How is contaminated water classified?

Contaminated water is classified as not potable, meaning it is not safe for human consumption. This classification is due to the presence of harmful microorganisms, chemicals, or pollutants that can pose health risks if ingested. Potable water is defined as water that is safe to drink, typically meeting specific health and safety standards. Contaminated water fails to meet these criteria, which is why it is deemed unsuitable for consumption.

The other options imply some level of safety or potability which is misleading in the context of contaminated water. Therefore, understanding the classification of water based on its safety for consumption is crucial for health and safety assessments, especially in home inspections where water quality can directly affect the occupants' well-being.