BPW Module 5: Pressure Washing Health & Safety Guide
Health & Safety — PPE, Risk Assessment & Safe Working Practice
Pressure washing carries real injury risks that are entirely preventable with the right knowledge and habits. This module covers everything you are legally and professionally required to have in place before you start any job.
Learning Outcomes — Module 5
- Select and use the correct PPE for pressure washing work
- Understand the legal duty of care for yourself and others on site
- Complete a basic site risk assessment before starting any job
- Understand COSHH obligations when using cleaning chemicals
- Identify the most common pressure washing injuries and how to prevent them
- Set up a safe working area on a domestic or commercial site
Health & Safety Is Not Optional — It Is Your Legal Baseline
As a self-employed operator or business owner, the Health and Safety at Work Act 1974 applies to you. You have a legal duty to protect yourself, your employees (if any), and any members of the public who may be affected by your work. This is not a box-ticking exercise — it is the framework that determines your liability if something goes wrong on site.
The good news is that pressure washing is a manageable risk activity. The hazards are well understood, the controls are straightforward, and a professional operator who follows correct procedure is very unlikely to cause harm to themselves or anyone else. This module gives you that procedure.
The practical reality: Most pressure washing injuries happen to operators who are in a hurry, working without PPE because it is inconvenient, or who have never been formally told what the risks are. This module exists so that you cannot claim the latter — and so you have the knowledge to avoid the former.
PPE — What You Need and Why
| PPE Item | Specification | Why It Is Required |
|---|---|---|
| Eye protection | Safety goggles or wraparound safety glasses rated EN166 | High-pressure water, debris, and chemical splash. Standard prescription glasses are not PPE. |
| Waterproof gloves | Chemical-resistant nitrile or rubber gloves — not standard washing-up gloves | Protection from chemical contact and from high-pressure water injection injury at close range |
| Footwear | Steel toe cap wellington boots or safety boots rated S5 with waterproof uppers | Slip resistance on wet surfaces, protection from dropped equipment and high-pressure lance contact |
| Waterproof clothing | Waterproof trousers and jacket — hi-vis if working near traffic | Keeps you dry and functional throughout the job. Cold, wet operators make poor decisions. |
| Hearing protection | Ear defenders or plugs rated for prolonged exposure if using petrol machines | Petrol pressure washers typically exceed 85dB — the threshold for mandatory hearing protection under COSHH |
| Face shield | Full face shield when using chemical pre-treatments or working in confined areas | Protects the full face from chemical splash — goggles alone are insufficient when applying concentrate |
High-pressure injection injury: This is the most serious injury risk in pressure washing. A high-pressure water jet directed at skin — even briefly — can inject water, bacteria, and debris deep into tissue. Injuries can appear minor at the surface and cause serious internal damage. Never direct a lance at yourself or anyone else, and never test pressure with your hand. Any suspected injection injury requires immediate hospital treatment, not first aid.
Site Risk Assessment
A risk assessment is a structured review of the hazards present on a site and the controls you will put in place to manage them. For domestic pressure washing, this does not need to be a lengthy document — but it does need to happen before you start work, and it should be recorded for any commercial job or any job where you identify a significant hazard.
The five steps of a basic risk assessment
- 1. Identify the hazards — what could cause harm? Slippery surfaces, passing pedestrians, parked vehicles, overhead cables, uneven ground, chemicals in use.
- 2. Decide who might be harmed — yourself, the client, neighbours, passing members of the public, pets.
- 3. Evaluate the risks and decide on controls — for each hazard, what is the likelihood and severity, and what will you do to reduce the risk?
- 4. Record your findings — on any commercial job, write it down. A simple site-specific record is sufficient.
- 5. Review and update — if conditions change during the job, reassess. A dry day becoming wet, or a pedestrian area becoming busy, changes the risk profile.
Common hazards on a domestic pressure washing site
| Hazard | Risk | Control Measure |
|---|---|---|
| Wet surfaces | Slip and fall — operator and public | Anti-slip footwear, signage or barriers to keep public off wet area |
| Chemical use | Skin and eye contact, inhalation | Correct PPE, COSHH assessment, keep public clear during application |
| High-pressure lance | Injection injury, debris strike | Never point at people, keep bystanders clear, use correct nozzle |
| Electrical equipment near water | Electric shock | RCD protected supply, keep connections off ground, inspect cables before use |
| Hoses and cables on ground | Trip hazard | Route hoses away from pedestrian paths, use hose bridges where necessary |
| Working near traffic | Vehicle strike | Hi-vis clothing, cones or barriers to create a safe working zone |
| Overspray onto adjacent property | Damage to vehicles, glazing, planting | Pre-job walkround, sheeting or moving vulnerable items before starting |
COSHH — Control of Substances Hazardous to Health
If you use any cleaning chemical on a job — biocide, degreaser, acid cleaner, or pre-treatment — you are legally required to assess the risk of that substance under COSHH regulations. This does not require a specialist — it requires you to read the product's Safety Data Sheet (SDS) and apply the controls it specifies.
What a COSHH assessment covers
- What the substance is and what it contains
- What harm it can cause — skin, eye, respiratory, environmental
- Who may be exposed — you, the client, members of the public
- What PPE and handling controls are required
- What to do in case of accidental exposure or spillage
- How to store and dispose of the product correctly
Where to get the Safety Data Sheet: Every professional cleaning chemical supplier is legally required to provide an SDS for each product. It is usually available on their website or on request. Read the SDS before using any new product for the first time. The PPE section tells you exactly what you need to wear — do not guess.
Chemicals most commonly used in pressure washing
- Sodium hypochlorite (bleach-based biocide) — effective on algae, moss, lichen. Corrosive to skin and eyes, toxic to aquatic life. Requires eye protection, gloves, and careful drainage management.
- Alkaline degreasers — used for oil and grease contamination. Can cause skin irritation and eye damage. Nitrile gloves and eye protection required.
- Acidic surface cleaners — used for mineral staining, rust, and efflorescence. Corrosive — full face shield, chemical-resistant gloves, and protective clothing required.
- Quaternary ammonium compounds (QACs) — biocidal pre-treatments. Moderate hazard — gloves and eye protection required. Toxic to aquatic life.
Electrical Safety
Electric pressure washers introduce the specific hazard of electrical equipment operating in a wet environment. This combination requires specific controls that must be in place on every job.
- RCD protection — always use a Residual Current Device (RCD) between the mains supply and your machine. A portable RCD plug adaptor costs under £20 and can prevent electrocution. This is non-negotiable.
- Cable inspection — inspect the power cable before every job. Any damage, kinking, or exposed conductor means the machine does not go on site that day.
- Extension cables — use only outdoor-rated extension cables of the correct current rating for your machine. Domestic indoor extension reels are not suitable. Keep the cable drum fully unrolled to prevent heat build-up.
- Connections off the ground — never leave electrical connections resting in standing water. Use cable tidies or hang connections off the ground where possible.
Setting Up a Safe Working Area
Before you start the machine, take five minutes to set up the site correctly. This is not about bureaucracy — it is about ensuring that nothing unexpected can cause harm while you are focused on the job.
- Walk the full area to be cleaned and identify trip hazards, loose items, and anything that could be damaged by overspray
- Move or sheet any vehicles, garden furniture, or planted pots in the overspray zone
- Warn the client that the area will be wet and slippery during and after the job
- If the site is accessible to the public or neighbours, use cones or barriers to define the working area
- Check where runoff water will flow — ensure it is not going into a storm drain if you are using chemicals
- Confirm your electrical supply is RCD protected and all connections are secure before powering on
The pre-job five minutes: A proper site setup takes five minutes and prevents the majority of on-site incidents. Operators who skip it because they are in a hurry are the ones who damage a client's car with overspray, trip over a hose, or get a complaint about chemical runoff into next door's garden. Five minutes at the start of every job is the cheapest insurance you have.