Underground utility mapping is the process of identifying, locating, and documenting the position of buried utility infrastructure within a property or project area. Mapping can include underground water lines, sewer lines, electrical cables, gas lines, communication lines, drainage systems, and other subsurface utilities that may affect construction or excavation activities.

Professional underground utility mapping services combine field locating methods, specialized detection equipment, Ground Penetrating Radar (GPR), utility marking, and positioning technologies to develop a clearer representation of underground infrastructure. The collected information can be documented through utility maps, site drawings, coordinates, or digital mapping data for project planning and future reference.

Accurate utility mapping gives contractors, engineers, property owners, and developers better visibility into existing underground infrastructure before work begins. By documenting utility locations and routes, mapping can support safer excavation, improved construction planning, reduced utility damage risks, and more efficient project coordination.