Following the NSW Legionella Control Regulations, a unique identification (UID) number must be displayed on every cooling tower in NSW. As a safeguard during outbreaks of Legionnaires’ disease, UID numbers need to readily and accurately identify cooling towers. All stakeholders should refer to cooling towers by their UID number, even during routine management.

UID numbers are issued by local government authorities.

UID signs must be: 

• Clearly visible to a person examining or inspecting the system
• Minimum size 148 mm x 210 mm (A5)
• Made of a durable material

UID numbers should be used when describing the cooling water system on official documentation including:

• Service reports
• RMPs
• Audits
• Certificates
• Monthly reports
• Sample collection labels
• Laboratory test results
• Documents for audit

NSW Health has recommended a uniform and consistent numbering format for UID numbers:

In our recent experience, most local government authorities are adopting the NSW Health recommended naming convention, although some are adapted the format.

HydroChem can provide you with engraved Cooling Tower UID Number Signs via our online shop.

• Yellow and Black UID Number Signs
• Blue and White UID Number Signs

Failing to adhere to the requirements of mandatory cooling tower UID numbers will result in hefty fines.