What is drinking water chlorination?

Drinking water chlorination is the addition of chlorine to drinking water systems. It is the most common type of drinking water disinfection. Disinfection kills bacteria, viruses, and other microorganisms that cause disease and immediate illness. Chlorine is effective and continues to keep the water safe as it travels from the treatment plant to the consumer's tap.

A little over 100 years ago, waterborne diseases like typhoid fever and dysentery were a common part of life in the United States —and a common cause of death, too. In the early 1900s, cities started disinfecting drinking water supplies to kill bacteria, viruses, and other microorganisms. Both the World Health Organization and the Centers for Disease Control and Prevention regard disinfection of drinking water as one of the most important advances in public health.

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1. My water is discolored, is it safe to drink? What do I do?
2. What is backflow and who do I call for questions?
3. Why does the City flush water lines and fire hydrants?
4. Why is all of that water just flowing out of the hydrant and into the street?
5. Why is my water so warm?
6. What is drinking water chlorination?
7. Is drinking water chlorination required?
8. Is chlorinated water safe to drink?
9. What can water systems do about taste and/or smell from chlorination?
10. Is there anything I can do about the taste and/or smell?
11. Are there other options for disinfection besides chlorination?
12. What about bathing or showering with chlorinated water?
13. Does chlorine affect home water treatment, like water softening?