The WJA Code of Practice
The Water Jetting Association has unified its Code of Practice into a single, comprehensive Black Code, bringing together the former Blue, Red and Purple Codes into one clear, consistent industry standard.
Everything now sits within one streamlined framework, making it easier than ever to follow, apply and demonstrate best practice across all areas of water jetting.
The Industry Benchmark
The WJA Code of Practice is recognised as some of the most detailed and advanced water jetting standards in the world.
Developed with industry experts and aligned with guidance from the Health and Safety Executive, they provide a trusted benchmark for safe, effective and professional operations.
From team responsibilities through to equipment use and legal compliance, the Black Code defines how water jetting should be carried out safely, consistently and to the highest standard.
City and Guilds Accredited
HSE Aligned
Global Reach
What the Code Covers
Personal protective equipment
The water jetting team organisation and duties
Water jetting units
Hose assemblies inspection and testing
Control valves
Safe use of water jetting equipment
Care and maintenance of water jetting equipment
Water jetting accessories, including guns and nozzles
Health risks and response to injuries
Frost precautions
Waste disposal
Drainage law
Why the Code Matters
The Code is more than guidance it is the standard by which water jetting is judged.
It supports safer working environments, improved service quality, and steady clear expectations across the industry. For our members, it provides confidence that work is being carried out to recognised standards.
For WJA members, it reinforces your commitment to operating at the highest level of professionalism, safety and compliance.
Safer working environments.
Higher quality service to clients.
Clear industry expectations.
Increased client retention.
Continuous Development
WJA Code of Practice provides a clear, trusted standard for safe, high-quality water jetting.
First introduced in 1980, they evolved into the Blue, Red and Purple Codes. Shaped by industry expertise, compliance and regulation, they have continuously developed over time.
The new Code of Practice continues this progression: ensuring guidance remains practical, relevant and aligned with modern water jetting operations.
Join the WJA
Join the Water Jetting Association and benefit from industry-leading resources, expert technical support and a stronger reputation within the UK water jetting industry.
