本幻灯片演示首先询问有关管理分销系统不同部分的责任的问题。该演示说明，最终责任由供水商或供应商承担，并提供了不同类型配水系统污染百分比的饼图。它列出了AWWA认证或认可测试人员培训的部分，并指出只有17个州通过州机构认证回流测试人员，其余州允许通过营利或非营利组织认证回流测试人员。还提供了其他可接受的认证来源，以及美国卫生部对总大肠菌群规则的审查信息。 以及决定分配资源用于配电系统管理的重要性。

This slide presentation begins by asking questions about responsibility for managing different parts of a distribution system. The presentation states that final responsibility rests with the water supplier or purveyor, and provides a pie chart of percentages for different types of distribution system contamination. It lists the AWWA sections that certify or endorse tester training, and points out that only 17 states certify backflow testers through a state agency, and the balance of the states allow backflow testers to be certified through for-profit or non-profit organizations. Other acceptable sources of certification are provided, along with information on a review of the Total Coliform Rule by the U.S. Environmental Protection Agency, and the importance of deciding where to allocate resources for distribution system management.