Hot spa pool, also known as hot Jacuzzi or hot spring, is a self-regulated body of warm water designed for sitting in. The temperature of water is usually maintained at 30 – 40  C, which provide a suitable environment for the growth of hazardous bacteria such as Legionella pneumophila. Users may get Legionnaires' disease if the pools contain Legionella pneumophila. Older adults, smokers and people with weakened immune systems are particularly susceptible to Legionnaires' disease. As Legionnaires' disease is fatal, water of hot spa pools should be checked regularly to ensure the absence of Legionella.

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Enviro Labs Ltd. (ELL) is a HOKLAS accredited laboratory that has been analyzing swimming pool and spa/jacuzzi pool waters for over 15 years. HOKLAS accreditation has been granted for all the above tests to ensure accuracy of the results. Below is a list of HOKLAS accredited tests related to pool water analysis.