Wastewater is reused into drinking water. Human waste, food scraps, oils, soaps, and chemicals are among the items included. We classify wastewater treatment as a water use because it is so closely linked to other water uses. Before being released back into the environment, much of the water consumed by homes, industries, and enterprises must be treated. Because it can have a detrimental effects to human health if the wastewater is properly untreated.