Ace Your 2026 AWWA Water Treatment Operator Test – Dive Into Success!

Chlorine is widely recognized as the predominant chemical agent used in disinfection processes within water treatment facilities. Its effectiveness in killing bacteria, viruses, and other pathogenic microorganisms makes it a staple in ensuring safe drinking water. Chlorine acts by penetrating the cell walls of microorganisms, disrupting their metabolic processes, and ultimately destroying them.

The use of chlorine also offers residual disinfection, which means that after initial treatment, a small concentration remains in the water as it moves through the distribution system, providing ongoing protection against potential contamination. This characteristic is crucial for maintaining water safety all the way to the consumer's tap.

Ozone is another potent disinfectant but is less commonly used for residual disinfection because it decomposes quickly and does not provide an ongoing protective effect after treatment. Fluoride, while important for dental health, is used primarily to prevent tooth decay rather than to disinfect water. Hydrogen peroxide can also serve as a disinfectant, but it is not as widely employed in conventional water treatment processes compared to chlorine.