- Association of Metropolitan Sewerage Agencies
 - Representing the interests of the country's wastewater treatment agencies. - WateReuse Association
- The WateReuse Association is a nonprofit organisation working to promote the beneficial use of water resources using reclamation, recycling, reuse, and desalination.
- Water Recycling
- An ecological wastewater recycling system in Chatham County, NC; on-site treatment facility which not only purifies water and reclaims nutrients, but also reuses it.
- Texas On-Site Wastewater Treatment Research Council
- (AU) Water Recycle Group Australia
- The Water Recycle Group Australia works to provide solutions for practical water treatment by safe, clean, environmentally friendly methods.
- U.S. Environmental Protection Agency - Office of Wastewater Management@
- (AU) Recycled Water
- Information from Melbourne Water about recycling water.
- World-Wide Web Virtual Library: Wastewater Engineering
- Links to general resources, research institutions, trade and commercial organisations, and more.
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