Legionella control is the program that keeps water systems, cooling towers, evaporative condensers, hot and cold water services, spray systems, from becoming incubators for Legionella bacteria and sources of Legionnaires disease. It is a maintenance-driven public health obligation: outbreaks traced to industrial cooling towers regularly make national news, and the investigation always reads the site’s monitoring records first.
The bacteria thrive roughly between 20 and 45 degrees, in stagnant water, biofilm, scale, and sediment, every one of which is a maintenance condition, not an act of nature.
Frameworks such as the UK’s ACoP L8/HSG274, ASHRAE 188, and EU national equivalents converge on the same skeleton: a named responsible person, a documented risk assessment per system, a written scheme of control, and relentless routine execution: temperature and biocide regimes, weekly and monthly checks, quarterly-to-periodic sampling, cleaning and disinfection at defined intervals and triggers, and records that prove all of it happened.
A single production cooling tower under a typical scheme accumulates: weekly checks of biocide dosing, conductivity, and general condition (52 work orders), monthly microbiological dipslides (12), quarterly Legionella samples to an accredited lab (4), and at least an annual, often semi-annual, drain-down, clean, and disinfection (2), roughly 70 scheduled interventions per tower per year, each producing a reading or certificate an inspector may request years later. A dipslide trending upward triggers corrective action within days: dosing review, possible remedial disinfection, and a re-test, on a defined action-level table, not judgment calls under pressure. Multiply by four towers and a hot-water system and the program only survives inside a scheduling system.
Fabrico is not a water treatment provider and does not set your control scheme; competent water hygiene specialists do. Fabrico executes it: every check, dose, sample, and clean as recurring work orders with readings captured at the asset, action-level breaches escalating to corrective work with owners, contractor certificates attached to system history, and idle-system restart procedures gated by their cleaning steps. When the environmental health inspector asks for two years of tower records, the answer is minutes, not archaeology. EU-built, with EU data residency.
Per your risk assessment and local regime: quarterly is a common baseline for cooling systems, with increased frequency after positive results, remedial work, or control excursions. Routine monitoring (temperatures, biocide, dipslides) runs far more often and is what catches drift early.
The classic regime: store hot water at 60 degrees or above, distribute so outlets reach 50 degrees (55 in some healthcare regimes) within a minute, and keep cold water below 20. Where scald risk requires mixing valves, the risk assessment addresses the tepid zone they create.
No. The organism lives in biofilm and within amoebae, invisible at any distance, and aerosol drift can affect people far beyond the fence line. Only the monitoring record, temperatures, chemistry, microbiology, cleaning evidence, describes the actual state.
Want 70 interventions per tower per year to run themselves on schedule? Book a Fabrico demo to see water-hygiene compliance carried by a field-ready CMMS.
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