North Carolina C-Well Exam 2 Practice Test

How does chlorination affect distribution system safety and corrosion control?

Increases residual disinfection without any other considerations Provides residual disinfection in the system; pH and corrosion control measures may be needed to prevent corrosion Causes immediate corrosion in all pipes Decreases disinfection over time

Correct Answer:

Provides residual disinfection in the system; pH and corrosion control measures may be needed to prevent corrosion

Explanation:

Chlorination keeps a disinfectant residual in the distribution system, which is crucial for preventing microbial growth as water moves toward consumers and ensuring safety beyond the treatment plant. At the same time, the chemistry of chlorine interactions with pipe materials means you can’t rely on disinfection alone—pH and corrosion control measures may be needed to prevent metal from corroding into the water. Maintaining an appropriate pH helps minimize corrosion of pipes and reduces the release of metals, while corrosion inhibitors and alkalinity management support a protective environment for the plumbing. So the best approach combines a stable disinfection residual with chemistry control to limit corrosion and protect both water quality and the distribution system.

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