Category:Greywater: Difference between revisions

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Introduction

Greywater, sometimes also spelled as graywater, grey water or gray water, is all of the effluent water from a household, except that which has touched a significant amount of poop, i.e. all water flowing out of a house except that from the toilets. In addition, if greywater is held for too long (>24 hours in temperate climates), it will become blackwater.^{[verification needed]}

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.

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Organizations

• Water Conservation Alliance of Southern Arizona

Projects

• The old greywater system at CCAT

Links

• Oasis Designs - The best common errors and best practices section ever.
• The EPA on water.
• Agroforestry on greywater for Trees and Landscape.
• http://www.greywater.com/ - Check out their pollution page.
• College of Agriculture and Home Economics New Mexico State University
• 3/29/07 LA Times article on Grey water's red tape
• The graywater guide book from January 1995 (pdf)
  • Focuses on Subsurface Drip Irrigation and Mini-Leachfield in California
• 1997 Revised California Graywater Standards (pdf)
  • Main changes:
  1. 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.
  2. One irrigation zone is now acceptable. Whereas before two were required.
  3. Filters are now sized based on filtration rate. Whereas before a 1 inch filter was prescribed.
• California Revised Greywater Code (html)
• Colorado State University - Greywater information
• Chapter 9 of the Humanure Handbook
  • Excellent resource. Punchline: 1 ${\displaystyle ft^{3}}$ of Constructed Wetland for every 1 gallon of graywater per day.

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