What is the difference between hydrovac and air-vac?

Hydrovac uses 2,000-3,000 psi water plus a vacuum hose. Air-vac uses compressed air. Hydrovac is faster in clay and most GTA soils. Air-vac produces dry spoil and is preferred around bare energized electrical where water introduces shock risk. Air-vac costs more per hour.

Hydro Excavation Cost Toronto & GTA 2026: Daylighting Utilities Without the Damage

OCM Excavation coordinates hydrovac work across Toronto and the GTA every week. The honest 2026 hydro excavation cost Toronto picture: a 3-axle hydrovac truck with a 2-person crew runs $350 to $650 per hour, a 4-hour half-day minimum lands at $1,400 to $2,400, and a full day with dumping fees included sits at $2,800 to $4,500. Per-hole daylighting (one test pit, 1 ft diameter, 4 to 6 ft deep) is typically quoted at $300 to $700 per hole on flat-rate small jobs. Locate-required dig in the GTA? Call 416-317-3090 or request a free quote online and we will coordinate the hydrovac partner for you.

What Hydro Excavation Actually Is

Hydro excavation (also called hydrovac, vacuum excavation, or soft dig) is a non-mechanical dig method. A truck-mounted boiler pumps water at 2,000 to 3,000 psi through a hand-held wand. The water breaks up soil. A high-volume vacuum hose, 6 to 8 inches in diameter, sucks the resulting slurry into a holding tank on the truck. No blade, no bucket, no auger touches the ground. The wand operator can stop, redirect, and feel resistance the moment the water meets a pipe or cable.

This is not the same as augering or post-hole drilling. An auger spins a steel flight and will shear through a fibre-optic line in a quarter-second. Hydrovac will not. The water hits the cable, the wand operator feels the change, work stops, and the line stays intact. That is the whole reason hydrovac exists. See our trenching and post-drilling services page for the mechanical alternative, which has its place when there are no live utilities in the dig zone.

When Hydrovac Is Required (Not Optional)

Hydrovac is not a premium service. On the following jobs it is the only legal and safe method:

Within 1 metre of any Enbridge gas main: Enbridge Tolerance Zone rules require hand-dig or hydrovac. No mechanical excavation. After the 2017 Bloor Street gas-main strike, Enbridge enforcement on Toronto downtown jobs is strict.
Within 30 cm of marked fibre-optic lines: Bell, Rogers, and the fibre carriers all require hydrovac confirmation on the locate ticket. A nicked fibre line in a Markham backbone corridor can carry a six-figure repair invoice plus liability.
Around live electrical conduit: Toronto Hydro and Alectra Utilities flag any dig within their tolerance zone as hydrovac-only.
Congested downtown utility corridors: downtown Toronto streets stack water, gas, hydro, telecom, and steam services in a few feet of vertical space. Mechanical dig there is not an option.
Locate-ticket conditions that say so: if Ontario One Call returns a locate with hydrovac requirements written on the ticket, that ticket is the legal record. Skipping it is a Bill 93 violation.

Cost Breakdown: Why Hourly Rates Vary by $300

The $350-to-$650 hourly spread is not random. Four variables move the number:

Truck size and tank capacity: a small 6-yard hydrovac is cheaper per hour but fills up faster. On a big job, a 12 or 14-yard truck runs more per hour but spends less time driving back to the dump.
Disposal fees built in or extra: some operators bake disposal into the hourly rate; others charge $60 to $140 per cubic yard hauled. Clean wash water can sometimes settle on site; contaminated material (Reg 406/19 Table 1 or higher) runs $200 to $450 per cubic yard at a registered facility.
Water source: a hydrovac truck holds 1,500 to 3,000 litres of water. On a long dig with no on-site hydrant access, the truck has to leave and refill. Refill trips cost time and that time is billed.
Mobilization and minimum charge: almost every GTA hydrovac runs a 4-hour minimum. A 30-minute daylighting hole still costs 4 hours unless you stack multiple jobs on the same truck visit.

When OCM quotes a job that needs hydrovac, we break the line out: truck and crew hourly, expected hours on site, disposal volume estimate, and water-fill assumptions. If a quote you receive bundles everything into one number with no breakdown, ask for the per-hour rate and the disposal handling separately.

Hydrovac vs Hand-Dig vs Air-Vac: When Each Wins

Three soft-dig methods, three honest use cases. Hydrovac is the fastest soft method for most GTA soils (clay, loam, mixed fill). Water cuts through fill and clay quickly. Hand-dig with a shovel and a spotter is cheaper on a single small hole if no truck mobilization is needed, but it is slow and physically punishing past a few feet of depth. Air-vac uses compressed air instead of water. It produces dry spoil (lighter disposal, can sometimes be reused as backfill on site) and is preferred around exposed bare conductors where water introduces a shock risk. Air-vac is slower than hydrovac in clay and costs more per hour.

Honest rule of thumb: if the job is bigger than two test pits and the soil is GTA clay, hydrovac wins on total cost. If the job is one shallow hole and there is no live electrical, hand-dig wins. If the job touches bare energized conductors, air-vac wins regardless of cost. We tell you which one fits your dig before quoting.

Toronto and GTA Utility-Strike Compliance

The legal framework for any dig in Ontario, hydrovac included:

Ontario One Call is mandatory. Submit at ontarioonecall.ca or 1-800-400-2255, five business days before any dig. Free for the requester. Skipping a locate triggers Bill 93 fines starting at $10,000 per occurrence under the Underground Infrastructure Notification System Act.
Locate paint must be respected for the life of the ticket. Standard ticket is valid 30 days. After expiry, you re-request.
Enbridge Tolerance Zone rules (see Enbridge Damage Prevention Standards) require hand-dig or hydrovac within 1 metre of any gas main. The 2017 Bloor Street incident is why this is enforced hard in downtown Toronto.
Ontario Reg 213/91 (Construction Projects) applies to all excavation deeper than 1.2 metres, regardless of method. Shoring, sloped sides, or a P.Eng-stamped design for trenches deeper than 6 metres. Hydrovac does not exempt the trench from shoring rules.
Canadian Common Ground Alliance best practices (commongroundalliance.ca) set the industry baseline for damage prevention; locator paint colours, ticket handling, and hot-zone rules all trace back to CCGA.

One more piece: slurry disposal. Wash water and excavated material hauled off site must follow Ontario Reg 406/19 Excess Soil Standards. Non-contaminated wash water can often be settled on site or trucked to a registered facility. Contaminated material (Table 1 or above) needs a registered facility and a tracked manifest. A quote that does not address disposal is incomplete.

How to Get an Honest Hydrovac Quote in the GTA

Five questions to ask any hydrovac operator quoting your job:

What is the hourly rate, and what does it include? Truck, crew, fuel, water, disposal? Get it itemized.
What is your minimum charge? 4 hours is standard. Anything less is unusual; anything more is negotiable.
How is disposal handled? Per cubic yard? Bundled? What is the assumed volume? What happens if we exceed it?
Do you carry locate-strike insurance? Required. If they pause, walk away.
Can you provide the operator name and DZ licence on the locate ticket? The operator on site needs to match the ticket.

OCM does not own a hydrovac truck. We coordinate with vetted GTA partners and pass the cost through with full transparency on hours, disposal, and partner rate. That is cheaper for the homeowner than booking a hydrovac directly without a general contractor managing the locate, the dig sequence, and the restoration. See our full excavation services overview for how hydrovac fits into a larger site scope, and our utility trenching cost guide for jobs where hydrovac is one step in a longer trench.

City-Specific Notes

Toronto: Enbridge mandates hydrovac within 1 m of any gas main, and downtown jobs almost always need it because of utility congestion. See our Toronto page.

Vaughan: newer subdivisions have less utility congestion and can sometimes hand-dig safely if the locate clears it; hydrovac is still required within tolerance zones. Vaughan page.

Richmond Hill: Region of York rules on bored utility crossings under arterials drive a lot of the hydrovac demand here. Richmond Hill page.

Markham: fibre-optic backbone runs deep through the new construction zones, and hydrovac is required for any work within 30 cm of marked fibre. Bell and Rogers both enforce.

Mississauga: Enbridge, Alectra Utilities, and Bell all require hydrovac confirmation on the locate ticket for tolerance-zone work. Mississauga page.

Frequently Asked Questions

When is hydro excavation mandatory in Toronto?

Hydrovac is mandatory within 1 metre of any Enbridge gas main, within 30 cm of marked fibre-optic lines (Bell, Rogers), and within the tolerance zones marked by Toronto Hydro and Alectra Utilities on the locate ticket. If the Ontario One Call locate returns a ticket with hydrovac requirements, that is the legal record. Mechanical excavation in those zones is a Bill 93 violation with fines starting at $10,000 per occurrence and full liability for any strike damage.

How deep can a hydrovac dig?

A standard GTA hydrovac truck digs effectively to about 6 metres (20 ft) with a hose extension. Past that, suction drops and the spoil column gets unstable. Most utility daylighting holes are 1 to 3 metres deep. Trenches deeper than 1.2 metres still need shoring or sloped sides under Ontario Reg 213/91 regardless of the dig method. Hydrovac speeds the digging but does not exempt the trench from MOL shoring rules.

What’s the difference between hydrovac and air-vac?

Hydrovac uses high-pressure water (2,000 to 3,000 psi) to break up soil and a vacuum hose to suck the slurry into a tank. Air-vac uses compressed air instead of water. Hydrovac is faster in clay and most GTA soils. Air-vac produces dry spoil that can sometimes be reused as backfill on site and is preferred around bare energized electrical where water introduces shock risk. Air-vac costs more per hour and is slower in clay-heavy soil.

Do I need to provide water on site?

A hydrovac truck arrives with 1,500 to 3,000 litres on board. For a small daylight job, that is enough. For a longer dig, the truck either refills from an on-site hydrant (city permit required in Toronto for hydrant use) or drives to a refill point. Refill time is billed at the hourly rate. If you can provide hydrant access, the dig is faster and cheaper. Confirm with the operator before the truck arrives.

Where does the slurry go after the dig?

Non-contaminated slurry can sometimes settle on site in a temporary basin and the wash water released to grade, but most GTA jobs require hauling to a registered facility under Ontario Reg 406/19 Excess Soil Standards. Disposal runs $60 to $140 per cubic yard for clean material and $200 to $450 per cubic yard for contaminated material at a registered facility. Disposal is tracked on a manifest. Always ask how your contractor handles slurry before signing.

Is hydro excavation safe near live electrical?

Hydrovac is safe around insulated electrical conduit and is the required method within Toronto Hydro and Alectra tolerance zones. Around exposed bare energized conductors, the industry standard is air-vac, because water can carry current. The operator confirms the electrical condition on the locate ticket before starting. If bare conductors are exposed during the dig, work stops and the utility is called. A reputable hydrovac operator will never push water at an exposed conductor.

Ready to Dig the Right Way?

Call 416-317-3090 or request a free quote online. We coordinate hydrovac across Toronto, Vaughan, Richmond Hill, Markham, and Mississauga, and we build the locate, the dig, and the restoration into one quote. Related guides: utility trenching cost and site preparation cost.