小型水系统在满足地表水处理规则的要求方面面临巨大困难。本文描述了俄勒冈州监管机构、社区和咨询工程师之间建立的合作关系，以帮助小型社区满足这些要求。以俄勒冈州Westfir的一个小社区为例，成功地安装了慢速砂滤，这已被证明是一种有效且合适的处理技术。还描述了州水项目工作人员开展的几个相关示范项目，以开发中试过滤器和设计指南，供未来项目使用。包括5个参考文献、表格、图表。

Small water systems face immense difficulties in meeting the requirements of the Surface Water Treatment Rule. This article describes partnerships formed between the state regulatory agency, communities, and consulting engineers in Oregon to assist small communities in meeting these requirements. A case study is presented of a small community, Westfir, Oregon, that successfully installed slow sand filtration, which has proved to be an effective and appropriate treatment technology. Also described are several associated demonstration projects undertaken by state water program staff to develop pilot filter and design guidelines for use in future projects. Includes 5 references, tables, figures.