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The Greywater Portal

Planted cattails at Millcreek greywater
Greywater, sometimes also spelled as graywater, grey water or gray water, is all of the effluent water from a household, such as water discharged from lavatories (bathroom sinks), bathtubs, showers, clothes washers, and laundry trays. Greywater is not wastewater from a sink used for food preparation, or water closet (toilet) wastewater.

The water leaving our homes carries nutrients and value. It may also contain pathogens, and/or harsh chemicals and care should be taken with it. However, it is not a great risk compared to blackwater (sewage).

Redirecting the water we use for tasks such as showering allows us to reclaim some of that value to grow plants and recharge the water table. It may be necessary to choose our soaps and detergents more carefully, if we use the greywater for watering and fertilizing plants.

Main portal: Water
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Cookhousemodel with tank wetland
Samoa Hostel Greywater Island. The Greywater Island project is a proposed greywater treatment system for the Samoa Cookhouse and Hostel. As part of the sustainable operations of the Hostel, the greywater island functions as the largest implemented greywater treatment system in the restored facility. The greywater system was specifically designed under a criterion that would fulfill California state water quality standards, generate optimal functional capacities and require minimal maintenance and cost. the implemented greywater system was rendered by means of a custom made sizing calculator and graphical models of the design.

The historic Samoa Cookhouse will be the new host of an alternative lodging hostel where guests can engage in educational modules and experience the features and functions of sustainable design. The renovation of the Samoa Cookhouse hostel became a collaborative project in which Humboldt Bay Center for Sustainable Living and Danco took part to exemplify the resourceful opportunities available by restoring available structures using sustainable principles.

Greywater without land. A five stage, activated sludge greywater system in drums.
Greywater without land. A five stage, activated sludge greywater system in drums. Read more or check our book
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Selected topics

AEF greywater · Emergent plants for constructed wetlands  · Greywater Ecuador La lagrima purificadora · Millcreek greywater · Occidental greywater · Samoa Hostel Greywater Island · Samoa Hostel Truth Tank · Subsurface flow constructed wetland for greywater
CCAT greywater
greywater grease trap · greywater marsh · greywater marsh problems · kitchen effluent particulate filter · Wash n Flush
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External resources

Interwiki links
  • Akvopedia - focused on water technologies.
  • WaterWiki.net - a UN sponsored wiki - most of the content indexes the work of UN agencies.

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