Our organisation regularly assesses the quality of domestic water services with regard to general microbiological activity.
Sterile containers containing Sodium Thiosulphate as per Environment Agency Practices and Procedures for sampling drinking water 2002 for sampling criteria and/or combination dipslides for bacteria count, and yeast/fungi count bacteria yeast and mould count.
Water samples collected from representative locations within the domestic water services. Bacteriological samples are collected and transported as per UKAS accredited sample methods. Samples are then independently analysed by a UKAS accredited laboratory.
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Water Temperature Measurements
To assess the physical temperature of the water services to establish safe thermal conditions exist.
Digital read out meters, immersion and contact temperature probes.
All testing is undertaken using equipment which has been pre-calibrated, in accordance with UKAS accredited test methods.
The optimum growth temperature for legionella pneumophila is between 35˚C and 46˚C.
Water systems that tend to promote growth of Legionnaires' disease bacteria include:
- pH between 5.0 and 8.5
- Sediment that tends to promote growth of commensal micro flora Microorganisms such as algae, flavobacteria, and Pseudomonas, which supply essential nutrients for growth of LDB, or protozoa that harbour the organism such as amoebae.
Water systems that frequently provide optimal conditions for growth of Legionnaires’ disease bacteria include:
- Cooling towers, evaporative condensers, and fluid coolers that use water evaporation to reject heat. These include many industrial processes that use water to remove excess heat.
- Domestic hot-water systems with water heaters that operate below 60˚C (140˚F) and deliver water to taps below 50˚C (122˚F).
- Poorly maintained humidifiers and decorative fountains that create a water spray and use water at temperatures favourable to growth.
- Spas and whirlpools with aeration.
- Dental water lines, which are frequently maintained at temperature above 20˚C (68˚F) and sometimes as warm as 37˚C (98.6˚F) for patient comfort.
- Possibly other systems such as stagnant water in fire sprinkler systems or warm water for eye washes or safety showers.
We can provide a nationwide service, so contact us today to discuss your requirements with one of our staff and obtain a no obligation quotation for your requirements.
