What action is required if water is drained from a tank?

When water is drained from a tank, particularly in a water treatment facility, it is essential to dechlorinate the water before it is discharged. Chlorine is commonly used in water treatment as a disinfectant and can be harmful to aquatic life if released directly into the environment. Dechlorination involves removing or neutralizing chlorine from the water, ensuring that any remaining water being discharged does not pose a risk to fish, plants, or other organisms in nearby water bodies.

This process is part of adhering to environmental regulations and best practices, as it helps protect ecosystems and maintains compliance with local and state water quality standards. In addition to safeguarding the environment, dechlorination may also prevent damage to drainage systems and reduce the risk of unpleasant odors in the sewage system.

Other options represent practices that do not adequately address environmental concerns or regulatory compliance. For example, releasing water directly into any drain could lead to potential contamination and harm to local wildlife. Treating the water with chemicals for safety may not be practical or necessary in every situation, and failing to follow a specific procedure altogether could result in legal ramifications and environmental issues.