More Than Dust Control: How to Use Your Water Truck to Prevent Fire Emergencies

A truck most jobsites already have can wet down fire-prone ground and help control a blaze until firefighters arrive, with a few low-cost add-ons and some crew training.

• By Sara VanFleet
• Oct 22, 2026

Fire safety is critical on any jobsite. Project managers and construction owners have an obligation to ensure that fires are not only prevented, but that the team can properly handle them if one were to occur.

OSHA has several fire safety standards for construction sites. They cover everything, including equipment requirements, flammable materials, hot work, and ignition controls. However, despite how thorough OSHA's standards are, it's always beneficial to go above and beyond when it comes to safety. There is one piece of equipment that most construction sites use, but may not realize it can be used for fire protection as well: water trucks.

Most construction companies use water trucks to transport and distribute water for dust suppression and soil compaction. However, they can be incredibly useful for preventing fires, keeping them under control as authorities arrive, and even putting them out.

Most trucks carry between 2,000 and 5,000 gallons, more than enough to serve as a fire extinguisher in an emergency. In some rural areas, a water truck is the only source of pressurized water. Therefore, you need to make sure the truck is properly equipped to prevent and put out fires in an emergency.

Customize it properly

Most trucks already have front and rear sprayers, which can be helpful as is. However, you want to make sure that the truck also has a sprayer on both sides. This allows you to simply drive by an area with the truck, and water will spray out either side.

Side sprayers are user-friendly and operated via a switch in the cab. The sprayers can be used to prevent fires by wetting the ground. They can also be used to control and put out fires, if necessary. They are fairly affordable and not a big or complicated addition to the vehicle.

Make sure that the vehicle has high-pressure outlets connected to the main water pump. They can be installed on the sides, front, or rear depending on the truck configuration. They typically come in 1.5-inch and 2.5-inch connections. This helps ensure there is enough water pressure to saturate the ground and quickly put out potential fires.

Having a water cannon or high-pressure hose reel is also beneficial. They shoot farther with more pressure. However, the cannons alone can go for $10,000 to $20,000 before mounting and wiring. If affordable, they make a great addition to put out potential fires. However, the side sprayers are only a few hundred dollars and work just fine.

Train the crew

It's important to make sure that not only the water truck operator, but also the crew knows the truck isn't just there to suppress dust. It should be used to prevent fires by wetting the ground and, if needed, managing them. Thankfully, water trucks are a straightforward piece of equipment.

Make sure everyone knows how to use the custom additions, such as the side sprayers or the water cannon. Sprayers are controlled by a switch inside the cab. The crew can drive the truck close to the fire and use the switch to control the water. Make sure there is an emergency shutoff switch, and that they know where it is and how to operate it in case they lose control of the water pressure.

Make sure your crews take the time to practice with the truck add-ons. A high-pressure sprayer or cannon can be difficult to control if you've never done it before. The last thing you want is for someone to use it for the first time during an emergency.

Establish a relationship with the fire department

Most importantly, if the project is in a more rural area, make sure the fire department is aware of what you're doing and the water sources you have. If you have a water truck, let them know. They can use it during emergencies.

Give them as much information as possible about the project and all of your water supplies. If the fire hydrants are not active, make sure to clearly mark them and notify the fire department. The last thing you want is for them to waste time in the middle of an emergency.

Meeting basic OSHA standards is essential, but managers have a duty to maximize safety measures, especially when beneficial equipment is already on the jobsite. By adding minor customizations to standard water trucks, training crews in emergency procedures, and coordinating with local first responders, you turn a dust suppressor into a first line of fire defense.