Why is water disinfected?

The goal of disinfection for public water systems is to eliminate pathogens that are responsible for waterborne diseases.  More information can be found on the National Center for Biotechnology Information, U.S. National Library of Medicine website.  

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1. What are Nitrates?
2. What is the concern about nitrate/nitrite in drinking water?
3. What is the treatment for Nitrate?
4. What are resin beds in drinking water?
5. Why is water disinfected?
6. What is the filtration process for the disinfection of bacteria in drinking water?
7. What is water chlorination?
8. Is Chlorine treatment new?