Where should recovered wastewater ideally be disposed of?

Disposing of recovered wastewater through a sewer line is the most appropriate method in this context. Sewer lines are specifically designed to transport wastewater for treatment and disposal. When wastewater is conveyed through the sewer system, it is directed to a sewage treatment plant where it can be properly treated and purified before being released back into the environment or reused. This process ensures that contaminants are removed, thereby protecting public health and the environment.

The other options, such as using a storm drain, a residential garden, or even directly into a sewer line, are not suitable for various reasons. Storm drains are meant for surface runoff and are typically not equipped to handle wastewater, which can lead to environmental contamination. Disposing of wastewater in a residential garden can introduce pollutants into the soil and surrounding ecosystem, posing risks to plants and wildlife. Directly introducing wastewater back into a sewer line without proper treatment steps could also create backflow problems or overwhelm the treatment system. Therefore, the sewer line's structured process for handling wastewater makes it the best choice.