日益增长的城市化对公共社区供水系统有限的水源提出了巨大需求。为满足日益增长的需求，一项行之有效的保护措施是将废水回收用于不可移动的目的。再生水可用于景观和娱乐场地灌溉、工业流程、冷却塔、空调、烟气净化、厕所冲洗、建筑、消防和环境改善，如维护城市河流和湿地。 城市再利用需要双重分配系统，一个用于饮用水，另一个用于再生水。双系统特别适合于目前正在规划的城市发展，但即使对于必须进行改造的系统，它们也可以证明具有成本效益。这些经济来源于新水源和设施的收购和开发以及废水处理和处置方面的节约。由于不可移动的重复使用对公众健康的风险极小，公众接受度很高，甚至热情高涨。 对于寻求额外供水以满足未来需求的市政当局来说，不可转让的城市再利用是一个值得考虑的选择。包括29个参考文献、表格和图表。

Growing urbanization has put a heavy demand on limited sources of water for public community water supply systems. A proven conservation measure to help meet increasing demand is the reclamation of wastewater for nonpotable purposes. Reclaimed water can be used for landscape and recreational grounds irrigation, industrial processes, cooling towers, air conditioning, stack gas scrubbing, toilet flushing, construction, firefighting, and environmental enhancement such as maintaining urban stream flows and wetlands. Urban reuse requires dual distribution systems that use one system for potable water and another for reclaimed water. Dual systems are particularly appropriate for urban developments now being planned, but they can prove cost effective even for systems that must be retrofitted. The economies arise from savings in the acquisition and development of new water sources and facilities and in wastewater treatment and disposal. Because the public health risk from nonpotable reuse is minimal, public acceptance is high and even enthusiastic. Nonpotable urban reuse is an option worth consideration by municipalities seeking additional water supply to meet future needs. Includes 29 references, tables, figures.