Effective utility marking requires a clearly defined work area, access to the property, and accurate information about the planned excavation or construction activity. Before locating begins, the site should be reasonably accessible so technicians can inspect the area, operate locating equipment, and mark detected underground utilities on the surface.

Technicians may use electromagnetic utility locators, Ground Penetrating Radar (GPR), utility records, site plans, and other locating methods to identify buried infrastructure. Available drawings or information about electrical lines, water pipes, sewer systems, communication cables, irrigation lines, and other utilities can help technicians better understand the site and determine where additional investigation may be needed.

Once utilities are identified, their approximate locations can be indicated using temporary paint, flags, stakes, or other appropriate surface markings. Site conditions, utility materials, depth, accessibility, and the quality of available records can affect locating results. Proper preparation and professional utility marking help reduce utility strikes, improve project planning, limit service disruptions, and support safer excavation and construction work.