CSLB Class B General Contractor's License Practice Exam

Which of the following situations requires potable water?

1. Water being expelled from any fixture in the building

2. Building supply

3. Greywater

4. Reused water from laundry rooms

The correct answer is: Building supply

The requirement for potable water is essential in situations that involve water intended for human consumption, cooking, personal hygiene, and other domestic uses. In the context of building supply, the water provided must meet health and safety standards to ensure that it is safe for occupants. Potable water systems must be designed and maintained to deliver water that is free from contaminants and suitable for drinking and other activities involving direct human contact. In contrast, options that involve greywater or reused water from laundry rooms typically do not meet potable standards. Greywater, which is wastewater generated from household activities such as laundry, dishwashing, and bathing, is not considered safe for drinking without proper treatment. Reused water from laundry rooms often contains detergents and other chemicals, rendering it unsuitable for human consumption. Therefore, the only scenario that unequivocally demands potable water is the building supply, as it is essential for health standards and regulatory compliance.