Which describes the difference between graywater and blackwater?

Graywater includes wastewater from lavatory faucets, whereas blackwater includes wastewater from toilets and urinals. This describes the difference between graywater and blackwater according to LEED. Graywater is wastewater that has been used for non-potable purposes, such as washing hands or dishes, but does not contain human or animal waste. Blackwater is wastewater that has been contaminated with human or animal waste from toilets or urinals. Graywater can be reused for certain purposes after minimal treatment, such as irrigation or toilet flushing, whereas blackwater requires more advanced treatment before reuse or disposal. The LEED Green Associate Candidate Handbook states that one of the strategies for achieving water efficiency is to “use non-potable water (graywater) for sewage conveyance” [1, p. 14]. References: LEED Green Associate Candidate Handbook, [Graywater vs Blackwater | U.S. Environmental Protection Agency]