Hydro Excavation Sydney
Expose live services with water, not a bucket
Hydro excavation uses pressurised water to break up the soil and a vacuum unit to lift it straight into a holding tank, so a buried pipe, cable or conduit is uncovered without a blade or tooth ever touching it. Locate & Map provides hydro excavation across Sydney Metro as part of our vacuum excavation service. It is faster in clay, compacted fill and the tighter soils common across western and south western Sydney. No mechanical bucket. No hand digging around a charged HV cable. Just a controlled hole where you need one.
The point of the hole is information. A locate tells you where a service most likely sits; exposing it proves where it is. Our crews work alongside our utility locating team, so every pothole is guided by a survey rather than a guess, and the true depth, size, material and offset of the service are recorded before the hole is backfilled. Our Locator Surveyors are CertLoc accredited.
What’s included in hydro excavation?
Locate Before We Dig
Our team marks the services with electromagnetic detection and ground penetrating radar before anything is opened up, so the hole goes where the service is.
Pressurised Water Excavation
High pressure water cuts the soil and the vacuum unit lifts it into the tank as slurry, which is carried off site. No mechanical bucket and no hand digging around live assets.
Measured, Not Estimated
We record the true depth, size, material and offset of every exposed service. That is Quality Level A under AS 5488: the service exposed and measured, the only level the standard treats as validated.
Reinstatement
Once the service is recorded, the hole is backfilled and made good, and the recorded data goes into your plan set so the site can keep working.
Data for Your Drawings
Verified depths and offsets go straight into our utility mapping and drafting output in 12d and AutoCAD, ready for your designers.
Hydro or air excavation: which suits your site?
We choose the method to suit the ground and the asset. Hydro excavation uses pressurised water to cut the soil, and it is faster in clay, compacted fill and the tighter soils common across western and south western Sydney. The spoil comes out as slurry and is carried off site in the tank.
Air excavation uses compressed air instead. The spoil stays dry, so it can go straight back into the hole. That suits sandy ground, jobs where the excavated material has to be reused, and places where introducing water is a problem, such as around sensitive electrical assets or inside a building.
Both methods are non-destructive. The difference is the ground, the reinstatement and what the asset owner will accept. Our vacuum excavation page covers both methods and the wider service.
Book hydro excavation across Sydney
Tell us what needs exposing, how deep, and which asset owners are involved, and we will scope the job. Our 24 hour service covers night works and tight construction timelines. Call (02) 8753 0049 or request a quote.
When do you need hydro excavation instead of a locate alone?
Electromagnetic and radar methods give a position and an estimated depth. That is enough to mark a site, but not always enough to dig beside. Where a design sits close to a service, or where a contractor needs to sign off on a clearance, potholing turns that estimate into a measured fact. Under AS 5488, exposing and measuring a service lifts it from Quality Level B, a detected position, to Quality Level A. That connection between the locate and the pothole is what turns a marked-up site into verified information you can put on a drawing.
The same applies where excavation has to happen inside the exclusion zone around charged electrical cables, gas mains, pressurised water or fibre, which often share the same corridors on Sydney sites. Designers also ask for potholes when a proposed alignment crosses an existing service and the clearance is tight, so they have the level, size and material before the design is locked in.
What can hydro excavation be used for on a Sydney site?
Beyond potholing to verify services, a vacuum unit can cut narrow trenches, service pits, sign and pole footings and tree pits where a machine cannot safely work or cannot fit. On residential, commercial, civil and industrial sites with live services in the way, it is the safe way to get down to them. We cover Sydney Metro from our Five Dock office.
The difference from mechanical digging is the risk. An excavator bucket can shear a 200 mm water main or nick a fibre bundle before the operator feels anything. Water will not.
What happens after the services are exposed?
Every job runs the same way. We scope what needs exposing, how deep and which asset owners are involved. We locate the services with electromagnetic detection and ground penetrating radar. The vacuum unit cuts the hole down to the asset. We measure the true depth, size, material and offset of the exposed service. Then the hole is backfilled and made good, and the data goes into your plan set.
Because locating, vacuum excavation, mapping and drafting run as one service, the numbers from the pothole travel straight to our drafters instead of getting lost between crews, which is the gap where most strikes happen.
On projects that need a complete record, potholed points become part of a subsurface utility engineering dataset, with a quality level and capture method attached to every utility.