作者认为，为每个单独的供水系统专门制定一项交叉连接条例是一个好项目的基石。如果基石不存在或薄弱，项目将反映这一点。供水商的工作变得非常困难、耗时且成本极高。

The author believes having a cross connection ordinance written specifically for each individual water system is the cornerstone of a good program. If the cornerstone is non-existent or weak, the program will reflect this. The water purveyor's job becomes very difficult, time-consuming and extremely costly.