Wastewater is the same as:

Wastewater refers specifically to water that has been used in homes, industries, or businesses and is considered contaminated or not pure anymore. This typically includes water from toilets, sinks, and industrial processes. Sewage, which is the correct choice, is a term that describes the liquid waste and effluent that is transported through sewer systems and wastewater treatment plants.

Sewage includes organic matter, chemicals, and pathogens, making it a significant subject in wastewater management. By understanding that sewage is a key component of wastewater, one can appreciate the complexities involved in collecting, treating, and disposing of this water safely.

Rain, condensation, and runoff all pertain to water in different states or contexts. Rain is precipitation, condensation is the conversion of vapor to liquid, and runoff refers to water, often from precipitation, that flows over land and may not necessarily be contaminated. These distinctions are crucial for wastewater treatment professionals, as they navigate the various sources and types of water they deal with in their work.