Water Distribution Grade 1 Certification Practice Exam

What role does chlorination play in water treatment?

1. It enhances flavor

2. It controls algae growth

3. It disinfects water to kill pathogens

4. It adjusts pH levels

The correct answer is: It disinfects water to kill pathogens

Chlorination serves a crucial role in water treatment primarily by disinfecting water to eliminate harmful pathogens. The process involves adding chlorine or chlorine compounds to the water supply, which effectively targets bacteria, viruses, and other microbial contaminants that can pose health risks to consumers. Through the formation of chloramines and other disinfectant byproducts, chlorine maintains a residual effect, ensuring that any potential pathogens are eliminated throughout the distribution system. The significance of chlorination lies in its ability to make treated water safe for human consumption. This process is essential for preventing waterborne diseases, which can arise from untreated or inadequately treated water supplies. While chlorination may also have some secondary benefits, such as potentially controlling algae growth and contributing to taste and odor control, its primary purpose is ensuring the microbiological safety of drinking water.