Mobile Water Treatment Engineer London & M25 Region £38,000 - £40,000 An industry-leading building services provider is looking for a skilled Mobile Water Treatment Engineer to join their growing team, covering sites across London and the M25. This is an excellent opportunity for someone with a strong water treatment background who enjoys a varied role across multiple commercial environments. Key Responsibilities: Manage and maintain water treatment systems across a portfolio of sites. Carry out water sampling, testing, and analysis to ensure compliance with Legionella regulations. Implement and maintain water treatment programs to control scale, corrosion, and biological growth. Perform routine inspections, cleaning, and chemical dosing on cooling towers and closed systems. Diagnose faults and resolve technical and operational issues on-site. Ensure accurate record-keeping and full compliance with ACOP L8, HSG274, and relevant legislation. Provide reports and technical updates to management and clients. Experience & Skills Needed: Proven hands-on experience in water treatment, including cooling towers and closed-loop systems. Strong knowledge of Legionella control and water hygiene best practices. Ability to troubleshoot and resolve water system and quality issues. Comfortable working independently across multiple sites. Strong communication and reporting skills. Qualifications: Recognised water treatment qualifications (e.g., City & Guilds, NVQ, or equivalent). Solid understanding of water hygiene regulations including ACOP L8 and HSG274. Offer: £38,000 - £40,000 per annum. Monday to Friday working hours Mobile role covering London and the M25. Company vehicle and travel expenses. Excellent job security with a reputable and growing business. Clear progression opportunities and ongoing training.