圣安东尼奥大都会区的主要饮用水源是 爱德华兹含水层。由于该含水层受到越来越多的抽水限制，San 安东尼奥地区正在经历巨大的增长，圣安东尼奥供水系统 （SAWS）正在寻找补充和多样化其水资源的方法。什么之中的一个 这些努力是一个循环水项目。通过使用这种非饮用水用于 在灌溉、商业和工业应用方面，SAW已经能够储备更多 爱德华兹饮用水。 商业和工业暖通空调冷却塔被确定为 循环水（RW）。开放式循环蒸发冷却塔使用大量 水可以消散许多不同过程产生的热量。回收利用 冷却塔中的水节省了大量饮用水。 其中一个前景包括使用9000万吨的15000吨冷冻水设施 加仑的补给水。该设施由锯子操作，供应冷冻水 圣安东尼奥市中心的大部分地区，包括会议中心。 该设施于2003年被改造为循环水，SAWS的工作人员一直非常努力 对结果感到满意。没有迹象表明腐蚀加剧， 微生物问题、结垢或治疗费用增加。 许多其他设施已将冷却塔改造为RW，包括两家医院， 三个军事基地、几个宿舍、一个办公大楼和一个大型制造厂 设施

The primary source of drinking water for the San Antonio metropolitan area is the Edwards Aquifer. Since this aquifer is under increasing pumping restrictions and the San Antonio area is experiencing tremendous growth, the San Antonio Water Systems (SAWS) is looking for ways to supplement and diversify its water resources. One of these efforts is a recycled water program. By utilizing this non-potable water for use in irrigation, commercial and industrial applications, SAWS has been able to reserve more Edwards water for potable uses. Commercial and industrial HVAC cooling towers were identified as potential users of recycled water (RW). Open recirculating evaporative cooling towers use large amounts of water to dissipate heat generated by a number of different processes. The use of recycle water in cooling towers has resulted in a substantial amount of potable water savings. One of these prospects included a 15,000 ton chilled water facility that uses 90 million gallons of make-up water. This facility is operated by SAWS and supplies chilled water to much of downtown San Antonio including the Convention Center. This facility was converted to recycled water in 2003 and SAWS staff has been very satisfied with the results. There has been no indication of increased corrosion, microbiological problems, scaling, or an increase in treatment costs. Many other facilities have converted their cooling towers to RW including two hospitals, three military bases, several dormitories, an office complex, and a major manufacturing facility.