The challenge
The water system serving a major UK airport carried a persistent, recurring pathogen problem. Conventional chlorine-based dosing had been applied again and again, in one stretch as many as twenty-five times at around GBP 1,950 a treatment, and the contamination kept coming back.
For an operator with a legal duty of care over water safety, a recurring Legionella risk is not a maintenance nuisance, it is a liability. The site needed a result that would hold, not another temporary knockdown.
What we did
We replaced the failing regime with a disinfection approach designed to reach the biofilm where pathogens survive and re-grow, the exact failure mode conventional dosing leaves behind. It was applied as a shock dose to clear the system, then a low maintenance dose to keep it clear.
The work was carried out on the live system, with no rebuild and no extended shutdown, and every result was sent to an independent accredited laboratory for confirmation.
The result
Cleared in four days, and held.
The result held on a routine maintenance dose, and the client extended the approach across the wider airport water network.
Every figure was confirmed by a UKAS-accredited third-party laboratory, the standard of evidence a water-safety responsible person and an enforcing authority expect to see.
Why it matters
Recurring waterborne pathogens are a controllable, but unforgiving, risk. This result shows the bioload can be brought to zero and kept there on the assets already in place, with accredited evidence for the compliance file. The same approach applies wherever a duty of care over water safety meets a system that conventional dosing keeps failing to control.
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