What is the major constituent of wastewater?

The major constituent of wastewater is water, which typically comprises about 95% of its total volume. This high water content is fundamental to the definition of wastewater, as it includes various dissolved and suspended substances that can originate from domestic, industrial, and agricultural sources.

While there may be solids, chemicals, and organic matter present in wastewater, water serves as the primary medium for transporting these constituents. Understanding that wastewater is primarily water helps emphasize the importance of adequate treatment methods to effectively address the various pollutants dissolved within it. Treatment processes often focus on reducing the concentrations of solids, chemicals, and organic materials, but the predominance of water is what dictates the overall characteristics and management of wastewater systems.