Overview

Sampling and temperature monitoring of water systems to assess the risk of Legionella pneumophila contamination. Applicable to cooling towers, hot and cold water systems, showers, decorative fountains, and HVAC humidifiers.

Laboratory analysis required

Methodology

  • Water temperature measurements at representative hot and cold water outlets
  • Collection of water samples from identified risk points (dead legs, storage tanks, showers, cooling towers)
  • Submission to accredited laboratory for Legionella culture testing
  • Assessment of water system temperatures against Legionella growth ranges (20–45°C risk zone)

What You Receive

  • Legionella sampling report with temperature readings and laboratory results
  • Risk classification per sampling point
  • Recommendations for temperature management, flushing regimes, and system maintenance
  • Guidance on Legionella management plan development
Applicable Legislation:
SANS 241; Facilities Regulations, 2004; OHS Act 85 of 1993 Section 8; ASHRAE Guideline 12.

Frequently Asked Questions

What is Legionella?
Legionella pneumophila is a bacterium that thrives in warm water systems (20–45°C). When contaminated water is aerosolised (e.g. through showers or cooling towers), people can inhale the bacteria and develop Legionnaires’ disease, a severe form of pneumonia.
Which buildings need Legionella testing?
Any building with a hot water system, cooling tower, spa pool, or water feature should be assessed. Hotels, hospitals, office buildings, and factories are particularly at risk.