with Denver's high quality drinking water. Further, the projected cost was lower than estimates for obtaining distant new water supplies. Reclaimed water is not regulated by the U.S. Environmental Protection Agency (EPA), but the EPA has developed water reuse guidelines that were most recently updated in 2012. The EPA Guidelines for Water Reuse represents the international standard for best practices in water reuse. The document was developed under a Cooperative Research and Development Agreement between the EPA, the U.S. Agency for International Development (USAID), and the global consultancy CDM Smith. The Guidelines provide a framework for states to develop regulations that incorporate the best practices and address local requirements. Trade associations The WateReuse Association is a trade association in the United States which promotes reuse of water. According to their website, "The WateReuse Association is the nation's only trade association solely dedicated to advancing laws, policy, funding, and public acceptance of recycled water. WateReuse represents a coalition of utilities that recycle water, businesses that support the development of recycled water projects, and consumers of recycled water." The WateReuse Research Foundation was merged into the WateReuse Association on July 11, 2016. Other countries Canada: "Canadian guidelines for domestic reclaimed water for use in toilet and urinal flushing" (2010). China: China National Reclaimed Water Quality Standard; China National Standard GB/T 18920-2002, GB/T 19923-2005, GB/T 18921-2002, GB 20922-2007 and GB/T 19772-2005. Israel: Ministry of Health regulation (2005). Japan: National Institute for Land and Infrastructure Management: Report of the Microbial Water Quality Project on Treated Sewage and Reclaimed Wastewater (2008). Jordan: Jordanian technical base n. 893/2006 Jordan water reuse management Plan (policy). Mexico: Mexican Standard NOM-001-ECOL-1996 governing wastewater reuse in Agriculture. South Africa: The latest revision of the Water Services Act of 1997 relating to grey-water and treated effluent (Department of Water Affairs and Forestry, 2001). Tunisia: Standard for the use of treated wastewater in agriculture (NT 106-109 of 1989) and list of crops that can be irrigated with treated wastewater (Ministry of Agriculture, 1994). Australia National level Guidelines: Government of Australia (the Natural Resource Management Ministerial Council, the Environment Protection and Heritage Council, and the Australian Health Ministers Conference (NRMMC-EPHC-AHMC)): Guidelines for water recycling: managing health and environmental risks" Phase 1, 2006. History Wastewater reuse (planned or unplanned) is an ancient practice, which has been applied since the dawn of human history and is closely connected to the development of sanitation provision. Country