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No, and this catches people out constantly. Call Before You Dig in Connecticut, and Dig Safely New York on the other side of the state line in Westchester, are the 811 notification systems that get utilities to come mark their buried infrastructure before you excavate. Gas, electric, water, telecom. It's free, it's required before most digging, and it works well for what it covers. What it doesn't cover is the private sewer lateral running under your own property. That pipe belongs to you, no utility owns it, and nobody in the 811 system is responsible for finding it. So a homeowner who does everything right, calls 811, waits for the marks and starts digging, can still put a backhoe straight through their own sewer line. It happens regularly. If you're planning excavation, a patio, a pool, a driveway or tree removal, the sewer lateral is the one buried line you have to locate yourself.
What 811 Actually Marks
The 811 system notifies member utilities that someone intends to dig at a given address. Each utility then sends a locator to mark their own facilities with paint and flags, color coded by type. Yellow for gas, red for electric, blue for potable water, orange for telecom. Those marks cover the utility's own assets, which generally means everything from their main in the street up to the meter or the service point. It's a genuinely useful system and calling before you dig is the right first step. But every utility marks only what it owns, and no utility owns your sanitary sewer lateral. There's no green paint coming, because there's nobody whose job it is to bring it.
Why the Sewer Lateral Falls Through the Gap
The sewer lateral is unusual among buried lines because the property owner owns it outright. Your gas service belongs to the gas company. Your water service usually belongs to the water utility up to the meter. Your sewer lateral belongs to you from the foundation wall all the way to the municipal connection, and in most towns that includes the portion running under the sidewalk and the street. Since no utility owns it, no utility marks it. And since most properties have no drawing showing where it runs, the information simply doesn't exist anywhere until somebody goes out and traces it.
How a Private Sewer Locate Works
The method is straightforward. A small transmitter, called a sonde, goes into the line, usually riding in the head of a sewer camera. A receiver on the surface picks up that signal and follows it. The crew walks the route, marking it in paint on hard surfaces and flags on grass, and takes depth readings at points along the way. The result is a marked line on your property showing exactly where the pipe runs and how deep it sits. Most locates take about an hour. Because the sonde usually travels with the camera, a locate and a condition inspection often happen in the same visit.
When It's Worth Doing
Any excavation that reaches pipe depth is worth locating for first. New patio or driveway, pool installation, drainage work, a shed or addition foundation, fence posts, and tree removal, which people underestimate. Stump grinding and root ball extraction reach three feet down without much effort. It's also worth doing before a sewer repair, because marking the damaged section first means opening one part of the yard instead of trenching along the pipe to find it. On properties with mature landscaping or paved surfaces, that difference is usually far larger than the cost of the locate itself. The same applies before any repair on a line whose route nobody has ever recorded, which describes most older properties in this area.
