本文的目的是为小型系统操作提供实施SWTR的关键指南。地表水是向大气开放的水，受地表径流的影响。SWTR涉及三类水:地下水；地表水；以及受地表水影响的地下水。SWTR将三类水分为两类。它们是需要过滤的和不需要过滤的。SWTR确实有一些标准，如果满足这些标准，将允许系统避免过滤。

The purpose of this paper is to present key guidelines to small system operations for the implementation of the SWTR. Surface water is water that is open to the atmosphere and is subject to runoff from the surface. The SWTR addresses three categories of water: groundwater; surface water; and groundwater under the influence of surface water. The SWTR recognizes two classes for the three categories of water. They are those requiring filtration and those which do not require filtration. The SWTR does have criteria which, if met, will allow systems to avoid filtration.