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Water Jetting Association The Water Jetting Association (WJA) is a UK-based membership organisation for contractors, manufacturers, and equipment hire specialists operating across all industrial sectors, including petrochemicals, heavy engineering and construction. It is committed to the highest possible safety and technical standards for water jetting, including ultra-high-pressure water jetting, high pressure water jetting, pressure washing, and sewer cleaning. The WJA has two Codes of Practice: the Blue Code for high pressure and ultra-high pressure water jetting; and the Red Code for the safe use of water jetting in drains and sewers. Both codes of practice, developed with the assistance of industry-stakeholders and the UK’s Health and Safety Executive, are recognised as setting industry standards in the UK and internationally. The WJA is the UK’s largest provider of water jetting training. Its City & Guilds accredited courses are delivered by registered training providers and approved instructors in the UK and internationally.