• WSD Circular Letters
• Technical Requirements for Plumbing Works in Buildings
• Guide to Application for Water Supply
• Guidelines for Electronic Submission of Application for Water Supply with Building Information Modelling
• Previously Used Documents (HKWSR & Handbook on Plumbing Installation)
• Common Observations in Plumbing Proposals

Note:
Unless otherwise specified, the Technical Requirements for Plumbing Works in Buildings and the Guide to Application for Water Supply will be effective for all new applications (Form WWO 542/ Form WWO 46) submitted on or after 1 October 2018.  For details, please refer to WSD Circular Letter No. 4/2018.