Water Treatment Operative

OCS Group; United Kingdom; Remote; GBP 28,000 - 36,000; Full time

Job summary

OCS UK & Ireland is seeking a Water Hygiene Engineer to inspect and maintain hot and cold-water systems, perform Legionella testing, and advise on remedial actions. The role covers building water systems, TMV-related work, and ensuring compliance with HSG274 Part 2 and L8 ACOP.

A valid UK driving licence and flexibility for on-site visits are required. You will conduct temperature monitoring, sampling, and reporting, while delivering customer-focused service and maintaining safety RAMS/CPP

Qualifications

• Proven experience as a Water Hygiene Engineer or similar role with Legionella control knowledge.
• Understanding of HSG274 Part 2, L8 ACOP, and UK water hygiene regulations.
• Ability to conduct water sampling, temperature monitoring, and basic water quality testing.
• Practical skills in cleaning, disinfection, and maintenance of water systems.
• Strong communication skills for client interaction and report writing.

Responsibilities

• Conduct routine inspections, cleaning and disinfection of hot and cold-water systems per HSG274 Part 2 and L8 ACOP.
• Perform temperature checks to keep hot water above 50°C and cold water below 20°C.
• Carry out water sampling, testing and analysis for bacterial contamination and interpret results.
• Assist in Legionella risk assessments and implement control measures.
• Maintain records of inspections, tests and remedial works for audits.
• Carry out remedial actions (descaling, flushing, chlorination) and TMV installs/maintenance.
• Respond to emergency callouts and liaise with clients to explain findings and obligations.
• Lead safety practices and ensure RAMS/CPP compliance; complete safety documentation.

Skills

Water hygiene

Legionella control

Temperature monitoring

Water sampling

Communication skills

Full UK driving licence

Education

City & Guilds Legionella Control in Hot and Cold-Water Systems

Tools

TMV installation

Water testing equipment

Job description

About The Role:

Key Responsibilities:

• Conduct routine inspections, cleaning, and disinfection of hot and cold-water systems, including storage tanks, calorifiers, and associated pipework, in line with HSG274 Part 2 and L8 Approved Code of Practice (ACOP).
• Perform temperature checks on hot and cold-water systems to ensure compliance with recommended ranges (e.g., hot water above 50°C, cold water below 20°C) to minimize Legionella risk.
• Carry out water sampling, testing, and analysis for bacterial contamination, including Legionella, and interpret results to recommend remedial actions.
• Assist in the completion of Legionella risk assessments for hot and cold-water systems, identifying potential hazards and implementing control measures as per HSG274 Part 2.
• Ensure all work adheres to current UK regulations, including the Health and Safety at Work Act, COSHH, and the Control of Legionella Bacteria in Water Systems (L8 ACOP).
• Maintain accurate records, logs, and reports of all inspections, tests, and remedial works for audit and compliance purposes.

Remedial and Installation Work:

• Carry out remedial actions, such as descaling, flushing, and chlorination of water systems, to address identified issues and maintain water quality.
• Install, repair, and maintain water system components, including TMVs (thermostatic mixing valves), pumps, and pipework, to ensure optimal performance and compliance.
• Respond to emergency callouts to address water hygiene issues promptly and effectively.

Client Interaction and Communication:

• Liaise with clients to explain the findings, provide recommendations, and ensure understanding of water hygiene obligations under HSG274 Part 2.
• Deliver exceptional customer service, always maintaining professionalism and a positive representation of the company.

Health & Safety Responsibilities

Commitment to safety is fundamental to this role. Key responsibilities include:

• Lead by example in promoting and maintaining excellent health and safety practices across all work activities.
• Ensure compliance with current Health & Safety legislation and OCS policies, always maintaining a safe working environment.
• Quality & safety standards: Ensure that all equipment and work areas meet agreed health, safety, and quality standards, with all tasks delivered in accordance with Risk Assessment & Method Statements (RAMS) and Construction Phase Plans (CPP).
• Safety documentation: Oversee the completion of risk assessments, method statements, and toolbox talks, ensuring all safety protocols are followed effectively.

Essential Hiring Criteria:

• Proven experience as a Water Hygiene Engineer or similar role, with specific knowledge of hot and cold-water systems and Legionella control.
• Strong understanding of HSG274 Part 2, L8 ACOP, and relevant UK water hygiene regulations and guidelines.
• Ability to conduct water sampling, temperature monitoring, and basic water quality testing.
• Practical skills in cleaning, disinfection, and maintenance of water systems.
• Excellent problem-solving skills and attention to detail.
• Strong communication skills, both verbal and written, for client interaction and report writing.
• Full UK driving licence (travel to various client sites required).
• A willingness to work flexible hours, including occasional weekends and out-of-hours callouts.

Desirable:

• Relevant qualifications, such as City & Guilds Legionella Control in Hot and Cold-Water Systems, or equivalent water hygiene training.
• Experience with thermostatic mixing valves (TMVs) installation and maintenance.
• Knowledge of COSHH and safe handling of water treatment chemicals.

About The Company:

OCS UK & Ireland is a leading facilities management company with 50,000+ colleagues and a turnover in excess of £2bn. We deliver innovative, award-winning services within facilities management, hard services, cleaning, security and catering.

Our mission is to make people and places the best they can be for our colleagues, customers and the communities we serve. Our commitment to doing business the right way is rooted in our TRUE values -Trust, Respect, Unity, and Empowerment.

Why Work for OCS?

Award-Winning Employer: Ranked 36th on Glassdoor’s Best Companies to Work For 2025 — we value and motivate our people.

Digital Learning: The OCS Academy offers digital courses and resources to help you build skills and grow your career.

Retail Perks With our Hapi app, you can gain access to exclusive discounts, rewards and wellbeing resources.

Professional Growth: 600+ live learners across UK&I — Empowering colleagues with further development and qualifications!

Flexible Pay: Access a portion of earned wages before payday with our Wagestream App! (Contract Specific)

We are an equal opportunities employer and rely on a diverse workforce with a broad range of knowledge, skills, and backgrounds to deliver our goals. We offer an inclusive and welcoming environment and actively encourage applications from all individuals regardless of race, gender, nationality, religion, sexual orientation, disability, or age.