What is considered greywater?

Greywater is defined as untreated household wastewater that doesn't include toilet waste. This encompasses water from sources such as sinks, showers, bathtubs, and washing machines, as long as it has not been contaminated with sewage. The primary benefit of collecting and using greywater lies in its potential for irrigation and other landscape uses, reducing the demand for potable water and promoting sustainable water management practices.

The term "greywater" is distinct from "blackwater," which refers specifically to wastewater that contains human waste, such as that from toilets. Greywater systems are designed to reuse this type of water safely, making everyday water use more efficient.

The other options narrow down the definition of greywater incorrectly or refer to specific types of wastewater rather than the broader category that includes all non-sewage household wastewater. This understanding is crucial for effectively managing water resources within landscape architecture and horticulture.