Legionella risk audits2019-04-04T15:12:41+02:00

Our risk audits are conducted in accordance to the guidelines set out in South African National Standard (SANS 893) Part 1 (Risk management) and Part 2 (The control of Legionella in water systems) and those published by the European ELDSnet (European Legionnaires’ Disease Surveillance Network). For more details please consult the websites www.sabs.co.za and eldsnet@ecdc.europa.eu

The following are the requirements to implement a Legionella pneumophila risk reduction programme, and as such, these requirements will be audited:

  • Have one (named) person responsible for Legionella control.

  • Ensure the designated person is trained in the control of Legionella and that other staff members are trained to be aware of the importance of their role in controlling Legionella.

  • Keep hot water hot and circulating at all times: 52⁰C to 60⁰C (too hot to put hands into, or under for more than a few seconds). It must leave the hot water plant/system at 60 ºC or more and return at no less than 50 ºC.

  • Keep cold water cold at all times. It should be maintained at temperatures below 25⁰C (ideally 20ºC)

  • Run all taps and showers in guest-rooms for several minutes at least once a week if they are unoccupied and always prior to occupation.

  • Keep shower heads and taps clean and free from scale.

  • Clean and disinfect evaporative cooling towers and associated pipes used in air conditioning systems regularly—at least twice a year.

  • Clean and disinfect water heaters (calorifiers) once a year.

  • Disinfect the hot water system with a high level (50mg/L) of chlorine for 2 to 4 hours after work on water heaters and before the beginning of every season; or use appropriate heat shocking.

  • Clean and disinfect all water filters regularly; every one to three months.

  • Inspect water storage tanks, cooling towers and visible pipe work monthly. Ensure that all coverings are intact and firmly in place.

  • Inspect the inside of cold water tanks at least once a year and disinfect with 50mg/L chlorine and clean if containing a deposit or otherwise dirty.

  • Ensure that system modifications or new installations do not create pipework with intermittent or no water flow.

  • If there is a spa pool (synonymous with whirlpool spas, “Jacuzzis” or spa baths) ensure:

      • It is continuously treated with 2 to 3mg/L chlorine or bromine or equivalent and that the levels are monitored at least three times a day.
      • Replace at least half of the water each day.
      • Backwash the sand filters daily.
      • Clean and disinfect the whole system once a week.
  • Keep daily records of all water treatment readings such as temperature and chlorine concentrations and ensure they are checked regularly by the manager.

Legionella Checklists


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