Mechanical Fitter

United Infrastructure is a dynamic and rapidly expanding business, focused on delivering critical infrastructure projects, across the utility and social infrastructure sectors.

Our team of highly skilled and hardworking specialists deliver innovative solutions to the complex challenges our clients face.

Our company is split into two business areas:

Utility Infrastructure – Our team of Utility Infrastructure specialists design, build and maintain critical water, energy (gas), power and telecoms infrastructure, for the UK’s largest network owners and operators.

Social Infrastructure - Our team of Social Infrastructure specialists revitalise homes and communities by carrying out a wide range of work, from retrofit to refurbishment, and maintenance.

As a Mechanical Fitter you will carry out planned, preventative, and reactive mechanical maintenance across water and wastewater treatment assets. The role ensures the reliability, performance, and regulatory compliance of equipment used in the abstraction, treatment, distribution, and discharge of water.

• Perform routine PPM (Planned Preventative Maintenance) on pumps, valves, gearboxes, motors, screens, clarifiers, and associated plant.
• Respond promptly to breakdowns, diagnose mechanical faults, and carry out corrective actions to minimise downtime.
• Install, overhaul, and commission mechanical equipment in line with specifications and industry standards.
• Conduct pipework repairs including flanged, threaded, and welded systems.

• Work to site safety rules, including permit‑to‑work, confined space entry, and lock‑out/tag‑out procedures.
• Ensure maintenance tasks align with water industry regulatory standards (e.g., DWI, EA, OFWAT where relevant).
• Maintain high housekeeping and hygiene standards, especially in potable water environments.

• Support engineers and operations teams with asset optimisation and equipment upgrades.
• Assist in shutdowns, plant outages, and installation projects.
• Keep accurate maintenance records using Total mobile/asset management systems.
• Identify opportunities to improve asset reliability and performance.
• Provide feedback on recurring failures and assist in root‑cause analysis.
• Support implementation of reliability‑centred maintenance practices.

• Strong mechanical fault‑finding and problem‑solving ability.
• Ability to read technical drawings, P&IDs, and OEM documentation.
• Skilled in maintaining rotating machinery (pumps, blowers, mixers, compressors).
• Experience with mechanical seals, bearings, alignment, and coupling systems.
• Knowledge of water/wastewater treatment processes (preferred).

• Good communication and teamwork, working alongside operators, engineers, and contractors.
• Ability to prioritise work, especially during breakdowns.
• Strong safety awareness and compliance‑led mindset.

• Recognised mechanical engineering qualification (NVQ Level 3 / City & Guilds / apprenticeship or equivalent).
• Proven experience as a Mechanical Fitter or Maintenance Technician.
• Experience in an industrial, utilities, or process‑plant environment.
• Confined space training (NC1/NC2).
• Experience with in the water or wastewater industry specifically.
• Water hygiene card (EUSR).
• IOSH Working Safely or similar safety qualification.
• Welding or fabrication skills.

• Based at treatment works, pumping stations, or regional sites.
• Includes site visits, climbing ladders, confined space areas (with training).
• Participation in standby/rota call‑out system may be required.
• Outdoor work in varying weather conditions

Some of our benefits include:

• Career development – from the moment you join, you’ll be supported to develop, grow your skill set and progress your career the way you want.
• Cultivate – access to our idea and innovation platform, empowering you to drive positive business change.
• Cycle to work scheme
• Discounts – access to our leisure and shopping discounts and rewards platform.
• Employee networks – opportunity to join our organisation wide employee networks such as our…