A word of caution is appropriate here. In several cities around the Los Angeles area and I can only assume the same is true for the rest of the country, the lateral pipe is considered a private pipe. Before you start selling sewers, call your local Dept. of Engineering located within the Dept. of Building and Safety and ask this important question: "Who is financially responsible for sewer lateral repairs?" Do not proceed until you have the answer. This is a critical piece of information and here's why. If you tell a customer that replacing their sewer from their house to the property line will absolutely solve the problem—look out! Suppose you replaced the sewer and then found the lateral to be an additional needed repair. Your promise to solve the problem at a fixed bid price may cost you thousands of dollars. The customer always assumes that their financial responsibility terminates at their property line—that may not be true, and that's my point. You may end up in court and chances are you'll lose.
The court's position is that you are the professional not the homeowner, and you should know better. If you can not inspect the lateral with your camera let your customer know that. Also, let them know that if a lateral repair is needed, they have to pay for it even though it is on public property. Reinforce this statement on your contract with the homeowner. Are you licensed to dig up the street? A plumber's contractors license is not sufficient. You may need to bring in a specialty contractor. A lateral repair usually costs between $1800 and $4000 for just the section under the parkway grass. Lateral repairs under the street start at $5000 and can be very costly under a high traffic street. You haven't lived until you've replaced a tough lateral under a busy street, 14ft deep in sandy soil that continually caves in and you couldn't use a backhoe because there is a myriad of main gas lines, water lines and telephone fiber-optic cables you need to weave through to get to your pipe—it happens!
I have been involved in several such residential lateral repairs that have cost homeowners in excess of $10,000. Arm yourself—no surprises for you or your customer. If you can't inspect a lateral with your camera before you break ground, never assume that it's O.K.. Cover your butt!
The juncture we needed to locate is denoted by the " ? " in the drawing below