Which of the following can be a source of non-potable water?

Water from a swimming pool is considered a source of non-potable water because it is treated with chemicals such as chlorine to keep it clean and safe for swimming; however, it is not safe for human consumption. Non-potable water refers to water that is not suitable for drinking and is often used for purposes like irrigation, flushing toilets, or industrial processes. In contrast, rainwater can be collected and used for various purposes but typically needs to be treated before drinking. Tap water is treated for human consumption, making it potable, while well water can be potable if properly tested and treated but often needs assessment to determine its safety for drinking. Hence, water from a swimming pool is distinctly categorized as non-potable.