How is 'potable water' defined according to UPC?

The definition of 'potable water' according to the Uniform Plumbing Code (UPC) is specifically aimed at establishing the quality and safety of water that is suitable for human consumption. This means that potable water must meet certain health standards and regulations to ensure it is free from harmful contaminants that could pose risks to human health. This includes not just chemical pollutants, but also biological contaminants.

In contrast, the other options highlight different types or uses of water that do not meet the criteria for drinking. Industrial use, treated irrigation water, and water for washing are each designated for specific purposes and do not guarantee the safety necessary for consumption. Therefore, identifying water as potable strictly pertains to its applicability for drinking and cooking, which is accurately encapsulated by the second choice.