在1996年《安全饮用水法案》（SDWA）修正案通过之前，确定处理技术可行性的成本评估是基于区域和大城市供水系统将经历的影响。这种方法最初是在1974年的SDWA中确立的，并在1986年的SDWA修正案中保留。然而，适用于大型系统的可行技术可能不适用于小型系统。本文讨论了地表水处理规则中小型系统类别的处理技术。包括19个参考文献和表格。

Before the 1996 Safe Drinking Water Act (SDWA) amendments were passed, cost assessments to determine treatment technology feasibility were based on effects that would be experienced by regional and large metropolitan water systems. This approach was initially established in the 1974 SDWA and was retained in the 1986 SDWA amendments. However, feasible technologies for large systems may not be appropriate for small systems. This article discusses treatment technologies for categories of small systems for the Surface Water Treatment Rule. Includes 19 references, tables.