Water hygiene services

Monitoring & control.

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What is water monitoring and control?

Water monitoring and control involve the regular inspection, testing, and management of engineered water systems to ensure safe operation and ongoing compliance with UK regulations. These activities help identify temperature fluctuations, stagnation, and bacterial risks such as Legionella before they become a threat to users or disrupt business operations.

At Complii, we provide a full suite of monitoring and control services designed to meet the requirements of HSG274, ACoP L8, and HTM 04-01. From temperature checks and TMV servicing to water sampling and remote monitoring, our data-driven approach ensures your systems remain compliant, efficient, and safe. Whether you manage a single site or a national portfolio, our accredited technicians deliver reliable results supported by UKAS-accredited laboratory analysis and digital reporting.

We're an accredited contractor

Why choose Complii?

How we can help.

Protect your people, property, and business. Here’s why we’re the right choice for monitoring and control.

Continuous compliance assurance

Our monitoring programmes are fully aligned with HSG274, ACoP L8, and HTM 04-01, providing a clear framework for demonstrating compliance during audits and inspections.

Reduced Legionella and microbial risk

Routine temperature checks, outlet flushing, and sampling prevent stagnation and create conditions that inhibit Legionella growth, keeping systems safe for users.

Real-time insights and digital reporting

Using IoT-enabled tools and mobile data capture, we deliver real-time results and easy-to-access reports, helping you respond quickly to potential issues.

Tailored monitoring regimes

Each programme is customised to your site, risk profile, and system type, ensuring efficient management without unnecessary cost or complexity.

Expert support and reliability

With decades of compliance expertise, our technicians bring both technical knowledge and practical experience, ensuring your monitoring regime is thorough and effective.

Peace of mind and long-term assurance

Our proactive monitoring helps you stay ahead of risks, reduce operational disruption, and protect your building occupants with full traceability of every result.

Your questions answered.

Typical activities include temperature monitoring (manual and remote), TMV servicing, tank inspections, showerhead cleaning, outlet flushing, cooling tower inspections, and water sampling for Legionella or Pseudomonas.
Monitoring provides ongoing evidence that your water systems are being managed safely and effectively. It’s a key requirement under HSG274 and ACoP L8 and helps prevent Legionella and other bacterial contamination.
Frequency depends on system type and risk level. For most sites, temperature monitoring and outlet flushing should be carried out monthly, with sampling and inspections at intervals defined by your risk assessment.
Yes. We provide IoT-enabled temperature monitoring systems that transmit real-time data and alerts, helping you manage compliance more efficiently across multiple locations.
Yes. All results are logged digitally, with detailed reports available immediately after inspection. Reports include non-conformities, risk flags, and recommended actions.
Absolutely. Our structured monitoring programmes and nationwide coverage allow us to manage compliance consistently across multi-site estates with centralised reporting and oversight.

News & insights

Insights / September 23, 2025

The benefits of thermographic imaging

Thermographic imaging is a powerful tool for identifying potential electrical faults before they become serious problems. By using specialist thermal cameras, engineers can detect heat patterns that indicate issues such as overloading, loose connections, or failing components.

For businesses, this proactive approach helps reduce risks, avoid costly downtime, and demonstrate compliance with electrical safety regulations.

News / September 23, 2025

PH Water and Air Technologies joins Complii

We are pleased to announce that PH Water and Air Technologies has joined Complii. This addition strengthens our water and air compliance services and further supports our mission to provide trusted, integrated compliance solutions across the built environment.

News / April 11, 2025

Sarah Dixon appointed CEO of Complii

Complii, the UK leader in integrated safety and regulatory compliance across electrical, fire, and water, has announced the appointment of Sarah Dixon as their new Chief Executive Officer.

Sarah joins Complii from Johnson Controls where she has been Managing Director of the fire and security businesses across the UK and Ireland.

See all news and insights

Compliance with confidence.

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