What is defined as "greywater" in the plumbing code?

Greywater is defined in the plumbing code as wastewater that comes from sinks, showers, and washing machines, which may be collected and reused for various purposes, such as irrigation or toilet flushing. This definition highlights the distinction between different types of wastewater; greywater typically does not include water from toilets, which is classified as blackwater and requires more stringent treatment due to its higher levels of pathogens and contaminants.

By understanding greywater as a potential resource, municipalities and homeowners can implement sustainable practices that conserve freshwater and promote efficient water use. Greywater systems can reduce the volume of treated potable water used for non-potable applications, offering both environmental and economic benefits. The plumbing code outlines specific regulations regarding the collection, treatment, and use of greywater to ensure safe and effective practices are followed.

Other definitions, such as stormwater runoff from roofs or water used for irrigation, do not fit the criteria for greywater, as they pertain to entirely different water management practices in the plumbing code.