A composting toilet uses the least water per use because it typically requires little to no water for flushing. In LEED Water Efficiency, projects reduce indoor potable water demand by using high-efficiency fixtures and alternative technologies such as waterless urinals, composting toilets, low-flow faucets, and dual-flush water closets. Low-flow toilets and dual-flush water closets reduce water compared with conventional toilets, but they still use water. A conventional urinal generally uses more water than waterless or ultra-low-flow alternatives. Composting toilets also reduce wastewater generation and can support broader water conservation goals, although they require proper maintenance, code acceptance, and user education. LEED generally follows an efficiency-first approach: reduce demand first, then consider nonpotable or alternative water sources where appropriate.