Introduction

Professional pressure washers are capable of generating extremely high water pressures that can cause serious injury, equipment damage and property damage if used incorrectly.

This guide provides general safety information for the operation of professional pressure washers. It is intended to supplement, not replace, the operator manual supplied with the machine, formal operator training, workplace procedures, site-specific risk assessments or applicable legal requirements.

Safe operation should always take priority over productivity.

Safety Notice

WARNING

Professional pressure washers should only be operated by individuals who have been instructed in their safe operation and who have read and understood the operator manual supplied with the machine.

If you are unsure how to operate the equipment safely, stop and seek advice before continuing.

Operator Responsibilities

Before operating the machine, the operator should:

Read and understand the operator manual.
Be familiar with the machine controls.
Understand the emergency shutdown procedure.
Inspect the machine before use.
Wear suitable personal protective equipment.
Stop using the equipment immediately if an unsafe condition is identified.

Where pressure washers are used in workplaces, equipment should be operated in accordance with the employer's safe system of work and applicable health and safety requirements.

Work Area Safety

Before starting work:

Assess the work area for hazards.
Keep unauthorised persons away from the work area.
Identify slip, trip and fall hazards.
Consider drainage and water run-off.
Identify overhead and electrical hazards.
Ensure adequate lighting.
Consider weather conditions when working outdoors.

Never direct high-pressure water towards electrical equipment or installations unless they have been made safe in accordance with site procedures.

Pre-Use Safety Checks

Before operating the machine, ensure:

Engine oil level is correct.
Pump oil level is correct (where applicable).
Fuel system is free from leaks.
Water supply is adequate.
Inlet filter is clean.
Inlet hose is unrestricted.
High-pressure hose is undamaged.
Hose connections are secure.
Trigger gun operates correctly.
Spray lance is securely fitted.
Correct nozzle is installed.
Safety devices are present and functioning.
There are no visible leaks.
All guards are fitted correctly.

Do not operate the machine if any safety device is missing, damaged or inoperative.

Personal Protective Equipment (PPE)

Suitable PPE should be worn for the task being undertaken.

This may include:

Safety glasses or a face shield.
Hearing protection.
Waterproof protective gloves.
Protective footwear with good grip.
Close-fitting work clothing.

Additional PPE may be required depending on the working environment, cleaning application or chemicals being used.

Safe Operating Practices

Always:

Maintain a firm grip on the spray gun.
Ensure stable footing before operating the trigger.
Point the lance in a safe direction before starting.
Maintain an adequate water supply.
Keep hoses away from hot surfaces and sharp edges.
Remain alert throughout operation.
Stop the engine before carrying out maintenance or adjustments.

Never:

Point the spray at people or animals.
Operate from ladders or unstable platforms.
Leave the machine running unattended.
Modify or remove safety devices.
Fit components that are unsuitable for the machine.
Operate damaged equipment.

High-Pressure Water Hazards

High-pressure water can penetrate skin and underlying tissue.

Never:

Place hands or fingers in front of the nozzle.
Attempt to stop leaks with your hand.
Spray clothing or footwear while being worn.
Test the spray pattern against any part of the body.

Any suspected high-pressure injection injury is a medical emergency requiring immediate hospital assessment, even where the wound appears minor.

Always inform medical personnel that the injury involves a high-pressure fluid injection injury.

High-Pressure Hose Safety

High-pressure hoses operate under extreme pressure and should be treated as critical safety components.

Always:

Inspect hoses before every use.
Replace damaged hoses immediately.
Route hoses to minimise snagging or crushing.
Use replacement hoses and fittings suitable for the machine specification.

Never:

Kink or crush a high-pressure hose.
Drive vehicles over pressurised hoses.
Repair damaged high-pressure hoses.
Disconnect pressurised hoses or fittings.

Fuel Safety

When refuelling:

Stop the engine.
Allow hot components to cool.
Refuel outdoors or in a well-ventilated area.
Clean up fuel spills immediately.
Use approved fuel containers.

Never:

Refuel while the engine is running.
Refuel a hot engine.
Smoke or use naked flames during refuelling.

Carbon Monoxide Warning

Petrol and diesel engines produce carbon monoxide.

Carbon monoxide:

Cannot be seen.
Cannot be smelled.
Cannot be tasted.

Exposure may result in:

Headache.
Dizziness.
Nausea.
Unconsciousness.
Death.

Never operate engine-driven pressure washers inside:

Buildings.
Garages.
Workshops.
Shipping containers.
Enclosed trailers.
Confined or poorly ventilated spaces.

Always ensure adequate ventilation.

Electrical Safety

Before starting work:

Identify electrical hazards.
Isolate electrical equipment where appropriate.
Keep electrical leads clear of the work area.

Never direct high-pressure water towards live electrical equipment.

Chemical Safety

When using detergents or cleaning chemicals:

Follow the chemical manufacturer's instructions.
Wear appropriate PPE.
Avoid skin and eye contact.
Never mix incompatible chemicals.
Use only chemicals suitable for pressure washer systems.

Dispose of chemicals in accordance with the manufacturer's instructions and applicable environmental requirements.

Emergency Shutdown

Stop the machine immediately if:

A hose fails.
A coupling becomes loose.
Fuel leaks develop.
Abnormal vibration occurs.
Unusual noises develop.
Operating pressure becomes unstable.
Any unsafe condition is identified.

Before disconnecting any hose, lance or accessory:

Stop the engine.
Isolate the water supply.
Release trapped system pressure safely.

Do not restart the machine until the fault has been identified and rectified.

Maintenance Safety

Before carrying out maintenance:

Stop the engine.
Isolate the water supply.
Relieve all system pressure.
Disconnect the spark plug cap on petrol engines.
Allow hot components to cool.

Never dismantle pressurised components.

Only use replacement parts suitable for the machine specification.

Transport & Storage

Before transporting:

Secure the machine correctly.
Secure all accessories.
Protect hoses from damage.
Close the fuel valve where fitted.

Store equipment:

In a clean, dry location.
Protected from frost.
Away from ignition sources.
Out of reach of children.

Emergency Response

If a high-pressure water jet penetrates the skin:

Stop the machine immediately.
Seek emergency medical treatment without delay.
Inform medical personnel that the injury is a high-pressure fluid injection injury.
Do not assume a small wound is minor.
Do not delay treatment.

High-pressure injection injuries can cause severe internal tissue damage that may not be immediately visible.

Frequently Asked Questions

Can high-pressure water cause serious injury?

Yes. High-pressure water can penetrate skin and underlying tissue, causing serious internal injury that requires immediate medical treatment.

Should I always wear eye protection?

Yes. Suitable eye protection should always be worn to help protect against high-pressure spray and flying debris.

Can I operate a petrol or diesel pressure washer indoors?

No. Engine-driven pressure washers must never be operated inside enclosed or poorly ventilated spaces because of the risk of carbon monoxide poisoning.

Can I continue using a machine if it develops a leak?

No. Stop the machine immediately and identify the source of the leak before returning the equipment to service.

Related Technical Guides

Pressure Washer Troubleshooting
Pressure Regulator Explained
Why Do Pumps Fail?
Understanding Pump Cavitation
Nozzle Sizing & Selection Guide
Winter Storage & Frost Protection

Technical Disclaimer

Foreman Technical Guides provide general information to support the safe operation and maintenance of Foreman equipment. They are intended to supplement, not replace, the operator manual supplied with the machine, formal operator training, workplace procedures, site-specific risk assessments or applicable legal requirements. Always operate equipment in accordance with the manufacturer's instructions and only for its intended purpose.