What percentage of sewage is approximately water?

Sewage typically contains a high percentage of water, which is essential for the transport of organic matter, bacteria, nutrients, and other contaminants. Approximately 75% of sewage is composed of water, which is why this answer is considered accurate. The predominance of water in sewage reflects its role as a solvent, enabling the effective movement and treatment of waste materials within wastewater systems.

The other options suggest significantly lower percentages, which do not accurately represent the typical composition of wastewater. For example, 25% and 50% would imply a much higher concentration of solids than what is generally observed in typical sewage systems. Although some contexts could indicate such lower figures, they do not reflect the average residential or municipal wastewater composition where the majority is indeed water. The extremely high figure of 99.9% would suggest almost entirely water, which is not realistic for any practical sewage system, as it would imply nearly no solids or contaminants, which is not reflective of real wastewater characteristics.