Hybrid Solutions Group supported a newly purchased residential building that had been dormant for two years, delivering a rapid and comprehensive response to high Legionella counts discovered during mobilisation.
Through targeted remediation, improved system design, and an ongoing monitoring programme, we helped the client regain control of the water system, reduce operational risk, and progress safely toward full occupancy.
The Problem
During routine cold-water storage tank (CWST) sampling at mobilisation, high Legionella counts were discovered across the system.
Because the building had been unused for over two years:
- Cold-water temperatures had risen into the 20–45°C Legionella growth band.
- Biofilm had formed throughout the pipework.
Until the risk was controlled, the asset could not be safely let, delaying occupancy, revenue recovery, and compliance alignment.
Challenges included:
- System-wide stagnation, rather than isolated issues.
- High-risk outlets like showers and taps needing replacement.
- Dead-legs in the plumbing increasing future biofilm growth risk.
A fast, structured, and fully compliant response was essential.
How We Fixed It
Hybrid Solutions Group took full ownership of the remediation, coordinating all investigation, treatment, and system improvements to restore safe operation.
Actions delivered:
- Confirmatory Legionella sampling to identify risk hotspots.
- A site-specific water-safety plan aligned with compliance and operational needs.
- Daily flushing, shock chemical disinfection, and replacement of high-risk outlets.
- Full site survey to remove dead-legs and reduce biofilm regrowth.
- TMV servicing and optimisation for improved temperature control.
- Recommendation of continuous chlorine-dioxide dosing for long-term prevention.
Our team ensured all works were safe, efficient, and minimally disruptive.
The Result
Legionella levels were reduced to a controlled range under a continuous monitoring, sampling, and treatment regime. This enabled leasing to progress and helped the building achieve over 80% occupancy.
Additional benefits included:
- Stronger regulatory compliance and H&S assurance
- Increased investor and insurer confidence
- Fewer emergency callouts and unplanned interventions
- Improved resident confidence and brand reputation
- A reusable water-safety SOP for portfolio-wide application
By managing the project end-to-end, we turned a high-risk mobilisation issue into a structured, long-term water hygiene solution protecting both people and assets.
