What is a "chlorine burn" and is it different than "chlorine maintenance" or "TCD"?

NTMWD and its customer cities call the process chlorine maintenance because they do not increase the chlorine concentration in the chlorine maintenance period.  Some utilities may actually increase chlorine concentrations during this period, hence use of the “chlorine burn” terminology.

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1. What is temporary change in disinfectant (TCD)?
2. What is a "chlorine burn" and is it different than "chlorine maintenance" or "TCD"?
3. Can you reduce the amount of chlorine in the water so the taste and odor isn’t as noticeable and disinfection byproducts (DBPs) are reduced?
4. What are disinfection by-products (DBP)?
5. Does Allen comply with DBP limits? How do we know tests are accurate?
6. Does our water system contain any lead pipes?
7. How does Allen regulate levels of lead and copper?
8. Where can I learn more about lead and copper in drinking water?
9. Where does the list of regulated contaminants and allowed concentration limits or ranges come from?
10. How are new contaminants selected for the list of contaminants and how are the limits established?