Which of the following is NOT considered hazardous waste?

Clean drinking water is not considered hazardous waste because it is a resource that is essential for health and well-being. Hazardous waste typically poses a risk to human health or the environment due to its properties, such as being toxic, flammable, reactive, or corrosive. In contrast, clean drinking water does not possess these harmful characteristics and is required for safe consumption and daily activities.

The other options, such as used motor oil, leftover paint, and spent batteries, all have properties that can be hazardous to the environment or human health, making them classified as hazardous waste. Used motor oil can contain harmful contaminants, leftover paint may contain toxic substances like heavy metals, and spent batteries can leak harmful chemicals if not disposed of properly. Thus, clean drinking water stands out as a non-hazardous substance in this context.