Mechanical Site Supervisor – OCU Water Sector in Wales

Department: Water

Employment Type: Freelance

Location: North Wales

Reporting To: Steve Rogers

OCU leads the way in end-to-end infrastructure engineering across the utilities, digital, and energy markets, specializing in the safe and efficient delivery of complex client requirements. With a breadth of capability, depth of operational capacity, and a commitment to innovation, OCU is not just part of the market — it is leading it. Working directly with many of the UK’s leading water, energy transition, telecoms, and infrastructure clients, we are looking for an experienced Mechanical Site Supervisor to join our growing Water sector team. This is an opportunity to play a key role in the delivery of wastewater infrastructure and treatment projects, supporting site operations across mechanical installation and maintenance works within live operational environments.

Key Responsibilities

• Supervise daily site activities, subcontractors, and direct labour, ensuring all mechanical works are completed safely, in line with specifications, and to programme requirements.
• Oversee installations including pumps, pipework, valves, mechanical equipment, and associated infrastructure works across wastewater treatment facilities.
• Conduct site inspections, quality checks, and safety audits while supporting the management of site resources, workflow planning, and productivity.
• Support incident and near‑miss reporting, ensuring corrective actions are implemented and a strong safety culture is maintained.
• Ensure all site documentation, inductions, permits, and safety procedures are in place and compliant with company and industry standards.
• Work closely with project managers, engineers, and wider delivery teams to ensure projects are delivered successfully within challenging operational environments.

Skills, Knowledge and Expertise

• Previous site supervision or site management experience within the mechanical, water, or wastewater sector.
• Experience working on wastewater treatment projects; strong understanding of mechanical installations and site operations within live environments.
• Valid SMSTS or SSSTS qualification; IOSH or NEBOSH certification considered advantageous.
• Knowledge of confined spaces, deep excavation safety, and working at height practices.
• Strong leadership and communication skills, ability to coordinate teams, manage subcontractors, and maintain high standards of safety and quality.
• Full UK driving licence.

About OCU Group

OCU Group is one of the UK’s fastest-growing companies, delivering complex projects across power, utilities, water, and digital infrastructure. With sales growing five-fold to £1.1bn over the last five years, we are expanding both organically and through acquisitions, including recent growth in Australia and New Zealand. For experienced professionals, OCU offers meaningful responsibility, the chance to influence delivery, and career progression in a business that invests in capability, autonomy, and high performance. For those starting their careers, we provide structured routes through apprenticeships, graduate programmes, and training academies, with hands‑on experience on real projects and supportive mentors to help you learn and progress. We value safety, integrity, collaboration, and doing things properly and we support people who want to make a tangible impact.

Our commitment to inclusion

At OCU Group, we believe that diversity and inclusion are fundamental to building a workplace where people feel valued, supported and able to do their best work. We are an inclusive employer and welcome applications from people of all backgrounds. As part of our commitment to fairness and equality, we may ask candidates to complete an equal opportunity monitoring form. We are proud to be a Disability Confident employer. This means we are committed to offering an interview to candidates with a long‑term health condition or disability who meet the essential criteria for the role. If this applies to you, please contact us.