Water-based aquaculture workers carry out manual activities in the ongrowing processes of cultured aquatic organisms in water-based suspended systems (floating or submerged structures). They participate in extraction operations and the handling of organisms for commercialisation. Water-based aquaculture workers maintain and clean facilities (nets, mooring ropes, cages)..

Water conservation technicians install systems to recover, filter, store and distribute water from different sources such as rainwater and domestic greywater.

Water conservation technician supervisors supervise the installation of systems to recover, filter, store and distribute water from different sources such as rainwater and domestic greywater. They assign tasks and take quick decisions.

Water engineers research and develop methods for the provision of clean water, water treatment and flood damage prevention and reaction. They research water needs in a location and develop methods for meeting those needs, such as designing and developing projects for managing water resources such as treatment plants, pipelines, pump systems, irrigation or draining systems and other water supply systems. Water engineers also ensure proper installation of these systems on construction sites. Water engineers also maintain, repair and build structures that control water resources, such as bridges, canals and dams.

Water systems engineering technicians aid engineers in the development and implementation of water supply and water treatment systems. They monitor the operations to ensure compliance with health and safety regulations, check water quality and ensure implementation of water-related legislation.

Water jet cutter operators set up and operate a water jet cutter, designed to cut excess material from a metal workpiece by using a high-pressure jet of water, or an abrasive substance mixed with water.

Water network operatives maintain pipes and pumping stations used for water supply, waste water removal and sewerage. They perform planned maintenance and repair tasks and clear blockages in pipes and drains.

Water plant technicians maintain and repair water treatment and supply equipment in a water plant. They ensure the provision of clean water by measuring the water quality, ensuring it is filtered and treated correctly, and maintaining distribution systems.

Water quality analysts safeguard the quality of water through scientific analysis, ensuring quality and safety standards are met. They take samples of the water and perform laboratory tests, and develop purification procedures so it can serve as drinking water, for irrigation purposes, and other water supply purposes.

Water traffic coordinator manage the movements of a vessel in ports and waterways. They ensure the efficient deployment of vessels of a shipping company.

Water treatment plant managers supervise water treatment, storage and distribution in a water plant. They ensure the plant's operations are compliant with regulation, and supervise staff. They also implement new policies, and oversee equipment maintenance.

Water treatment system operators treat water to ensure safety for drinking, irrigation, or other use. They operate and maintain water treatment equipment and ensure the water is safe for bottling and use in food production by thoroughly testing before distribution, and by meeting environmental standards.

Waterway maintenance labourers maintain canals, dams and other waterway structures such as coastal or inland water plants. They are responsible for the construction of breakwaters, canals, dikes and embankments as well as other works in and around water.

Wave soldering machine operators set up and operate machines to solder electronic components to the printed circuit board. They read blueprints and layout designs.

Wax bleachers operate and maintain filter presses and tanks, used in wax bleaching, for candle production processes.

Wearing apparel patternmakers interpret design sketches and cut patterns for all kinds of wearing apparel using various handtools or industrial machines complying customer requirements. They make sampling and prototypes in order to produce series of patterns of wearing apparel in different sizes.

Wearing apparel pressers use steam irons, vacuum pressers, or hand pressers to shape wearing apparel.

Weather forecasters gather meteorological data. They predict the weather according to these data. Weather forecasters present these forecasts to the audience via radio, television or online.

Weavers operate the weaving process at traditional hand powered weaving machines (from silk to carpet, from flat to Jacquard). They monitor fabric quality and condition of machines such as woven fabrics for clothing, home-tex or technical end uses. They carry out  mechanic works on machines that convert yarns into fabrics such as blankets, carpets, towels and clothing material. They repair loom malfunctions as reported by the weaver, and complete loom check out sheets.

Weaving machine operators set up, operate and monitor weaving machines .They work with specialised machinery, techniques and materials to process threads of yarn into weaved products such as clothing, home-tex or technical end products. They maintain and repair weaving machinery and ensure operations run without problems.

Weaving machine supervisors monitor the weaving process. They operate the weaving process at automated machines (from silk to carpet, from flat to Jacquard). They monitor fabric quality and condition of mechanical machines such as woven fabrics for clothing, home-tex or technical end uses. They carry out maintenance works on machines that convert yarns into fabrics such as blankets, carpets, towels and clothing material. They repair loom malfunctions as reported by the weaver, and complete loom check out sheets.

Weaving textile technicians perform operations related to setting up weaving processes.