马萨诸塞州水资源管理局（MWRA）从未经过滤的地表水源向大波士顿地区供水，该局根据《安全饮用水法案》对地表水处理规则（SWTR）进行了双轨监管。在对其系统需求进行全面审查并制定综合供水改善计划的同时，MWRA根据与州首要机构的行政许可令，规划和设计了过滤和非过滤处理技术。1998年，MWRA董事会决定将臭氧/氯胺化处理纳入新的处理厂后，美国环境保护局（USEPA）在联邦法院对这一决定提出质疑，称《安全饮用水法》要求过滤。经过全面审判后，美国联邦地区法院支持MWRA的计划，并发现该系统不需要过滤。美国卫生部对这一决定提出上诉，但在上诉悬而未决期间，MWRA继续执行其改善饮用水质量的计划。 该项目包括水源的流域保护、一个新的2.6亿美元的处理设施，包括臭氧消毒、有盖分配储存和管道修复，以及一个新的17.5英里的MetroWest供水隧道，为波士顿地区的单一输水管道提供冗余。包括6篇参考文献。

The Massachusetts Water Resources Authority (MWRA), which provides water fromunfiltered surface water sources to the Greater Boston area, pursued a dual trackfor compliance with the Surface Water Treatment Rule (SWTR) under the SafeDrinking Water Act. While undertaking a comprehensive review of its system needsand developing an integrated water supply improvement plan, MWRA planned anddesigned both filtration and non-filtration treatment technologies under anadministrative consent order with the state primacy agency. After the MWRA Boarddecided in 1998 to include ozonation/chloramination treatment in the newtreatment plant, the US Environmental Protection Agency (USEPA) challenged thisdecision in federal court, contending that filtration was required under the SafeDrinking Water Act. After a full trial, the US Federal District Court upheldMWRA's program and found that filtration was not required for the system. The UShas appealed this decision but, while the appeal is pending, the MWRA continuesto pursue its program for drinking water quality improvements. This programincludes watershed protection for the sources, a new $260 million treatmentfacility including ozonation disinfection, construction of covered distributionstorage, and pipeline rehabilitation, as well as a new 17.5 mile MetroWest WaterSupply Tunnel to provide redundancy for the single aqueduct now transmittingwater for the Boston area. Includes 6 references.