Our client is a leading organisation within the water and wastewater industry, delivering innovative engineering and construction solutions that enhance the sustainability and performance of critical water infrastructure. With a strong reputation for technical excellence and a commitment to environmental responsibility, our client provides a collaborative, growth-focused work environment where your expertise contributes to the delivery of safe, reliable, and efficient water services. Role Summary As part of continued expansion and upcoming project work, our client is seeking a Commissioning Engineer to support the commissioning and optimisation of water and wastewater treatment plants, pumping stations, and associated process systems. This role plays a key part in ensuring that all systems operate safely, efficiently, and in accordance with regulatory and client specifications. The successful candidate will work closely with design, construction, and operations teams to deliver high-quality commissioning outcomes across multiple projects within the UK water sector. Key Responsibilities Plan, execute, and manage commissioning activities for water and wastewater treatment processes, pumping systems, and control equipment. Ensure all systems meet performance, quality, and environmental standards, in line with industry regulations (e.g., DWI, EA). Collaborate with multidisciplinary teams-including process, mechanical, electrical, and ICA engineers-to identify, troubleshoot, and resolve commissioning and performance issues. Develop and maintain commissioning documentation, including method statements, inspection and test plans (ITPs), reports, and handover packs. Support site acceptance testing (SAT) and performance testing in line with project requirements. Provide training and technical guidance to operations and maintenance personnel on newly commissioned assets. Drive continuous improvement initiatives, sharing lessons learned and best practices to enhance commissioning processes across the organisation. Ensure compliance with health, safety, and environmental (HSE) standards throughout commissioning activities. Essential Skills & Experience Degree in Engineering (Mechanical, Electrical, Process, or related discipline). Proven experience in commissioning within the water or wastewater industry, ideally involving treatment processes or network infrastructure. Strong understanding of process control, quality assurance, and H&S compliance within water projects. Excellent problem-solving, analytical, and fault-finding abilities. Strong communication and teamwork skills, with the ability to collaborate effectively across project teams. Desirable Skills & Experience Professional certification or accreditation (e.g., CEng, APM, or IChemE/IMechE membership). Familiarity with UK water industry standards and frameworks (e.g., WIMES, WRAS, DSEAR, CDM). Experience working on AMP projects or with major UK water utilities. Knowledge of SCADA systems, telemetry, and process instrumentation.