What is the required chlorine treatment after installation or repair of a water line?

The required chlorine treatment after the installation or repair of a water line is aimed at ensuring the water system is disinfected effectively to eliminate any harmful microorganisms that might have entered during the process. Administering a chlorine concentration of 50 mg/L for a duration of 24 hours is the recommended standard procedure in many guidelines.

This higher concentration level is critical because it provides an adequate disinfection process that can mitigate risks associated with pathogens and ensure that the water quality meets safety standards. Furthermore, the duration of 24 hours allows for the chlorine to remain in contact with the walls of the pipe system, thereby ensuring thorough disinfection.

While other options present lower concentrations or alternative compounds like chloramine, they do not meet the effectiveness needed for initial disinfection in newly installed or repaired lines, especially considering the potential contamination risks. The standard practice prioritizes a robust disinfection approach to protect public health.