Water Supply Industry Interpretations and Advice
Area of Interest: Installation / Water Quality
Topic: Disinfection of pipework
Title: Time elapsed before re-disinfection
Regulation/Byelaw Clause Reference: G12.3
Reference Number: IWQ01
Decision Date: February 2002
Where disinfection of supply pipework or pipework in buildings is considered to be required, and the disinfected pipework is not commissioned and used within 30 days of successfully completing the initial disinfection, the disinfection process should be repeated before it is commissioned if a risk assessment shows that this is necessary.