When should free chlorine be measured?

Document ID

Document ID TE192

Version

Version 4.0

Status

Status Published

Published Date

Published Date 09/27/2018
Question
When should free chlorine be measured?
Summary
Free Chlorine applications
Answer
Free chlorine is typically measured in drinking water disinfection systems using chlorine gas or sodium hypochlorite, to find whether the water system contains enough disinfectant. Typical levels of free chlorine in drinking water are 0.2 - 2.0 mg/L Cl2, though levels can be as high as 5.0 mg/L. If the chlorine levels will be reported to a regulatory agency, it would be recommended to confirm with local regulations which form of chlorine (free or total) to measure and which methodology to utilize.

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