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How to Perform a Legionella Risk Assessment
A Legionella risk assessment is an important tool in the fight against mold and mildew in commercial buildings, since it can help reduce costs associated with remediation efforts, and also help identify areas that pose little or no risk to health. In order to perform a safety assessment on a property, an assessor will visit the building and assess all accessible surfaces for visible signs of mold, as well as areas that may be hidden from sight. During the visit, the assessor will collect samples of dust, take air sampling, and perform other functions to determine the extent of mold contamination. From this information the assessor can then develop a comprehensive report that details the mold-risk of each area. The report will include the concentration of various mold species, the elevations of various species in the vicinity, and the health risks associated with exposure to the species found in the building. By creating this report, the assessor can then suggest steps to mitigate the threat and avoid financial loss due to cleanup and repairs.
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Since water systems are often susceptible to infiltration by various types of bacteria and fungi, it is important that the owners of commercial buildings have regular assessments performed by competent professionals. Water quality specialists often utilize a legionella risk assessment to identify contamination sources, and advise owners how to make the necessary repairs. This information helps owners make better choices about the replacement or repair of existing water systems, which often carry a high level of risk.
An important aspect of the legionella risk assessment involves identifying the possible sources of contamination. If the building has a history of leaky pipes or other potential sources of contamination, it will often be necessary to replace these systems. One of the easiest ways to identify whether a plumbing system contains high levels of this particular organism is to conduct routine maintenance inspections. However, in cases where it appears that the source of contamination may lie far away from the building's water supply, the inspectors will also need to identify whether the contaminated water has been absorbed by building materials such as drywall. In these cases, specialized instruments called "colposcope" can be used.

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