treated tap water to contain a detectable level of chlorine to protect against germs as it flows from the treatment plant to consumers' taps.

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1. What is Free Chlorination?
2. What is Free Chlorine?
3. What is Chloramine?
4. How is chlorine added to drinking water?
5. How long has U.S. drinking water been chlorinated?
6. How common is chlorine disinfection of drinking water?
7. Is chlorine in drinking water safe?
8. How long will the free chlorination process last?
9. Is this the first time the City of Deerfield Beach has used free chlorintation?
10. Do other cities perform free chlorination?
11. Does free chlorination change or affect water quality?
12. Will I notice a change in my water?
13. Why does my water taste/smell different?
14. What can I do to improve the water taste/smell?
15. Why are you doing this during this time of the year?
16. What are the methods for removing chlorine/chloramines from fish aquariums?
17. I notice the hydrant on my street flowing, is this part of the free chlorination process?