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.