耶尔姆市位于美国西雅图以南65英里处 宏伟的雷尼尔山的阴影。Yelm的草原土壤非常多孔，地下水位非常高 浅的Yelm从这片浅滩抽取饮用水 含水层20世纪80年代中期，常规测试显示硝酸盐 饮用水的浓度在上升。研究表明 硝酸盐来自高密度的化粪池沥滤 领域；土壤结构根本跟不上气候变化 它不再提供足够的治疗 在废水到达地下水之前。作为一个立即解决办法，该市建造了一个新的化粪池 泵系统和曝气泻湖处理设施，排放至 尼斯奎利河。为了保护这条原始的河流，这座城市进行了探索 停止向河流排放废水的方法。本文描述了 Yelm对这个问题的解决方案包括一个再生水湿地公园，一个州- 艺术的 处理设施和再生水分配系统。

The city of Yelm is located 65 miles south of Seattle, in the shadow of magnificent Mount Rainier. The prairie soils in Yelm are very porous and the groundwater table is quite shallow. Yelm draws its drinking water from this shallow aquifer. In the mid-l980s, routine testing revealed that nitrate levels were rising in the drinking water. Studies indicated the nitrates were coming from high densities of septic tank leach fields; the soil structure simply could not keep up with the densities, and it was no longer providing adequate treatment prior to the effluent reaching the groundwater. As an immediate fix, the City constructed a new Septic Tank Effluent Pump system and aerated lagoon treatment facility that discharged to the Nisqually River. In an effort to protect this pristine river, the City explored ways in which to stop discharging wastewater into the river. This paper describes Yelm's solution to this problem which includes a reclaimed water wetland park, a state-of-the-art treatment facility and a reclaimed water distribution system.