Hydro Excavation = Safe Excavation.  Dig the Safest Way. Use Hydrovac Excavation. Hydro Excavation, or Hydrovac Excavation is a method of excavation that combines pressurized water to cut and loosen soil with a high flow vacuum to quickly and safely remove material out of the excavation area. This method of excavation is non destructive compared to traditional means, allowing a crew to access an underground location without damaging utilities such as water, sewer, gas pipelines, electric, and fiber optic cables.