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| summary = Greywater is household wastewater, excluding toilet waste. It consists of water, nutrients, toxins and pathogens. With suitable management, it can be a valuable resource.
==Introduction==
| topic = Greywater
Greywater, sometimes also spelled as '''graywater''', '''grey water''' or '''gray water''', is all of the effluent water from a household, except that from the [[Toilet design|toilet]]s, which is sometimes called "blackwater". In addition, if greywater is held for too long (>24 hours in temperate climates), it will become blackwater.{{fact}}
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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]]).
[[Category:Wastewater]]
 
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 [[soap]]s and [[detergent]]s more carefully, if we use the greywater for watering and fertilizing plants.
 
==Tips on how to minimize health risks associated with greywater==
* Wash yourself after contacting greywater.
* Install signage around greywater [[irrigation]] systems or areas.
* Do not drink or play with greywater.
* Do not allow anything that may be eaten to come into contact with greywater.
* Do not allow greywater to pond or run off the property.
* Do not wash domestic [[pets]] in greywater or allow pets to drink greywater.
* Do not use greywater in public places such as children's play areas or playgrounds, BBQ areas or recreation facilities.
==Suggested projects==
* What is the effect of various detergents and soaps in a greywater system? Consider the receiving soil and plant types - the answer may vary.{{sp}}
 
==Organizations==
*[http://watercasa.org/graywaterharvesting.php Water Conservation Alliance of Southern Arizona]
 
==Projects==
*The old [http://www.humboldt.edu/~ccat/waterconservation/marsh/index.html greywater] system at [[:Category:CCAT|CCAT]]
 
==Interwiki links==
* [[Greenlivingpedia:Knoxfield house#Greywater System|Knoxfield greywater system]] - application of greywater treatment in a house in Knoxfield, in the suburbs of [[Melbourne]], [[Australia]]. - ''Greenlivingpedia''
 
==External links==
*[http://www.graywater.net/ Oasis Designs] - The best [http://www.oasisdesign.net/greywater/misinfo/index.htm common errors and best practices] section ever.
*The [http://epa.gov/water/ EPA] on water.
*[http://agroforestry.net/overstory/overstory99.html Agroforestry] on greywater for Trees and Landscape.
*http://www.greywater.com/ - Check out their [http://www.greywater.com/pollution.htm pollution] page.
*[http://cahe.nmsu.edu/pubs/_m/m-106.html College of Agriculture and Home Economics New Mexico State University]
*[http://www.latimes.com/features/home/la-hm-graywater29mar29,0,7773709.story 3/29/07 LA Times article on Grey water's red tape]
*[http://www.owue.water.ca.gov/docs/graywater_guide_book.pdf The graywater guide book from January 1995 (pdf)] 
**Focuses on Subsurface Drip Irrigation and Mini-Leachfield in California
*[http://www.owue.water.ca.gov/docs/Revised_Graywater_Standards.pdf 1997 Revised California Graywater Standards (pdf)] 
**Main changes:
*#Use in commercial, industrial and multifamily projects is now acceptable  (and procedures for estimating discharge in those environments are now included). Whereas before only single family homes were allowed.
*#One irrigation zone is now acceptable.  Whereas before two were required.
*#Filters are now sized based on filtration rate.  Whereas before a 1 inch filter was prescribed.
*[http://www.p2pays.org/ref/18/17818.htm California Revised Greywater Code (html)]
*[http://www.ext.colostate.edu/pubs/natres/06702.html Colorado State University - Greywater information]
*[http://weblife.org/humanure/chapter9.html Chapter 9 of the Humanure Handbook]
**Excellent resource.  Punchline: 1 <math>ft^3</math> of Constructed Wetland for every 1 gallon of graywater per day. This must be with a maximum two foot depth, especially considering that Oasis Design states 1/2 to 1 square foot for every 1 gallon of graywater per day.
*[http://www.p2pays.org/ref/12/11609.pdf Texas A&M Greywater]
**Great pictures
 
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{{Topicadmin|Lonny}}
 
[[Category:Water]]
[[Category:Sewage]]
[[Category:Sewage]]

Revision as of 07:56, 29 July 2010

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