Jet Truck vs. Jet Vac Truck vs. Hydro-Excavation

Table of Contents 

What Is a Jet Truck?
What Is a Jet Vac Truck?
Where Hydro-Excavation Fits
Sewer Equipment Misconceptions
Sewer Equipment Comparison Chart
When to use Sewer Equipment: Municipal Scenario Examples
Fleet Planning: How Municipalities Should Think About It
Why Service & Support is Just as Important as the Equipment

If you’ve worked in municipal sewer services for any length of time, you’ve probably heard these terms used interchangeably:

“Send the jet truck.”
“Bring the vac truck.”
“Get the hydro unit out there.”

They all use water. Many use a vacuum. They’re all mounted on trucks or trailers. But operationally, they serve different purposes. When a downtown line is backing up or you’re responding to emergency sewer cleaning after a storm event, those differences matter. Sending the wrong truck doesn’t just slow the job, it can create repeat issues, second mobilizations, and unnecessary strain on your crew.

What Is a Jet Truck?

A jet truck, often called a sewer jet truck or one of the many forms of truck-mounted sewer jetters, is built around one primary function: high-pressure water cleaning inside pipe systems.

It delivers pressurized water through a hose and nozzle designed to:

• Break apart grease
• Cut roots
• Dislodge sediment
• Restore flow in municipal sewer piping

The water pressure does the work. Different nozzles control spray patterns and cutting action. Forward-facing jets help penetrate blockages, while rear jets pull the hose through the line and scour pipe walls.

This is what people mean when they talk about high-pressure sewer jetting.

Where a Jet Truck Excels

A jet truck is ideal for routine municipal sewer cleaning and preventive maintenance programs. If your department follows a scheduled line cleaning strategy, this is often the most efficient and cost-effective tool.

It’s also effective when the goal is to restore flow quickly in moderate blockages where debris volume is manageable. A leading example of a straight jet rodder platform is the Model 800 HPR, widely recognized in the industry for high-performance sewer jetting without vacuum debris removal.

Trailer-Mounted Jetters: In smaller municipalities, trailer-mounted jet rodder units (such as the well-known 747 or Mongoose) are often used for preventive maintenance and lighter service areas. These tow-behind units can be pulled with pickup trucks and provide flexibility where full-size trucks aren’t necessary.

Where It Has Limits

A jet truck breaks material loose. It does not remove it from the system. In some cases, that’s fine, but in others where debris volume is heavy, pushing material downstream simply relocates the problem. That’s where a jet vac truck comes in.

What Is a Jet Vac Truck?

A jet vac truck combines high-pressure jetting and vacuum removal in one unit. You’ll also hear it referred to as a combination or ‘combo’ truck. 

For example, Sewer Equipment of America’s ECO900 is a full combination platform designed for municipal sewer systems. It integrates high-pressure jetting, powerful vacuum airflow, and debris storage in a single unit built for daily infrastructure work. This means crews can jet the line and simultaneously vacuum out grease, sludge, sand, rocks, and other debris.

In real-world municipal sewer systems, this matters more than many realize. If a line contains significant buildup (think grease or storm sediment), breaking it loose isn’t enough. You need to remove it entirely.

Why Combo Units Dominate Municipal Fleets

Most municipal sewer services rely heavily on jet vac trucks because they offer operational flexibility. They can handle routine cleaning, catch basin work, and emergency sewer cleaning without switching equipment.

They reduce the need for a second mobilization. They prevent debris from re-settling. And in storm conditions, that debris tank capacity becomes critical.

Where Hydro-Excavation Fits

A hydro-excavation truck uses either high-pressure air or water, along with vacuum, for excavation rather than internal pipe cleaning. These trucks are designed to operate with both systems, allowing operators to remove soil from around buried utilities without inserting a hose into a sewer line. When working near natural gas infrastructure, industry practice is to use air instead of water.

Hydro-excavation trucks are used to:

• Daylight pipes
• Expose damaged municipal sewer piping
• Prepare for repairs
• Prepare a site for the installation of new utilities 
• Work safely around gas, electric, water, and sewer infrastructure

The RAMVAC is an example of a hydro-excavation unit designed specifically for controlled soil removal and utility exposure.

If your project requires only hydro-excavation, a dedicated hydrovac truck is typically the best fit, as it’s purpose-built for safe, precise soil removal around active utilities. However, for many municipalities, budget constraints make it difficult to purchase both a dedicated hydro-excavation truck and a separate jetting unit. As a result, some operations may forego jetting entirely on certain days, focusing solely on excavation, while jetting is carried out on others. In these cases, a combination truck equipped with both jetting and hydro-excavation capabilities offers versatility. 

Sewer Equipment Misconceptions 

It’s a common misconception that “more pressure is better” in high-pressure sewer jetting. In reality, key factors like nozzle selection, flow rate (gallons per minute), hose reel control, water tank capacity, and operator awareness are just as important as raw pressure. There is no single perfect setup for every situation.

Proper operator training, like what is provided by the factory-trained team at Chadwick Ba-Ross, is what prevents damage and extends equipment life.

Sewer Equipment Comparison Chart

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Feature	Jet Truck	Jet Vac Truck	Hydro-Excavation Truck
High-pressure water	Yes	Yes	Yes
Vacuum system	No	Yes	Yes
Debris tank	No	Yes	Yes
Cleans inside sewer lines	Yes	Yes	No
Removes debris from system	No	Yes	Limited
Exposes buried utilities	No	Yes	Yes
Best for routine line cleaning	Yes	Yes	No

When to use Sewer Equipment: Municipal Scenario Examples

Grease Blockage in a Downtown Line

A restaurant-heavy district reports backups, and CCTV confirms a significant buildup of fats, oils, and grease (FOG). The Environmental Protection Agency (EPA) explicitly identifies FOG as a common cause of blockages contributing to sanitary sewer overflows (SSOs). These issues are especially prevalent in downtown corridors, which tend to have more service connections, increasing both risk and complexity in managing FOG-related problems.

A jet truck could penetrate and restore flow temporarily. But if you don’t remove that grease, it will cool, harden, and return. A jet vac truck is the better choice here. It allows crews to break apart the grease and vacuum it out entirely. That reduces repeat calls and protects downstream infrastructure.

Note: A jet truck (sewer jet truck) can still be appropriate when inspection confirms lighter buildup and your system can safely convey the material.

Storm-Driven Surge Event

After heavy rainfall, sections of your municipal sewer systems are overloaded. Sediment and debris have accumulated in low points. Storm drains collect stormwater and snow melt, and if they clog with litter or leaves, it can cause flooding. This is a classic emergency sewer cleaning situation.

Vacuum airflow, tank capacity, and rapid deployment matter. A jet vac truck provides both cleaning and debris removal in one operation. A jet truck alone won’t handle heavy sediment effectively.

In these conditions, a single mobilization is critical. A jet vac truck allows crews to break up sediment and immediately remove it from the system. Without debris removal, material simply relocates downstream and creates another blockage point. 

Hydro-excavation isn’t built for internal line flushing, so it’s not appropriate in this case.

Exposing a Pipe Before Repair

A crew needs to access a section of municipal sewer piping to perform structural repair. You do not want a backhoe near active utilities.

If the call is “we need to expose buried utilities before we dig/repair,” the correct tool is typically hydro-excavation. It removes soil safely, reduces the risk of utility strikes, and allows precise exposure.

OSHA requires determining estimated utility locations before opening an excavation, contacting owners to locate markings, and determining the exact location by safe means as you approach the installation.

Routine Municipal Sewer Cleaning

Not every day is an emergency. EPA guidance emphasizes tying preventive maintenance cleaning schedules to known problem areas: grease/industrial discharges, hydraulic bottlenecks, poor design, root intrusion, sags, and displacements.

For scheduled maintenance across municipal sewer systems, many departments rely on jet trucks because they are efficient and straightforward. If debris volume is predictable and manageable, they get the job done.

However, departments dealing with older infrastructure or high debris loads often default to combo units for added flexibility.

Fleet Planning: How Municipalities Should Think About It

If you’re building or upgrading a fleet, the smartest approach isn’t “Which truck should we buy?” It’s “What problems are we solving most often?”

A larger city operating a wastewater treatment plant and maintaining extensive sewer networks will typically require full-size combination trucks with higher debris capacity, stronger vacuum airflow, and greater water volume. More pipe in the ground means more sediment, more grease, and more demand on equipment.

Smaller municipalities often take a different approach. Mid-size jet trucks or trailer-mounted jetters may be sufficient where pipe runs are shorter and debris volume is lower. These units can be cost-effective while still supporting a structured preventive maintenance program.

There is no universal “best” truck. The right unit depends on pipe volume, service density, and response expectations.

Why Service & Support is Just as Important as the Equipment

The truck or trailer itself is only part of the equation. Long-term fleet performance depends on support just as much as specifications.

Sewer equipment operates under high stress — pumps, vacuum systems, hydraulic components, and high-pressure water systems all require specialized service. Downtime during an emergency sewer cleaning event disrupts entire service areas.

Factory-trained technicians, regional service coverage, parts availability, and operator training make the difference between equipment that performs reliably and equipment that creates risk.

If you’re evaluating equipment for municipal sewer systems or emergency sewer cleaning, talk to a team that understands operational realities.

Contact Chadwick-BaRoss to discuss your sewer equipment strategy and make sure your fleet matches the challenges you’re actually facing.