Vacuum & Combo Vac Trucks: Buyer’s Guide | Supply Post

Sep 25, 2026 - an hour ago

Vacuum trucks do some of the hardest work on industrial, municipal and construction sites. They remove liquids, sludge and debris; support sewer and catch-basin maintenance; clean tanks and industrial facilities; and help crews manage material that ordinary equipment cannot handle. Add a high-pressure water system and the truck becomes a combo vac—one machine that can loosen material and vacuum it away.

That versatility also makes the buying process more detailed. Tank capacity alone does not tell you whether a truck is right for hydro excavation, sewer cleaning, septic work or dry-material recovery. The blower, water system, axle configuration, legal payload, hose and boom setup, condition and service history all matter.

Browse vacuum and combo vac trucks for sale on Supply Post to compare current new and used listings across Canada.

2019 Peterbilt 348 combo hydrovac truck listed on Supply Post — *A 2019 Peterbilt 348 tandem hydrovac listing. Inventory and availability can change; view the current listing for the latest details.*

What is a vacuum truck?

A vacuum truck uses a pump or blower to create suction and move material through a hose into a debris tank. Depending on the system and how the unit is configured, it may be used for wet or dry material, including liquids, slurry, sludge, soil, gravel and industrial debris.

Common applications include:

Septic and grease-trap service
Catch-basin and sewer cleaning
Industrial tank and facility cleanup
Oilfield and environmental work
Spill recovery
Non-destructive digging and utility exposure when paired with suitable excavation equipment

Because applications differ, “vacuum truck” is a broad category. A septic unit built mainly for liquid waste and a heavy industrial vacuum loader may share the same category name, yet have very different tanks, airflow, filtration and payload requirements.

What is a combo vac truck?

A combo vac truck combines vacuum recovery with a high-pressure water system. The water breaks up compacted soil, clears blocked lines or washes material from a work area; the vacuum system then collects the loosened material in the debris tank.

Combo units are commonly used for hydrovac excavation, daylighting utilities, sewer and culvert cleaning, catch-basin maintenance and industrial cleaning. They can reduce the need to move multiple specialized machines between jobs, but that capability adds components that need inspection and maintenance: water tanks, pumps, boilers or water heaters, hose reels, controls and winterization systems.

Vacuum truck vs. combo vac truck

Primary job: A vacuum truck recovers liquids, sludge or debris. A combo vac truck loosens material with water and then recovers it.
Water system: A vacuum truck may have a limited water system or none at all. High-pressure water is a core feature of a combo vac truck.
Typical work: Vacuum trucks commonly handle septic service, liquid recovery and industrial cleanup. Combo vac trucks are frequently used for hydro excavation, sewer cleaning and utility exposure.
Equipment complexity: Vacuum trucks generally have fewer water-system components. Combo units add pumps, tanks, hoses, controls and winterization requirements.
Best fit: Choose a vacuum truck when suction and transport are the main requirements. Consider a combo vac when crews also need washing, line cleaning or excavation capability.

The best choice starts with the work cycle. A business focused on septic pumping may gain little from a large high-pressure water package. A utility contractor may consider that same package essential.

Seven specs to compare before buying

1. Blower or vacuum system

Airflow and vacuum capability affect how quickly and from how far the truck can recover material. Ask what material the system was designed to handle, whether filtration is appropriate for wet or dry work, and how hose length and lift will affect real-world performance. Review blower hours separately from chassis kilometres when those figures are available.

2. Debris and water capacity

More capacity can mean fewer disposal or refill trips, but it also adds weight. Compare tank size with the density of the material you expect to carry, the truck’s axle ratings and applicable road limits. On a combo unit, the balance between fresh-water and debris capacity should match the job cycle.

3. Water pressure, flow and heating

For hydro excavation or line cleaning, check both pressure and flow—not just the larger number in the specification sheet. Confirm that the pump, hose, nozzles and heater are suited to the intended work. In colder regions, inspect the boiler or water-heating system and ask how the unit is drained and winterized.

4. Chassis, axles and payload

Tank and body specifications must work with the chassis. Review gross vehicle weight ratings, axle capacities, suspension, wheelbase, steering configuration and the expected loaded weight. A legal payload calculation is more useful than tank volume on its own.

5. Boom, hose and controls

Check boom reach and movement, hose diameter and condition, reel operation, remote controls, emergency stops and the operator’s sightlines. Think about the spaces where the truck will work: roadside access, tight urban sites and remote industrial locations create different needs.

6. Unloading and debris handling

Determine how the tank unloads, how easily it can be cleaned and whether the rear door, locks, seals and hydraulic systems operate correctly. Inspect the tank interior for corrosion, abrasion, residue and repairs. Confirm the tank and its documentation are suitable for the material you plan to haul.

7. Cold-weather readiness

Canadian operation can expose water lines, valves and pumps to freezing conditions. Look for insulated or heated cabinets, effective drain points, recirculation and a practical winterization procedure. A system that performs well in summer can lose valuable uptime if it is difficult to protect overnight.

2018 Kenworth T800 industrial vacuum truck listed on Supply Post — *A 2018 Kenworth T800 vacuum truck listing.*

How to inspect a used vacuum truck

A used unit should be evaluated as both a truck and a working vacuum system. Start with available maintenance records, then arrange an inspection and an operational demonstration appropriate to the machine.

Use this checklist to guide the conversation:

Chassis: Review engine, transmission, emissions system, brakes, suspension, frame, steering, tyres, kilometres and chassis hours.
Tank: Look for corrosion, cracking, abrasion, leaks, damaged baffles, poor repairs and seal wear.
Blower and filtration: Listen for abnormal noise, check oil and service history, inspect filters and separators, and test the system under load where practical.
Hydraulics and PTO: Check for leaks, heat, vibration and smooth operation of the boom, tank, rear door and hose reel.
Water system: Test the pump, heater, valves, reels, nozzles and pressure controls. Look for freeze damage and scale buildup.
Safety systems: Verify alarms, interlocks, emergency stops, lighting, cameras and remote controls.
Documentation: Confirm ownership, service history, inspection records, serial numbers, applicable tank certifications and any requirements for the material or jurisdiction involved.

Photos and listing descriptions are useful for narrowing the field, but they do not replace an independent inspection. Ask the seller which figures are measured, which are estimates and what recent work has been completed.

New or used: which offers better value?

A new combo vac can offer current controls, a known maintenance starting point, warranty coverage and the opportunity to match tank, blower, chassis and water-system specifications to the job. The trade-offs are typically a higher purchase price and potential build or delivery time.

A used vacuum truck may cost less and be available sooner. It can be a strong fit when its configuration already matches the work and its maintenance history is clear. Budget for a thorough inspection, immediate service and a contingency for wear items or application-specific changes.

Do not compare acquisition price alone. Estimate total cost of ownership using expected utilization, fuel use, disposal and refill time, maintenance, financing, insurance, operator training and likely resale value. Supply Post’s equipment financing resources can help buyers explore funding options, while the dealer directory provides another way to find sellers and equipment support.

2013 International Workstar Vactor vacuum truck listed on Supply Post — *A used 2013 International Workstar with a Vactor system.*

How to search listings efficiently

Begin with the work the truck must perform, then turn those needs into a short specification sheet. Include material type, typical hose distance and lift, daily water use, expected payload, disposal method, climate, road conditions and crew preferences.

When browsing vacuum and combo vac truck listings, use filters to narrow results by make, model, year, province and new or used condition. Compare promising units in the same order:

Confirm the unit’s intended application and availability.
Compare the chassis, tank, blower and water-system specifications.
Review kilometres, chassis hours, blower hours and service records where available.
Estimate transport, inspection, registration and any modification costs.
Contact the seller for missing details and arrange an inspection.

If you are still comparing vehicle types, browse the broader selection of trucks for sale. Buyers with flexible timing can also review equipment auctions, while short-term or project-based needs may be better served by equipment rentals.

Find the right vac truck on Supply Post

The right vacuum or combo vac truck is the one that matches the material, work cycle, payload and climate—not simply the unit with the largest tank or highest advertised output. Define those needs first, compare complete systems rather than isolated specifications, and verify condition before committing.

See current vacuum and combo vac trucks for sale and connect directly with sellers through Supply Post.

Frequently asked questions

What is the difference between a vacuum truck and a hydrovac truck?

A vacuum truck primarily recovers and transports liquids or debris. A hydrovac is a type of combo vac that uses pressurized water to loosen soil and a vacuum system to recover the resulting slurry, making it useful for exposing underground utilities.

Can a combo vac truck clean sewers and excavate soil?

Many combo units can support both applications, but the correct hose, nozzles, water pressure, flow, tank configuration and filtration are application-dependent. Confirm the complete specification rather than assuming every combo truck can perform every task.

What matters most when buying a used vacuum truck?

Prioritize suitability for the intended work, tank and blower condition, legal payload, water-system performance, service history and an operational inspection. Chassis kilometres alone do not reveal wear on the vacuum equipment.

How do I choose the right tank capacity?

Estimate the density and daily volume of the material, travel distance to disposal sites, water requirements and legal axle weights. The largest tank is not always the most productive choice if payload limits prevent it from being filled.

Are vacuum trucks available new and used on Supply Post?

Yes. Supply Post listings can include new and used vacuum, septic, hydrovac and combo vac units from dealers and private sellers. Inventory changes, so check the current Vac/Combo Vac category for availability.