When you refer to “dip”–I assume you are speaking of a situation other than the natural slope of the line caused by movement of the pipe from its original placement(?). No doubt that the equipment for trechless line replacement is expensive—but does that translate into being more expensive to the customer as well? It is my understanding because there is less manual labor involved–the cost is 1/2 you would expect from a
conventional replacement job. Is this the reason “tenchless plumbers” are hard to locate in the Washington DC area?