LEED Green Associate Practice Test

Which type of toilet is considered an efficient choice according to water use standards?

1. Standard flush toilet

2. Dual-flush toilet

3. Composting toilet

4. High-flow toilet

The correct answer is: Dual-flush toilet

A dual-flush toilet is considered an efficient choice according to water use standards because it offers two flushing options: one for liquid waste and another for solid waste. This design effectively reduces overall water usage compared to a standard flush toilet that uses the same amount of water regardless of the type of waste. The ability to choose a lower volume flush for liquid waste helps conserve water, promoting sustainable water management practices. The other types of toilets do not offer the same levels of efficiency. A standard flush toilet typically uses more water per flush than necessary, while a high-flow toilet is specifically designed for maximum flush volume, which is counterproductive to water-saving goals. Although composting toilets can be efficient in terms of water use since they do not require flush water, they function differently and may not be practical for all users or building types, which narrows their application compared to dual-flush options.