Indirect potable reuse involves introducing treated water into which environment before withdrawal?

Indirect potable reuse involves introducing treated water into which environment before withdrawal?

• A. Directly into the drinking water supply
• B. Water treatment facility effluent used for irrigation
• C. Groundwater or surface water
• D. Industrial cooling water

Answer: (C)

Indirect potable reuse relies on an environmental buffer by introducing treated water into groundwater or surface water before it is withdrawn for drinking water production. The water spends time in the natural environment, undergoing further attenuation and mixing, which helps ensure safety before it is treated again for potable use. This buffer distinguishes it from direct potable reuse, where treated water goes straight into the drinking water system without an environmental intermediary. Using the treated water for irrigation or industrial cooling would be non-potable reuse, not indirect potable reuse.

Indirect potable reuse relies on an environmental buffer by introducing treated water into groundwater or surface water before it is withdrawn for drinking water production. The water spends time in the natural environment, undergoing further attenuation and mixing, which helps ensure safety before it is treated again for potable use. This buffer distinguishes it from direct potable reuse, where treated water goes straight into the drinking water system without an environmental intermediary. Using the treated water for irrigation or industrial cooling would be non-potable reuse, not indirect potable reuse.