Hydro Excavation Services – Non-Destructive Digging for Civil and Infrastructure Projects

Underground infrastructure in New Zealand’s urban centres is increasingly congested. Power, fibre, water, gas, and telecoms assets frequently share the same corridor, and often without accurate as-built records. Mechanical excavation in these environments is a calculated gamble. TSL’s hydrovac service eliminates that risk.

High-pressure water cannot cut through live cables, pipes, or conduits the way a mechanical excavator can. Exposing utilities with hydro excavation means your team can see exactly what’s there before any further work proceeds, protecting your client’s infrastructure, your programme, and your liability position.

Hydro excavation is significantly faster than hand digging in sensitive areas, and often faster than mechanical excavation when you factor in the time lost to caution, service locating delays, and post-strike remediation. Our unit can pothole, trench, and expose services efficiently, keeping your project on programme.

Because hydro excavation removes only the soil that needs to move, excavation footprints are smaller and ground disturbance is minimised. That translates directly into reduced reinstatement costs – less surface to repair, less material to dispose of, and less disruption to surrounding infrastructure.

Our hydrovac unit can operate in environments that rule out conventional plant: narrow footpaths, live road corridors, rail corridors, congested intersection environments, and sites with height or access restrictions. If the space is tight or the risk is high, hydro excavation is often the only viable method.

TSL’s hydro excavation service is suited to a broad range of project types across civil, utility, and infrastructure sectors:

• Utility installation and maintenance – power, fibre, water, gas, and telecoms networks
• Civil infrastructure projects – roading, transport upgrades, and subdivision works
• Traffic signal and streetlight installation – potholing and service exposure ahead of pole and conduit installation
• Rail and transport corridor works – safe excavation in high-consequence environments
• Drainage and stormwater – trench excavation and pipe exposure without asset risk
• Pipeline and sewer works – slot trenching and service exposure for maintenance access
• Telecommunications and fibre rollouts – precise potholing in congested urban corridors
• Pole and piling installation – clean excavation for power poles and lighting infrastructure
• Emergency response – rapid mobilisation for urgent repair work around live services
• Archaeological and heritage-sensitive sites – low-impact excavation where ground disturbance must be controlled

By adding hydro excavation to our fleet, we’ve expanded our ability to deliver safe, efficient, and flexible project solutions across Auckland and beyond. Our experienced team understands the challenges of working in both urban and large-scale environments, and we’re committed to providing excavation services that protect assets, reduce risk, and save you time and money.

With TSL Group, you’ll have a trusted partner who puts safety, precision, and performance at the heart of every project. We also bring our own traffic management capability – meaning we can safely set up and manage the road corridor while the hydrovac work is underway, a practical advantage for utility and council clients working in live traffic environments.

Conventional mechanical excavation uses a steel bucket or auger that can’t distinguish between soil and the assets buried in it. Hydro excavation uses pressurised water, which breaks up soil but cannot damage live cables, pipes, or conduits. For work near known or suspected underground services, hydro excavation is significantly safer and often required under health and safety obligations.

Our hydrovac unit can expose services to within a few centimetres, making it suitable for service daylighting where precise asset location is needed before further work can proceed. For specific clearances applicable to your project type, contact our team.

Yes. It’s one of the most common applications. Our unit is well-suited to work in live traffic corridors, and TSL can provide integrated traffic management to safely control the road environment while excavation is underway.

Our hydrovac unit is designed to work in constrained environments. Hose extensions allow us to operate the vacuum at distance from the truck, giving us access to locations that larger plant cannot reach. Contact us to discuss your site-specific access requirements.