Please note that all the circular letters held under this web page are in PDF format and you need to download the latest version of Acrobat Reader to view and print these documents.
The following list is a complete set of existing Circular Letters that are currently in force.
From time to time, new Circular Letters are added to the list to promulgate new policy decisions and procedures. Circular Letters are removed from the list when they are outdated or their contents have been subsumed in other relevant publications issued by Water Supplies Department.
A full set of circular letters can be downloaded (file size of ~6.2MBytes) at this link.
Please note that all the circular letters held under this web page are in PDF format and you need to download the latest version of Acrobat Reader to view and print these documents.
The following list is a complete set of existing Circular Letters that are currently in force.
From time to time, new Circular Letters are added to the list to promulgate new policy decisions and procedures. Circular Letters are removed from the list when they are outdated or their contents have been subsumed in other relevant publications issued by Water Supplies Department.
A full set of circular letters can be downloaded (file size of ~12 MBytes) at this link.
Please note that all the circular letters held under this web page are in PDF format and you need to download the latest version of Acrobat Reader to view and print these documents.
The following circular letters have been either superseded or subsumed under relevant documents. For the subsumed circular letters, the policies and procedures contained therein can now be found in the document(s) (Technical Requirements for Plumbing Works in Buildings and Guide to Application for Water Supply) indicated in the table below and should continue to be followed.
| No. | Description | Reason of Removal | Date Removed | Category | Applicable to | |
|---|---|---|---|---|---|---|
| LP | AP | |||||
| 2025 | ||||||
| 1/2025 | Streamlined Procedure of Fresh Water Cooling Towers Scheme in respect of Application for Water Supply | Section 3.4 of "Guide to Application for Water Supply" is updated and Appendix 44 is added to incorporate the content of the subject Circular Letter | 12 Feb 2025 | 3 | Yes | Yes |
| 2024 | ||||||
| 11/2024 | Self-Certification Scheme for Application for Water Supply for Catering Business Trades | Section 4.3.7 and Appendices 39 to 43 of "Guide to Application for Water Supply" re added to incorporate the content of the subject Circular Letter | 12 Feb 2025 | 3 | Yes | Yes |
| 10/2024 | Simplified Flushing Protocol for Commissioning Stainless Steel Fresh Water Plumbing System | Sections 4.4.1 and 4.5, Appendices 2(IV) and 17 of "Guide to Application for Water Supply" are updated and new Appendix 18B is added to incorporate the content of the subject Circular Letter | 12 Feb 2025 | 2 | Yes | Yes |
| 9/2024 | Revised Water Sampling Sequence for Commissioning Fresh Water Plumbing System | Appendices 6 and 19(B) of "Guide to Application for Water Supply" are updated to incorporate the content of the subject Circular Letter | 12 Feb 2025 | 3 | Yes | Yes |
| 6/2024 | Proposed Amendments to "Guide to Application for Water Supply" | Section 7.2 of "Guide to Application for Water Supply" is updated to incorporate the content of the subject Circular Letter | 12 Feb 2025 | 3 | Yes | Yes |
| 5/2024 | Electronic Approval of Application for Water Supply (AWS) | New Section 3.18 of "Guide to Application for Water Supply" is added to incorporate the content of the subject Circular Letter | 12 Feb 2025 | 3 | Yes | Yes |
| 3/2024 | Proposed Amendments to "Guide to Application for Water Supply" | Section 4.4.1 and Appendix 19(B) of "Guide to Application for Water Supply" are updated to incorporate the content of the subject Circular Letter | 12 Feb 2025 | 3 | Yes | Yes |
| 2023 | ||||||
| 7/2023 | Proposed Amendments to "Guide to Application for Water Supply" | Appendices 4 and 37 of "Guide to Application for Water Supply" are updated to incorporate the content of the subject Circular Letter | 12 Feb 2025 | 3 | Yes | Yes |
| 6/2023 | On-Site Water Test for Effecting Water Supply to Fire Service under Exceptional Circumstances | New Section 4.5.3 of "Guide to Application for Water Supply" is added to incorporate the content of the subject Circular Letter | 12 Feb 2025 | 3 | Yes | Yes |
| 5/2023 | Updated Water Sampling Protocol for Commissioning of Fresh Water Plumbing System | Appendices 6 and 19(B) of "Guide to Application for Water Supply" are updated to incorporate the content of the subject Circular Letter | 12 Feb 2025 | 3 | Yes | Yes |
| 4/2023 | Updated Version of "Guide to Application for Water Supply" | Obsolete | 12 Feb 2025 | 3 | Yes | Yes |
| 2/2023 | Enhanced Time Frame for Issuing Reminders and Cancellation in Processing Applications for Water Supplies (AWS) | New Section 3.15A of "Guide to Application for Water Supply" is added to incorporate the content of the subject Circular Letter | 12 Feb 2025 | 3 | Yes | Yes |
| 1/2023 | Streamlined Measures in Delinking Approval to Connection Point from Plumbing Proposals in Application for Water Supply (AWS) for New Buildings | New Section 3.10A and Appendix 38 of "Guide to Application for Water Supply" are added and Appendix 2(I) is updated to incorporate the content of the subject Circular Letter | 12 Feb 2025 | 3 | Yes | Yes |
| 2022 | ||||||
| 7/2022 | Electronic Submission of Application for Portable Meter from Company only and Request for Work to be carried out by the Water Authority | A new section 3.17 is added to incorporate the content of Circular Letter No. 7/2022 related to Electronic Submission of Application for Portable Meter from Company only and Request for Work to be carried out by the Water Authority. | 18 Aug 2023 | 1 | Yes | Yes |
| 6/2022 | Ensuring Adequate Illumination for Carrying out Non-Destructive Tests at Solder Joints | A new section 4.3.4.2 is added to incorporate the content of Circular Letter No. 6/2022 related to Ensuring Adequate Illumination for Carrying out Non-Destructive Tests at Solder Joints. | 18 Aug 2023 | 2 | Yes | Yes |
| 5/2022 | Updated Water Sampling Requirements for Commissioning of Fresh Water Plumbing System | A new section 4.4.3.1 and Appendix 19(C) are added and Appendix 19(B) is updated to incorporate the content of Circular Letter No. 5/2022 related to Updated Water Sampling Requirements for Commissioning of Fresh Water Plumbing System. | 18 Aug 2023 | 3 | Yes | Yes |
| 3/2022 | Voluntary Scheme in Enhancing Plumbing Works Control Stage 2 – Provisional of Site Supervision Team for Large-scale Plumbing Works | Subsumed into Addendum No. 1 to CL3/2022 | 31 Mar 2025 | 1 | Yes | Yes |
| 4/2022 | New Requirements on Inspection of carrying out Non-Destructive Tests at Solder Joints | A new section 4.3.4.1 is added to incorporate the content of Circular Letter No. 4/2022 related to Requirements on Inspection of carrying out Non-Destructive Tests at Solder Joints. | 18 Aug 2023 | 2 | Yes | Yes |
| 2/2022 | Control Measures on Long Screw Connector / Flange Adaptor for Water Meter in Inside Service | Subsumed into Part B:B5 of ‘Technical Requirements for Plumbing Works in Buildings’ | 12 Jan 2026 | 4 | Yes | Yes |
| 2021 | ||||||
| 10/2021 | Updated Version of “Technical Requirements for Plumbing Works in Buildings” and “Guide to Application for Water Supply” | Obsolete | 18 Aug 2023 | 3 | Yes | Yes |
| Addendum to 5/2021 | Voluntary Scheme in Enhancing Plumbing Works Control Stage 1 – Registration of Registered Plumbing Contractors (Provisional) | Subsumed into Addendum No. 2 to CL 5/2021 | 22 Apr 2022 | 1 | Yes | Yes |
| 9/2021 | Guidelines for Electronic Submission of Application for Water Supply with Building Information Modelling | A new section 3.16 is added to incorporate the content of Circular Letter No. 9/2021 related to Electronic Submission of Applications for Water Supplies with Building Information Modelling. | 18 Aug 2023 | 3 | Yes | Yes |
| 8/2021 | Enhanced Processing Mechanism for Application for Water Supply for New Buildings | Subsumed into Section 3.15 and Appendix 36 of "Guide to Application for Water Supply" | 31 Dec 2021 | 3 | Yes | Yes |
| 7/2021 | Record of Cleansing and Disinfection of Fresh Water Inside Service under the Commissioning Requirements | Subsumed into Section 4.4.5 and Appendix 37 of "Guide to Application for Water Supply" | 31 Dec 2021 | 3 | Yes | Yes |
| 6/2021 | New Requirement on Meter Position for 40mm Meters | Subsumed into Figure 4 of ‘Technical Requirements for Plumbing Works in Buildings’ | 31 Dec 2021 | 3 | Yes | Yes |
| 5/2021 | Voluntary Scheme in Enhancing Plumbing Works Control Stage 1 – Registration of Registered Plumbing Contractors (Provisional) | Subsumed into Addendum No. 2 to CL 5/2021 | 22 Apr 2022 | 1 | Yes | Yes |
| 4/2021 | Updated Pre-approved Standard Plumbing Designs for New Village Type Houses | Subsumed into Section 3.13.1 and Appendices 29 and 30 of "Guide to Application for Water Supply" | 31 Dec 2021 | 3 | Yes | Yes |
| 3/2021 | Leaching Test for General Acceptance (GA) Application of Taps and Mixers | Subsumed into Part B:B2.3 of ‘Technical Requirements for Plumbing Works in Buildings’ | 12 Jan 2026 | 4 | Yes | Yes |
| 2020 | ||||||
| 6/2020 | Updated Version of “Technical Requirements for Plumbing Works in Buildings” and “Guide to Application for Water Supply” | Obsolete | 31 Dec 2021 | 3 | Yes | Yes |
| 5/2020 | Electronic Submission for Simple Cases of Applications for Water Supplies | Subsumed into Section 3.14 and Appendix 34 of "Guide to Application for Water Supply" | 2 Dec 2020 | 3 | Yes | Yes |
| 4/2020 | Mandatory Lead Check for Soldering Materials in Pipe-fittings with Integral Solder Ring upon delivery to Site | Subsumed into Sections 4.1.4 and 4.3.1.3 of "Guide to Application for Water Supply" | 2 Dec 2020 | 3 | Yes | Yes |
| 2/2020 | New Application Form and Streamlined Procedure to enhance completeness of Submission Documents for Applications for Water Supplies | Subsumed into Section 3.2.1 and Appendix 2 of "Guide to Application for Water Supply" | 2 Dec 2020 | 3 | Yes | Yes |
| 1/2020 | Minimum Meter Size Requirement for Trade Fresh Water Supply to Designated Business Categories | Subsumed into Section 3.1.11 of ‘Technical Requirements for Plumbing Works in Buildings’ | 2 Dec 2020 | 3 | Yes | Yes |
| 2019 | ||||||
| 11/2019 | Water Efficiency Requirements for Water-closet Fitment in Inside Service | Subsumed into Sections 7.1.1, 7.3.4 and 7.5.2 of ‘Technical Requirements for Plumbing Works in Buildings’ | 2 Dec 2020 | 3 | Yes | Yes |
| 10/2019 | Updated Version of “Technical Requirements for Plumbing Works in Buildings” and “Guide to Application for Water Supply” | Obsolete | 2 Dec 2020 | 3 | Yes | Yes |
| 9/2019 | Installation of Security Seals for Newly Installed Water Meters of size 40mm or above | Subsumed into Section 4.2.4 and Appendix 35 of "Guide to Application for Water Supply" and Section 3.1.12 of ‘Technical Requirements for Plumbing Works in Buildings’ | 2 Dec 2020 | 3 | Yes | Yes |
| 8/2019 | Penalty and Demerit Point System for Managing the Performance of Licensed Plumbers | Subsumed into Section 4.3.5 of "Guide to Application for Water Supply" | 2 Dec 2020 | 1 | Yes | Yes |
| 7/2019 | Electronic Submission for Applications for Water Supplies to New Village Type Houses using Pre-approved Standard Plumbing Design Drawings | Subsumed into Section 3.13 and Appendices 29 to 33 of "Guide to Application for Water Supply" | 2 Dec 2020 | 3 | Yes | Yes |
| 6/2019 | Streamlined Measures for Processing Applications for Water Supply to New Village Type Houses | Subsumed into Section 3.2.3, Appendices 27 and 28 of "Guide to Application for Water Supply" | 2 Dec 2020 | 3 | Yes | Yes |
| 5/2019 | Streamlined Measures for Processing Applications for Water Supplies to Improvised Sprinkler Systems | Subsumed into Section 3.5.1 of "Guide to Application for Water Supply" | 2 Dec 2020 | 3 | Yes | Yes |
| 3/2019 | Control on Lining Materials of Potable Water Tanks of Inside Service | Subsumed into Part B: B9 of ‘Technical Requirements for Plumbing Works in Buildings’ | 2 Dec 2020 | 4 | Yes | Yes |
| 2/2019 | Procedures for Applications for Water Supply in New Building Projects adopting "Modular Integrated Construction" Method | Subsumed into Sections 3.12, 4.1.3, 4.2A, 4.3.2A, 4.3.3A, Appendices 2 and 26 of 'Guide to Application for Water Supply' | 21 Oct 2019 | 3 | Yes | Yes |
| 1/2019 | Streamlined workflow for effecting of water supply to new village houses after disinfection of inside service | Subsumed into Section 4.5.1 of 'Guide to Application for Water Supply' | 21 Oct 2019 | 3 | Yes | Yes |
| 2018 | ||||||
| 6/2018 | Streamlined Procedures for Processing Applications for Water Supplies for Village Type Houses and Separate Metering | Subsumed into Sections 3.2.1A, 3.10, 4.1, 4.1.1, 4.1.2, 4.3.3, 4.8, Appendices 2, 3, 6 and 7 of 'Guide to Application for Water Supply' | 21 Oct 2019 | 3 | Yes | Yes |
| 5/2018 | Streamlined Procedures for Processing Applications for Temporary Water Supplies for Construction Site | Subsumed into Section 3.11 of 'Guide to Application for Water Supply' | 21 Oct 2019 | 3 | Yes | Yes |
| 9/2017 | Addendum to Circular Letter No. 9/2017 - New Commissioning Requirements for New Plumbing Works - Revised Systematic Flushing Record Form for New Buildings | Subsumed into Section 4.4.1, Appendices 2, 17 and 18A of 'Guide to Application for Water Supply' | 21 Oct 2019 | 3 | Yes | Yes |
| 4/2018 | Technical Requirements for Plumbing Works in Buildings and Guide to Application for Water Supply | Obsolete | 21 Oct 2019 | 3 | Yes | Yes |
| 3/2018 | Standing Arrangement for Random Inspection of New Plumbing Works during Construction Stage | Subsumed into Section 8 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 1 | Yes | Yes |
| 1/2018 | Scheme on Voluntary Submission of Inspection Checklist | Subsumed into Section 4.3.6 of ‘Guide to Application for Water Supply' | 1 Oct 2018 | 3 | Yes | Yes |
| 2017 | ||||||
| 10/2017 | New Commissioning Requirements for Plumbing Works in Occupied Buildings/Village Houses | Subsumed into Section 4.3.4 & 4.4 and Appendix 19 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 3 | Yes | Yes |
| 9/2017 | New Commissioning Requirements for New Plumbing Works (Please read in conjunction with Addendum to Circular Letter No. 9/2017) | Subsumed into Section 4.4 and Appendix 19 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 3 | Yes | Yes |
| 7/2017 | Submission of Consumption Flow Rates and Installation of Flow Restrictor | Subsumed into Sections 3.6, 4.2.3, Appendices 22, 23 and 24 of 'Guide to Application for Water Supply' | 21 Oct 2019 | 3 | Yes | Yes |
| 6/2017 | Systematic Flushing for New Plumbing Works | Subsumed into Section 4.3.1.2, 4.4.1 and 5 and Appendix 17 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 3 | Yes | Yes |
| 5/2017 | Online Re-plumbing Works | Subsumed into Section 3.3, 4.3.1.2 & 4.7and Appendix 3, 10, 11 and 20 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 3 | Yes | Yes |
| 4/2017 | Random Inspection of New Plumbing Works during Construction Stage | Superseded by CL No. 3/2018 | 1 Oct 2018 | 1 | Yes | Yes |
| 3/2017 | Enhancement Measures for Processing Applications for Water Supplies | Subsumed into Section 3.2.1, 4.1.1 and 4.3.1.1 and Appendix 2 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 3 | Yes | Yes |
| 2/2017 | Water Efficiency Requirements for Fittings in Inside Service | Subsumed into Section 4.1.2 and Appendix 7 of ‘Guide to Application for Water Supply’ and Section 7.3 and 7.4 of ‘Technical Requirements for Plumbing Works in Buildings’ | 1 Oct 2018 | 3 | Yes | Yes |
| 1/2017 | WSD Circular Letters in Force | Obsolete | 1 Oct 2018 | 1 | Yes | Yes |
| 2016 | ||||||
| 2/2016 | Inspection and Approval of Plumbing Works | Subsumed into Section 4.4.3 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 3 | Yes | Yes |
| 1/2016 | WSD Circular Letters in Force | Obsolete | 13 Jan 2017 | 1 | Yes | Yes |
| 2015 | ||||||
| 9/2015 | Task Group on Implementation of New Improvement Measures for Controlling Construction of Inside Service | Subsumed into Section 4.3.5 and 4.8 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 3 | Yes | Yes |
| 8/2015 | Inspection of Plumbing Works and Point Penalty System | Subsumed into Section 4.3.3 and 4.3.5 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 1 | Yes | Yes |
| 7/2015 | Revision of Application Forms and Pipes and fittings to be Installed in Plumbing Works | A new version of Form WWO 46 (version 01/19) was promulgated through WSD CL No. 6/2018. Form WWO 132 (9/2015) has been used for several years and the relevant parties are familiar with this version of the form. | 1 Jan 2019 | 3 | Yes | Yes |
| 6/2015 | Application for Water Supply Pipes and Fittings Approval | Subsumed into Part B:B2.1.2 of 'Technical Requirements for Plumbing Works in Buildings' | 21 Oct 2019 | 4 | Yes | Yes |
| 5/2015 | Water Sampling and Solder Joint Sampling and Testing for Newly Installed Fresh Water Inside Service | Subsumed into Section 4.3.4 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 3 | Yes | Yes |
| 4/2015 | Soldering for Copper Pipe Connections | Subsumed into Section 4.1.1.2 ‘Technical Requirements for Plumbing Works in Buildings’ | 1 Oct 2018 | 3 | Yes | Yes |
| 3/2015 | Updated Contact List of Case Officers for Application for Water Supplies | Subsumed into Section 4.7.2 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 3 | Yes | Yes |
| 1/2015 | Prohibition of Using Leaded Solder at Fresh Water Inside Services and New Parameters for Testing of Water Sample | Obsolete | 12 Feb 2025 | 3 | Yes | Yes |
| 2014 | ||||||
| 1/2014 | Preventing Unauthorised Use of Mains Water for Fresh Water Cooling Towers | Subsumed into Section 3.4 of ‘Guide to Application for Water Supply’ and Section 4.2.6.3.4 of ‘Technical Requirements for Plumbing Works in Buildings’ | 1 Oct 2018 | 3 | Yes | Yes |
| 2012 | ||||||
| 3/2012 | Licensed Plumber Directory (ESD Function) - Geographical Districts Served by Plumbers (Chinese version Only) | Obsolete | 26 Jan 2016 | 1 | Yes | NA |
| 2/2012 | Cleansing and Disinfection of Fresh Water Inside Service | Subsumed into Sections 4.4.1, 4.4.2, Appendices 19 and 25 of 'Guide to Application for Water Supply' | 21 Oct 2019 | 2 | Yes | Yes |
| 2010 | ||||||
| 5/2010 | Revision of Fees for Plumber's Licence Application and Associated Payments | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 4/2010 | New Facility - <Online Payment and Renewal/Reissue of Plumbers' Licence> (Chinese version Only) | Obsolete | 26 Jan 2016 | 1 | Yes | NA |
| 2/2010 | Amendments to the Hong Kong Waterworks Standard Requirements (HKWSR) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1/2010 | Minimum Flow Requirements for Draw-off Taps, Single and Combination Taps | Subsumed into Section 2.1.2 and Part B:B7 'Technical Requirements for Plumbing Works in Buildings' | 21 Oct 2019 | 2 | Yes | Yes |
| 2009 | ||||||
| 1/2009 | Pilot Scheme for the Submission of the Pre-approved Material List by Licensed Plumber for the Application for Water Supply for the Food Business (Restaurant) Premises | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 2008 | ||||||
| 1/2008 | Amendment to Point Penalty System for Defects in Plumbing Works Carried Out by Licensed Plumbers | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 2007 | ||||||
| 4/2007 | Amendment to "Hong Kong Waterworks Standard Requirement" | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 3/2007 | Enhancement for Application of Water Supplies | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 2/2007 | Amendments to the Hong Kong Waterworks Standard Requirements (HKWSR) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1/2007 | Reduction of the Minimum Residual Pressure | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 2006 | ||||||
| 4/2006 | Implementation of 5-Day Week for Applications of Plumbers' Licences | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 2/2006 | Addendum to WSD Circular Letter No. 2/2006 - Implementation of Master Metering Policy for Fresh Water and Temporary Mains-water for Flushing Inside Service and Fire Service | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 2/2006 | Amendment to WSD Circular Letter No. 5/2005 - Implementation of Master Metering Policy for Fresh Water and Temporary Mains-water for Flushing Inside Service and Fire Service (This Circular Letter is to be read in conjunction with Circular Letter No. 5/2005) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1/2006 | Implementation of 5-day Week in Water Supplies Department | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 2005 | ||||||
| 5/2005 | Implementation of Master Metering Policy for Fresh Water and Temporary Mains-water for Flushing Inside Service and Fire Service | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 4/2005 | Guideline on the Installation and Removal of MSL-TD88 Meters | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 3/2005 | Updated List of Persons to Contact in Water Supplies Department About Processing of Application for New Water Supply | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 2/2005 | Dropbox for Documents on Application for Metered Supply to New Building Projects | Obsolete | 1 Oct 2018 | 3 | Yes | Yes |
| 1/2005 | Reply with Quoting Reference and Plumbing Project/Service Address | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 2004 | ||||||
| 5/2004 | Rolling Out of Customer Care and Billing System Phase IIa Application of Plumbers' Licence and Application of Water Supply | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 4/2004 | Installation of Domestic Water Filters (including Water Filters Incorporated in Water Using Apparatuses, such as Drinking Fountain etc.) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 3/2004 | Revision of Form WWO132 | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 2/2004 | Excavation Permit Fees under the Land (Miscellaneous Provisions) (Amendment) Ordinance 2003 | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 1/2004 | Change in WWO 46 Submission Practice | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 2003 | ||||||
| 7/2003 | No Need to Re-apply for Acceptance or No-objection Letters of the Same Pipes and Fittings | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 6/2003 | Advice on Installation of a Filter before the Flushing Valve | Subsumed into Section 6.10.2.11 'Technical Requirements for Plumbing Works in Buildings' | 21 Oct 2019 | 2 | Yes | Yes |
| 5/2003 | Imposition of 5% and 10% Surcharge to Overdue Charge on Connection and Meter Installation for New Buildings | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 4/2003 | Amendments to the Hong Kong Waterworks Standard Requirements (HKWSR) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 3/2003 | Re-structuring of Customer Services Districts of the Water Supplies Department | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 2/2003 | Amendments to the Hong Kong Waterworks Standard Requirements (HKWSR) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1/2003 | Issue of "No-objection" Letters of Thermoplastic Pipes | Obsolete | 13 Jan 2017 | 4 | Yes | Yes |
| 2002 | ||||||
| 8/2002 | Renewal of Plumber's Licences | Obsolete | 26 Jan 2016 | 1 | Yes | NA |
| 7/2002 | Re-organisation of the Water Supplies Department | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 6/2002 | Cleaning and Sterilization of Fresh Water Mains of Inside Service | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 5/2002 | Waste Minimization Provision of Sanitary Fitments and Fittings in New Buildings | Subsumed into Section 7.1 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 3 | Yes | Yes |
| 4/2002 | Fresh Water Plumbing Quality Maintenance Recognition Scheme (renamed as "Quality Water Recognition Scheme for Buildings" since 1.1.08) | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 3/2002 | Approval of Water Supply Fittings | Obsolete | 26 Jan 2016 | 4 | Yes | Yes |
| 2/2002 | Helping Business Programme - Authorizing Private Developers and Authorized Persons to Undertake Water Supply Connection Works | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 1/2002 | Amendments to the Hong Kong Waterworks Standard Requirements (HKWSR) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 2001 | ||||||
| 3/2001 | A List of Licensed Plumbers | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 2/2001 | Form WWO 542 -Application for Water Supply / Request for Work to be Carried out by the Water Authority | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 1/2001 | Installation of Water Meters by Licensed Plumbers | Subsumed into Section 4.2 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 2 | Yes | Yes |
| 2000 | ||||||
| 4/2000 | The Use of Valve Type Flushing Devices and Minimum Flushing Volume | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 3/2000 | Waiving the Requirement to Seek Approval for Commencement of Inside Service/Fire Service Works | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 2/2000 | Target Response Time for Completing the Key Activities in respect of the Application for New Water Supply | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 1/2000 | Amendments to the Hong Kong Waterworks Standard Requirements (HKWSR) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1999 | ||||||
| 7/1999 | Amendments to the Hong Kong Waterworks Standard Requirements (HKWSR) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 6/1999 | Approval of Water Supply Fittings | Obsolete | 26 Jan 2016 | 4 | Yes | Yes |
| 5/1999 | Amendments to the Waterworks Regulations | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 4/1999 | Replumbing Works within Buildings | Subsumed into Section 3.3.3 of ‘Guide to Application for Water Supply’ | 1 Oct 2018 | 2 | Yes | Yes |
| 3/1999 | Delay in Reporting Completion of Plumbing Works | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 2/1999 | Helping Business Programme - Authorsing Private Developers and Authorised Persons to Undertake Water Supply Connection Works | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 1/1999 | Flushing Supply to Village Houses | Subsumed into Section 3.1 of 'Guide to Application for Water Supply' | 21 Oct 2019 | 3 | Yes | Yes |
| 1998 | ||||||
| 3/1998 | Amendments to the Hong Kong Waterworks Standard Requirements (HKWSR) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 2/1998 | Amendments to the Hong Kong Waterworks Standard Requirements (HKWSR) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1/1998 | Enquiries Related to Applications for New Water Supply | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 1997 | ||||||
| 3/1997 | Helping Business Programme - Authorising Private Developers to Undertake Water Supply Connection Works | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 2/1997 | Licensing of Plumbers | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 1/1997 | Identification of Internal Fresh and Salt Water Mains within Large Developments | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1996 | ||||||
| 4/1996 | Submission of Drawings for Approval | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 3/1996 | Hong Kong Waterwaters Standard Requirements (Aug 95) Amendment No. 1 | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 2/1996 | Hong Kong Waterworks Standard Requirements for Plumbing Installation in Buildings (August 1995) - Chinese Version | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1/1996 | Bounded Volume of WSD Circular Letters (12/95) | Obsolete | 26 Jan 2016 | 1 | Yes | Yes |
| 1995 | ||||||
| 6/1995 | Hong Kong Waterworks Standard Requirements for Plumbing Installation in Buildings (August 1985) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 5/1995 | Application for Constructing, Installing, Altering or Removing an Inside Service or Fire Service | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 4/1995 | A Guide to the Preparation of Plumbing Proposals | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 3/1995 | Use of Different Pipe Materials as Inside Service in Buildings | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 2/1995 | Amendments to the Hong Kong Waterworks Standard Requirements (HKWSR) | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1/1995 | Abandonment of the Use of Unlined Galvanized Steel Pipes as a Fresh Water Inside Service | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1994 | ||||||
| 1/1994 | Inspection of Concealed Inside Service/Fire Service | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 1992 | ||||||
| 3/1992 | Installation of Water Meters by Licensed Plumbers | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 2/1992 | Waterworks Regulation Part V - Lincensing of Plumbers | Obsolete | 26 Jan 2016 | 1 | Yes | NA |
| 1/1992 | Installation of Unvented Electric Thermal Storage Type Water Heaters | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1991 | ||||||
| 1/1991 | Use of Galvanised Steel Pipe and Fittings with Protective Internal Lining on Cold Water Inside Services | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1990 | ||||||
| 3/1990 | Installation of Unvented Electric Thermal Storage Type Water Heaters | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 2/1990 | Need for Plumbing Work to be Carried Out by Licensed Plumbers | Obsolete | 7 Apr 2020 | 2 | Yes | NA |
| 1/1990 | Illegial Connections at Meter Position and Installation of Inside Service or Fire Service Prior to Approval of Form G | Obsolete | 7 Apr 2020 | 2 | Yes | Yes |
| 1989 | ||||||
| 1/1989 | Application for Installation of Inside Services/Fire Services in New Building Projects | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| NA | Unvented Electric Storage Water Heater | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1988 | ||||||
| 1/1988 | Installation of Water Meters for Large Building Projects | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 1986 | ||||||
| 3/1986 | Control of Pipes and Fittings | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| 2/1986 | Amendments to Point Penalty System for Defects in Plumbing Works Carried Out by Licensed Plumbers | Obsolete | 26 Jan 2016 | 1 | Yes | NA |
| NA | Approval of Water Supply Fittings (Supplementary No. 3) | Obsolete | 26 Jan 2016 | 4 | Yes | Yes |
| 1985 | ||||||
| NA | Point Penalty System for Defects in Plumbing Works Carried Out by Licensed Plumbers (Supplementary) | Obsolete | 26 Jan 2016 | 1 | Yes | NA |
| 1984 | ||||||
| NA | Point Penalty System for Defects in Plumbing Works Carried Out by Licensed Plumbers | Obsolete | 26 Jan 2016 | 1 | Yes | NA |
| NA | Approval of Water Supply Fittings (Supplementary No. 2) | Obsolete | 26 Jan 2016 | 4 | Yes | Yes |
| 1983 | ||||||
| NA | Use of Polybutylene Pipes, Tubings and Fittings on Inside Service | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| NA | Provision of Water Supply and Fire Service Connections to New Developments | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
| NA | Installation of Unvented Thermal Storage Type Water Heaters | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1982 | ||||||
| NA | Approval of Water Supply Fittings (Supplementary No. 1) | Obsolete | 26 Jan 2016 | 4 | Yes | Yes |
| NA | Approval of Water Supply Fittings | Obsolete | 26 Jan 2016 | 4 | Yes | Yes |
| 1981 | ||||||
| NA | Provision of Proper Protection to Galvanized Iron Pipes Encased in Concrete | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1979 | ||||||
| NA | Cold Water Inside Services : Use of Unplasticised Polyvinyl Chloride Pipes and Fittings | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1978 | ||||||
| NA | Cold Water Inside Services : Use of Unplasticised Polyvinyl Chloride Pipes and Fittings | Obsolete | 26 Jan 2016 | 2 | Yes | Yes |
| 1975 | ||||||
| NA | Fire Service in Buildings | Obsolete | 26 Jan 2016 | 3 | Yes | Yes |
Main
Note
| Category | Information |
|---|---|
| 1 | Administration |
| 2 | Hong Kong Waterworks Standard Requirements |
| 3 | Application of Water Supply |
| 4 | Approval of Pipes and Fitting |