对两个饮用水分配系统（一个含有氯化地表水，另一个含有未氯化地下水）进行采样，以评估细菌计数的培养基和电镀技术。结果表明，在两种系统中，倾注平板法的细菌总数和着色细菌计数均不如扩散平板法。还讨论了氯含量波动的影响。包括13个参考文献、表格和图表。

Two drinking water distribution systems, one containing chlorinated surface water and the other unchlorinated groundwater, were sampled to evaluate media and plating techniques for bacterial enumeration. Results showed the pour plate method to be inferior to the spread plate method for the enumeration of total and pigmented bacteria in both systems. Effects of fluctuating chlorine levels are also discussed. Includes 13 references, tables, figure.