Commissioning​/Water Treatment Flushing Engineer

Pre-Commissioning Water Treatment / Flushing Engineer

Are you an experienced Pre-Commissioning Water Treatment / Flushing Engineer looking for your next challenge?

We're looking for a motivated professional to join the team, delivering high-quality pre-commissioning water treatment and flushing services across a range of exciting projects, including data centres, pharmaceutical facilities, commercial buildings, healthcare, and industrial developments
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As a Pre-Commissioning Water Treatment / Flushing Engineer, you'll be responsible for ensuring HVAC and water systems are cleaned, treated, tested, and fully prepared for commissioning in line with BSRIA BG29 & BG50 standards.

• Carry out pre-commission cleaning, chemical dosing, static and dynamic flushing of HVAC and water systems.
• Flush and treat closed and open loop systems, including CHW, LTHW, condenser, and domestic hot & cold water systems.
• Perform on-site water quality testing, including pH, conductivity, iron, hardness, and bacterial sampling.
• Interpret test results and adjust chemical treatment as required.
• Produce accurate documentation, including flushing certificates, water treatment reports, and compliance records.
• Operate flushing pumps, dosing rigs, side-stream filters, and associated equipment.
• Work closely with mechanical and commissioning teams to deliver projects safely and efficiently.
• Ensure all works are completed in accordance with HSE requirements and COSHH regulations.
• Attend client and site meetings, providing technical support where required.

• Minimum 1 year experience in water treatment, pre-commission cleaning, or mechanical flushing.
• Strong knowledge of BSRIA BG29 & BG50 guidelines.
• Experience working with HVAC systems, pipework, valves, strainers, and water treatment chemicals.
• Competent in water quality testing and the use of testing equipment.
• Excellent communication, reporting, and organisational skills.
• Full clean driving licence and willingness to travel nationwide.
• Closed loop water treatment, domestic water systems, cooling towers, or cleanroom water systems.
• Confined Space, MEWP, or other relevant site certifications.
• Experience supervising junior engineers or subcontractors.

• Competitive salary and benefits.
• Company vehicle and travel expenses (where applicable).
• Ongoing training and professional development, including BSRIA and LCA certifications.
• Opportunities to work on some of the most exciting construction projects.
• A supportive team environment with genuine opportunities for career progression.

If you're ready to take the next step in your career, we'd love to hear from you.

Know someone who would be a great fit? Feel free to share this opportunity with your network.