A pressure washer looks like a hose and behaves like a tool. The injuries it causes are treated as serious wounds rather than grazes, and most of the damage people do with one — to themselves and to their houses — happens in the first hour of ownership.
What a jet does to skin
A high-pressure jet can break the skin and inject water and debris into the tissue underneath. Because the entry wound looks small and often does not bleed much, people underestimate it — and injection injuries carry a real infection risk that develops over hours.
The practical rules: never point the gun at a person or an animal. Never test it on your hand. Never let a child hold it. And if a jet does break your skin, treat it as an injury needing medical attention rather than a cut — tell whoever sees it that it was a pressure washer, because it changes how it is managed.
The ladder rule
Do not use a pressure washer from a ladder. This is the most dangerous thing homeowners do with these machines, and it is entirely avoidable.
The gun kicks when you squeeze it. Your footing is on a rung. Both hands are occupied. The ladder, the wall and your boots are wet. And you are pulling against a stiff hose that wants to drag you.
Buy reach instead: a telescoping extension wand covers a two-story wall from the ground, and a curved gutter attachment does gutters. Both cost a fraction of a fall.
Electrical precautions
Keep clear of panels, meters, service heads and outdoor outlets. Cover them or avoid them entirely.
Use a GFCI-protected outlet for an electric machine. Most ship with one on the plug; if yours does not, use a protected circuit.
Keep connections out of standing water, including the point where your extension cord meets the machine. Elevate it rather than leaving it in a puddle.
Gas machines never run indoors or in a garage, including with the door open. Carbon monoxide is odorless and kills people doing exactly this.
Protect yourself
Eye protection, always. Splash-back off a wall is continuous, and it carries grit, chemical and whatever was on the surface.
Closed shoes with grip. Not sandals. The ground will be wet and slippery and you will be walking backwards.
Long trousers. Mostly against debris coming back at your legs.
Gloves if you are using chemicals, and read the label of whatever you are using — particularly for bleach mixes.
Three habits that prevent property damage
Start with the widest nozzle. White 40 degrees, every time you begin. Step narrower only when you know the surface can take it.
Start further away and move in. Distance is your real control. Two feet, then closer until it is working, then stop.
Test somewhere invisible. Behind a downpipe, under a step, the back corner of the deck. Thirty seconds, on every new surface.
And know the list of things not to point it at at all: surfaces you should never pressure wash.
Two mechanical safety points
Release the pressure before disconnecting anything. Machine off, water off, trigger squeezed. A fitting removed under pressure can travel.
Seat quick-connect tips fully. Pull the collar back, push the tip home until it clicks, then tug it. A half-seated tip exits under pressure at speed.
The rest of the first-use sequence is in how to set up a pressure washer.
