Utility marking is the process of identifying and clearly marking the location and approximate path of underground utility lines on the ground before excavation, drilling, trenching, or construction. Depending on the project, marked utilities may include electric, gas, water, sewer, telecommunications, and other buried infrastructure. Professional marking provides field crews with visible reference points so they can better understand where underground utilities are located.

Utility marking typically follows underground utility locating and detection. Technicians use appropriate locating equipment and available site information to trace utility routes and then place visible markings, flags, or other approved indicators on the surface. The marking process helps communicate the approximate horizontal location and route of detected utilities, although markings should not be treated as an exact representation of utility depth or a guarantee that every underground feature has been identified.

For projects throughout New Hampshire, professional utility marking can support construction, excavation, landscaping, roadwork, site development, and infrastructure projects. Utility Locating & Mapping New Hampshire can combine utility marking with Private Utility Locating, GPR Scanning, Underground Utility Mapping, Concrete Scanning, and GPS/GIS Mapping to provide more complete subsurface information and help project teams plan excavation work more effectively.