Hydro excavation—also called hydrovac, vacuum excavation, or non-destructive digging—is a method of removing soil using pressurized water and an industrial vacuum system. It’s the safest, most precise excavation technology available today, and it’s rapidly replacing traditional mechanical digging for any project involving underground utilities.
This guide explains exactly how hydro excavation works, when to use it, what it costs, and why it has become the industry standard across Virginia.
How Hydro Excavation Works
The process is straightforward:
- Pressurized water is sprayed onto the soil surface through a handheld wand. The water pressure (typically 2,000-3,000 PSI) breaks up the soil into a slurry
- A powerful vacuum (up to 6,000 CFM) simultaneously suctions the soil slurry into a debris tank mounted on the hydrovac truck
- Underground utilities, pipes, and cables are exposed cleanly without any risk of damage because water cannot cut through steel, PVC, fiber optic cable, or other utility materials
- The debris tank is transported off-site for disposal, or the soil is deposited in an approved on-site location
For cold weather operations, the water can be heated to cut through frozen ground—a major advantage over mechanical methods in Virginia’s winter months (December through March).
Hydro Excavation Equipment
A modern hydrovac truck is a self-contained excavation unit that includes:
- Water tank: 1,000-1,200 gallons of fresh water (heated option for winter)
- Debris tank: 10-15 cubic yard capacity for excavated soil slurry
- Vacuum system: Industrial fan producing 5,000-6,000 CFM of suction
- Water pump: Delivers 2,000-3,000 PSI through the excavation wand
- Boom arm: 8-foot articulating boom positions the vacuum hose over the dig site
- Remote hose: Up to 600 feet of hose for reaching restricted-access areas where the truck can’t park directly adjacent
Common Uses for Hydro Excavation
Potholing & Daylighting
Creating small test holes (typically 12-18 inches in diameter) to physically expose and verify underground utility locations. This is required for VDOT SUE Level A verification and is the most common use of hydro excavation in Virginia.
Slot Trenching
Creating narrow, precise trenches for installing new pipes, cables, or conduit. Slot trenching is especially valuable for fiber optic installation where the trench needs to be only 6-8 inches wide.
Remote & Restricted Access Excavation
With up to 600 feet of hose reach, hydrovac trucks can excavate in locations that traditional equipment simply can’t access—backyards, between buildings, inside fenced compounds, and on steep hillsides. Beach HydroVac’s remote excavation service specializes in these challenging locations across Virginia.
Utility Repair & Maintenance
When a water main breaks, a gas leak is detected, or an electrical fault needs investigation, hydro excavation safely exposes the problem area without risking further damage to adjacent utilities.
Directional Drilling Support
Horizontal directional drilling (HDD) for fiber optic and utility installation requires entry and exit pits. Hydro excavation creates these pits safely, exposing any crossing utilities before the bore head reaches them.
Hydro Excavation vs. Traditional Methods
Traditional excavation with backhoes and trenchers costs less per hour ($150-$250) compared to hydro excavation ($300-$450/hour). But that comparison ignores the cost of utility strikes—averaging $4,000-$15,000 per incident in Virginia—plus project delays, OSHA fines, and liability claims. For a detailed comparison, see our guide: Hydro Excavation vs Traditional Excavation.
Who Uses Hydro Excavation in Virginia?
- Telecom contractors installing fiber optic networks for Cox, Verizon, and Lumen
- Electrical contractors working near Dominion Energy underground power lines
- General contractors doing site work near existing utilities
- Municipal utilities (HRSD, city water departments) repairing aging infrastructure
- VDOT and highway contractors requiring SUE Level A verification
- Gas companies locating and repairing distribution lines
- Military installations requiring non-destructive excavation on base
How Much Does Hydro Excavation Cost?
Virginia hydro excavation typically costs $300-$450 per hour or $250-$1,500 per pothole depending on depth and soil conditions. For complete pricing details, see our 2026 Hydro Excavation Cost Guide.
Get Started with Hydro Excavation
Beach HydroVac is a veteran-owned hydro excavation company based in Virginia Beach, serving Virginia, North Carolina, Maryland, and Delaware. We provide hydro excavation, potholing, slot trenching, remote excavation, and SUE Level A verification.
Call 757-510-5220 or contact us online for a free quote within 24 hours.