What could be an example of wastewater?

Wastewater is typically defined as water that has been used and is no longer suitable for its original purpose, mainly due to contamination. The liquid waste that comes from a toilet is a clear example of wastewater because it contains human waste and other contaminants, making it no longer safe for direct use or consumption. This type of wastewater requires treatment before it can be released back into the environment or repurposed for other uses.

Clean drinking water, on the other hand, is not wastewater because it is free from contaminants and suitable for consumption. Pesticide runoff, while it does involve liquid waste, refers specifically to agricultural chemicals that may contaminate water sources but is not classified as wastewater in the same way as sewage. Stormwater drainage may involve rainwater or melted snow but is not inherently considered wastewater unless it collects various pollutants along its pathway. Thus, liquid waste from a toilet most accurately represents the typical definition of wastewater.