Pressure Washing

A stand alone, one day course for anyone operating machines of up to 3000psi

Key Facts

The WJA Pressure Washing course is a one day course covering safe water jetting operation using machines of up to 3000psi.

The course does not require the completion of the Safety Awareness course.

An introduction to Water Jetting

The WJA Pressure Washing course is a stand alone WJA certification. The course covers the very basic fundamentals of water jetting including jetting equipment, potential hazards and injuries, protective equipment and operational proceedures.

The course is ideal for driveway and roof cleaning services, car wash attendants and anyone else who will use machines up to 3000psi.   

Full course content can be found below.

Certificate and Photocard

After completing the WJA Pressure Washing course you will be awarded a Water Jetting Association Certificate of Training in Pressure Washing and a counterpart photo card showing to demonstrate your credentials. The awarded certificate upon completing the course is accredited by City and Guilds.

Valid for 3 years

The WJA Pressure Washing course is valid for three years and must be renewed within this time frame to maintain a valid certificate and photocard. This allows for crucial industry updates to be conveyed ensuring the safety of operators.


At the end of the module a 20 question multiple choice assessment must be completed. A score of 75% or greater must be achieved in order to pass the course and gain certification.

WJA Pressure Washing Course Content

Below is a comprehensive schedule of the course content

Registration & Introduction
Applications & Machines

Effect of varying pressure/flow at the nozzle – range of jetting machines – configurations & categories (pressure washers)

Legislation & The WJA Codes of Practice

Health & Safety at Work Act – WJA Codes of Practice – status, use and recognition by the HSE Management Regulation – Risk Assessment – PPE at Work Regulations – COSH – Employer/Employee responsibilities – Enforcement Powers – other relevant legislation e.g. Environmental Protection Act / Control of Pollution Act / Control of Pollution Act, Confined Space entry Requirements.

Jetting Equipment - Nozzles

Jet principles – purpose of nozzles – power of water jet – pressure/flow characteristics – jet reaction force. Types of nozzle – forward facing, fixed & spinning jets, multi-jet fixed & spinning nozzles.

Jetting Equipment - Pumps

Pump configuration – standard piston / plunger pump, positive displacement action, operating features, effects of blockages, varitation of plunger sizes. Other pump configurations – diaphragm and intensifier types. Drive arrangements – engine / electric motor, hazardous area equipment. Water supply/delivery features – filtration requirements, boost feed pumps, pulsation dampers, jump-jet. Pressure safety relief options – relief valve, bursting disc. Pressure guage features.

Jetting Equipment - Pressure Controls

Dump & dry shut controls – fail-safe / selector versions, direct manual operation / remote operation via electric-pneumatic-hydraulic controls, automatic unloader valve for dry shut, pressure regulators, and automatic off-load engine speed control systems.

Jetting Equipment — Water Jetting Hose

Hose construction & pressure ratings, external & internal damage possibilities, hazards arising from damaged hoses, inspection requirements. Hose end fittings, construction/assembly/testing. Connectors & hose end couplings types 8t features. Bore size & flow ratings. Hose for general/high flow/small bore tube & pipe cleaning. Pressure drop due to flow through hose & lances effect on pressure available at the nozzle.

Pressure Washing Hazards

Hazards arising directly from the water jet – from operation regime – from site environment.

Water Jetting Injuries

Effects of impact by high pressure water jet nature of internal injuries caused action in event of a jetting injury awareness of possible absence of visual injury & use of WJA Medical Card.

Personal Protective Equipment

General principles regarding use of PPE, as a last resort; Main body protection limits on effectiveness against direct impact of water jet; Protection of head, hands, feet, hearing, respiration.

Operational Procedures

Routine care 8t inspection site preparations – preparations for operation team operation. Safety points during operation use of manual jetting gun, tube/pipe/drain cleaning nozzle/hose combinations & techniques. Safe use of non-standard equipment e.g. tee nozzle. Site shutdown & anti freeze procedures. Use of DO / DO NOT GUIDE.


Review of course content as above – with opportunity for any further discussion before Questionnaire.

Train at our purpose built training facility

Built from the ground up as a water jetting training centre we can deliver all WJA courses in true to life scenarios

COVID-19 secure featuring one way system, social distancing, sanitisation stations and regular anti-bacterial fogging.

Tube bundles, concrete blocks, coated surfaces, sewer pipework. All available for practical demonstration and training purposes.

Our facility is flood lit to make training possible around the clock and all year round. 

We use bespoke resources to enhance our delivery and aid understanding. 

Our classroom environment features up to date audio/visual equipment to support our expert delivery.  

Our trainers are experienced in both water jetting and delivering training courses ensuring high levels of instruction.

Next Steps

Pressure washing can be just the start of a career in water jetting. Further a career in water jetting through WJA certification in Safety Awareness and an additional module.

Safety Awareness

Surface Preparation

Tube, Pipe & Bundle


Drain & Sewer