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6.1.E. - Page 7 <br /> The County and Cities must diversify their water supply sources and reduce their residents' <br /> dependence on water from the Hetch Hetchy regional water system. Recycled water is one of the <br /> keys to reducing potable water use. Recycled water can augment water supplies, reduce the <br /> impacts and costs of wastewater disposal, and restore and improve sensitive natural <br /> environments. Water recycling would help the County and Cities realize the water conservation <br /> goals established in the California "20x2020 Water Conservation Plan," that requires urban <br /> water suppliers to reduce potable water use 20% by the year 2020.5 <br /> What is Recycled Water? <br /> Recycled water is wastewater(sewage) treated to remove solids and certain other impurities, <br /> such as metals and ammonia, so the water can be used in landscape irrigation and industrial <br /> processes, or to recharge groundwater aquifers. The term "recycled water" is synonymous with <br /> "reclaimed water" or "reused water." <br /> The Recycling Process <br /> Sanitary sewer systems in the County (Appendix A) deliver wastewater to treatment plants <br /> where it progresses through varying degrees of treatment. The end use will dictate whether the <br /> wastewater receives primary, secondary, or tertiary treatment and disinfection. (Appendix B) <br /> A dual piping network that keeps recycled water pipes completely separate from drinking water <br /> pipes distributes the recycled water to various end users.�Effective June 1, 1993, all pipes <br /> designed to carry recycled water must be purple, or wrapped in distinctive purple tape and <br /> labeled as recycled water.' <br /> Historical Use of Recycled Water <br /> Water recycling has been a part of California's water management plan for more than 100 years. <br /> In the early 1900s, partially treated wastewater and groundwater transformed San Francisco's <br /> Golden Gate Park from an area of sand and waste to a garden spot. In the 1930s, construction <br /> began on the McQueen Treatment Plant in Golden Gate Park to provide secondary-treated <br /> recycled water for park irrigation. This practice continued until 1978 when the McQueen plant <br /> stopped operating because it did not meet the new state standards for irrigation use.� <br /> 5 <br /> California State Water Resources Control Board-20x2020 Agency Team on Water Conservation, <br /> http://www.swrcb.ca.�ov/water issues/hot topics/20x2020/index.shtml(Dec. 19,2012). <br /> � <br /> Wikipedia-Reclaimed Water,http://en.wikipedia.or�/wiki/Reclaimed water(Dec. 19,2012). <br /> � <br /> "California Health Laws Related to Recycled Water", <br /> http://www.cdph.ca.�ov/certlic/drinkin�water/Documents/Rechar�e/Purplebookupdate6-O 1.PDF <br /> (Dec. 19,2012). <br /> s <br /> San Francisco Water-Recycled Water, http://www.sfwater.or�/index.aspx?pa�e=141 (Dec. 19,2012). <br /> 3 <br />