Graywater

Appendix G of the Uniform Plumbing Code (UPC) defines graywater as “untreated household wastewater which has not come into contact with toilet waste. Graywater includes water from bathtubs, showers, bathroom wash basins, and water from clothes-washer and laundry tubs. It shall not include wastewater from kitchen sinks or dishwashers.” The International Plumbing Code (IPC) defines graywater in its Appendix C as “wastewater discharged from lavatories, bathtubs, showers, clothes washers, and laundry sinks.” Some states and local authorities allow kitchen sink wastewater to be included in graywater. Other differences with the UPC and IPC definitions can be found in state and local codes. Project teams should comply with the graywater definitions as established by the authority having jurisdiction in their areas.

Mentioned in

References in periodicals archive

* In Maryland, SB 496 authorizes the use of graywater for residential purposes and requires the state to adopt regulations regarding graywater use.

Enacted 2018 State Environmental Health Legislation

The private sector also has a role to play in the shift toward unconventional water resources -- a role that must extend beyond current efforts to tap desalinated water and urban graywater and wastewater.

Meeting the world's demand for water, unconventionally

This was achieved through design of a rainwater collection and filtration system which sent graywater back to toilets, urinals and irrigation along with low-flow fixtures and timers on showers.

Performance based outcomes--a bookend approach project: Stone 34

There is also information on water conservation in the home, irrigation practices, graywater reuse, rainwater harvesting, sustainable wastewater systems, and active solar systems.

The Permaculture Transition Manual: A Comprehensive Guide to Resilient Living

Harvested rainwater from green roof and collected steam condensate are reused as graywater in the building and for truck washing.

New city sanitation complex ticks all the boxes with innovation, energy efficiency and wellness

Rainwater (roof run-off) and graywater (from tub, sink, or laundry but not toilets) can harbor bacteria and other contaminants.

Foods you should (and can) produce yourself and why

Model development for biotrickling filter treatment of graywater simulant and waste gas, Journal of Environmental Engineering 134(10): 813-825.

AERODYNAMIC RESISTANCE OF A BIOFILTER WITH A PACKING OF PINE CONES

One way to make this transition is through a graywater recycling system.

Where the water is flowing: new trends in plumbing technology

In fact, reusing your graywater may be the only way to keep your lawn and garden healthy without taking more than your fair share of the community's precious freshwater reserves.

Dear EarthTalk: I know that some large buildings filter some of their wastewater to irrigate exterior landscaping

"With deepening watering restrictions, there is increased risk of illegal cross connections." Austin's citizens might jury-rig "graywater" drains to their yards, "which carries health risks." And if watering did not continue, trees might die and home foundations would crack.

The big dry: a twenty-first century water war erupts in Texas

Strategies focusing on applying ICT to external environments and components of buildings, such as "B1 Intelligent vegetal wall system", "D2 Inductive shutter", "D3 Solar photoelectric glass", "D10 Solar-tracking light-guide plates", "D11 Smart roof light-guide system", and "H1 Intelligent graywater recycling system", are classified as "Attractive" attributes.

Applying a Kano quality model for intelligent green building design strategies in Taiwan

melanogaster; and Acadia Kopec - ReVOLTing Graywater: Can turbines placed in drains generate electricity from Graywater?

Focus on science; Wachusett students share their research