在过去的29年里，回收的废水一直被用于补充暴雨流量和补充洛杉矶中央盆地的进口水。再生水的使用已经实现了巨大的节约，现在每年的再生水补充量相当于25万人的用水需求。地下水质量绝对没有退化，间接饮用再生水的人的健康也没有受到任何可检测到的负面影响。如果能够成功地解决某些环境、工程、技术和监管方面的考虑，从而有助于缓解南加州日益严重的供水问题，洛杉矶和奥兰治县将有大量的进一步补充，可以利用再生水。本文概述了再生水的使用对供水、经济和水质的影响，重点介绍了水质。 利用再生水补充另外两个地区的地下水的潜力是存在的:圣加布里埃尔盆地上游和阿拉米托斯海水入侵屏障。

For over 29 years, reclaimed wastewater has been used to supplement storm flows and imported water in replenishing the Central Basin in Los Angeles. Substantial savings have been realized from the use of reclaimed water, and the quantity of reclaimed water now being recharged each year is equivalent to the water needs of a quarter of a million people. There has been absolutely no degradation of the groundwater quality, and the health of those people indirectly ingesting reclaimed water has not been adversely impacted in any detectable way. There is a significant amount of further replenishment that could utilize reclaimed water in Los Angeles and Orange Counties, if certain environmental, engineering, technical and regulatory considerations can be successfully addressed, thereby helping to alleviate the growing water supply problems in Southern California. This paper presents a broad overview of how this use of reclaimed water affects water supply, economics, and water quality, with most emphasis on water quality. The potential exists to use reclaimed water to replenish groundwater in two other areas: the Upper San Gabriel Basin and the Alamitos Seawater Intrusion Barrier.