南加州大都会水区通过制定行动计划应对三项法规:大肠菌群总量法规、地表水处理法规和消毒副产品法规，来应对日益严格的法规。行动计划的形成或内容没有给出细节。然而，也指出了优点:例如，MWD能够预测从游离氯转化为氯胺的问题，并且能够识别法规的重叠或冲突领域。MWD打算制定一些额外的行动计划，以应对其服务区域特有的其他法规和问题，如地震。

The Metropolitan Water District of Southern California responded to increasing regulation by forming action plans to deal with three of the regulations: total coliform rule, surface water treatment rule, and disinfection byproduct regulation. No details are given on the formation or content of the action plans. However, advantages are pointed out: for example, the MWD was able to anticipate problems with conversion from free chlorine to chloramine, and is able to identify overlapping or conflicting areas of the regulations. The MWD intends to form a number of additional action plans to deal with other regulations and problems unique to its service area, such as earthquake.