Which water type generally comprises treated wastewater that may be reused?

• A. Water Harvesting
• B. Surface Water
• C. Effluent Water
• D. Potable Water

Answer: (C)

Effluent water is the treated wastewater that leaves a treatment plant. After undergoing primary, secondary, and sometimes tertiary treatments, this water is often reused for non-potable purposes such as landscape or agricultural irrigation, toilet flushing, or industrial cooling, once it meets local safety standards. This makes it the type most commonly associated with treated wastewater that can be reused.

Water harvested from rainfall is collected rainwater and not wastewater. Surface water refers to natural bodies like rivers and lakes, not treated wastewater. Potable water is drinking water and undergoes additional treatment to ensure safety for consumption, rather than being the wastewater that’s recycled for reuse.