LEED Green Associate Practice Test

The correct answer is composed of waterless urinals and composting toilets, both of which effectively reduce indoor water use. Waterless urinals rely on gravity and a special trap to manage waste without the need for flushing, contributing significantly to reduced water usage. Composting toilets treat human waste through controlled biological processes, turning waste into compost without using water for flushing, thereby eliminating the need for water entirely in the process. The other choices include fixtures that do not entirely eliminate water usage. For example, dual-flush toilets do reduce water consumption by providing two flushing options (full and partial), but they still require water for each flush. Low-flow faucets also use less water but are not waterless since they still facilitate water flow. Thus, the combination of composting toilets and waterless urinals stands out as an effective approach to achieving significant water savings indoors, making the other options less effective in terms of total waterless operation.