本幻灯片演示概述了加拿大安大略省为开发交叉连接控制程序所做的努力。最初的项目驱动程序涉及洗车厂和c市管道之间的交叉连接，导致19人住院，3万居民受到影响，纠正措施花费20万美元，洗车厂经理被罚款7.5万美元。成立了一个工作组，以评估和制定降低事故风险的概念和方案，并解决管辖权、成本和可用方法等问题。本演示列出了工作组感兴趣的利益相关者，并概述了工作组在收集现有项目信息和调查北美公用事业公司防回流实践方面所做的努力。 提供的数字包括:责任与合作；行动和执法；还有，项目成本。列出了这项工作的障碍，以及最佳实践的来源，包括:AWWA；加拿大标准协会；FCCCHR；和InfraGuide。包括数字。

This slide presentation outlines an effort in Ontario, Canada, to develop a cross connection control program. The initial program driver involved a cross connection between a car wash and c city's plumbing that resulted in 19 people being hospitalized, 30,000 residents being affected, corrective actions costing $200,000, and the manager of the car wash was fined $75,000. A working group was established to evaluate and develop concepts and options to reduce the risk of incidents, and address issues of jurisdiction, costs, and available approaches. The presentation lists the interested stakeholders of the working group, and outlines its efforts at gathering information on existing programs, and surveying North American utilities on their backflow prevention practices. Figures are provided for: responsibilities and cooperation; operation and enforcement; and, program costs. Obstacles to the effort are listed, along with sources for best practices that include: AWWA; Canadian Standards Association; FCCCHR; and InfraGuide. Includes figures.