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Rules 9-4 and 9-6 Building Appliances
Learn about the Air District's process for amending Regulation 9, Rules 4 and 6 to reduce emissions of nitrogen oxides from residential and commercial furnaces and water heaters in buildings in the Bay Area.
Find out about the status and anticipated timeline of the rule development process. Information on hearings, workshops, and other events is provided below, along with supporting documents and materials from the implementation working group.
As part of the recent amendments, the Air District committed to convene the Implementation Working Group (IWG). The IWG is composed of over 40 invited stakeholders representing a variety of stakeholder segments. The purpose of the IWG is to provide input to Air District staff’s periodic reports to the Board of Directors on the implementation of the Building Appliances Rules and to provide the Air District staff with insights on the technical readiness of the market and equitable transition to compliant appliances, so as to not unduly burden any income class or professional group. As such, the IWG will provide a forum for invited members to discuss technical and equity aspects of implementing the Building Appliances Rules.
The first five IWG meetings took place virtually via Zoom in 2023 and 2024. The last IWG meeting is scheduled to take place virtually on August 20, 2024 from 1-4 PM. Members of the public may attend the webinar in listen-only mode with the opportunity to provide public comments at the end of the meeting. You may join the meeting online to attend. An agenda for the meeting will be available prior to the meeting.
Staff have recently established a suite of dedicated webpages to house all information from past internal working group meetings. Agendas, research performed by consultants, and a list of current IWG members can be found on the Building Appliances Implementation Working Group webpage.
Additional general information regarding the Building Appliances Rule Implementation, including fact sheets, compliance dates, and supporting resources and incentives can be found on the Building Appliances Rule Implementation webpage.
To receive information on updates and events associated with the implementation of the amendments to Rule 9-4 and Rule 9-6, please sign up for the Air District's Building Appliances Email List:
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Air District staff developed amendments to Rule 9-4: Nitrogen Oxides from Fan Type Residential Central Furnaces and Rule 9-6: Nitrogen Oxides Emissions from Natural Gas-Fired Boilers and Water Heaters. These rules govern point of sale emission standards for small, typically residential and commercial, water and space heating systems. Emissions of nitrogen oxides impact local and regional air quality and contribute to the formation of ozone and secondary particulate matter.
Submission of Rule 9-4 and Rule 9-6 to the State Implementation Plan
The Board of Directors of the Bay Area Air Quality Management District conducted a public hearing on June 21, 2023 in which they directed staff to submit the current versions of Rule 9-4 and Rule 9-6 to the United States Environmental Protection Agency and the California Air Resources Board for inclusion in the State Implementation Plan (SIP).
The Air District accepted written comments relating to the upcoming public hearing regarding whether to submit Rules 9-4 and 9-6 for inclusion in the SIP through May 12, 2023. A summary of the comments received and Air District responses are available below.
Adoption of Amendments to Rule 9-4 and Rule 9-6
The Air District hosted a public workshop on October 7, 2021 to discuss initial outcomes from the Building Appliance Stakeholder Working Group and first draft language of regulatory amendments. Staff provided updates to the Stationary Source and Climate Impacts Committee through 2021 and 2022. In May of 2022, the Air District released a Notice of Preparation (NOP) of an Environmental Impact Report (EIR) and an Initial Study, as well as revised draft rule amendments.
The Air District released a Notice of Public Hearing, California Environmental Quality Act (CEQA) Notice of Availability, CEQA Draft EIR, proposed amendments to Rules 9-4 and 9-6, Staff Report, and other supporting materials in December 2022 and accepted written public comments on these materials. The Air District released the Final Proposal Package, including the proposed amendments to Rules 9-4 and 9-6, Final Staff Report, CEQA Final EIR, and Response to Comments.
- Frequently Asked Questions – Adopted Amendments to Rules 9-4 and 9-6
- Fact Sheet – Proposed Amendments to Rules 9-4 and 9-6
- Infographics – Proposed Amendments to Rules 9-4 and 9-6
- Notice of Public Hearing and Notice of Availability of DEIR
- Final Environmental Impact Report for Proposed Amendments to Rule 9-4 and Rule 9-6
- Staff Report – Proposed Amendments to Building Appliance Rules – Regulation 9, Rule 4 and Rule 6
- Appendix A: Proposed Amendments to Rule 9-4
- Appendix B: Proposed Amendments to Rule 9-6
- Appendix C: Socioeconomic Impacts Analysis
- Appendix D: Electric Infrastructure Impacts from Proposed Zero NOx Standards
- Appendix E: Assessing Ambient Air Quality and Health Impacts from Natural Gas Building Appliances in the Bay Area
- Appendix F: Exposure and Equity Assessment of Natural Gas Appliances in the San Francisco Bay Area
- Appendix G: Draft Environmental Impact Report
- Appendix H: Response to Comments
The Air District Board of Directors conducted a public hearing on March 15, 2023 and adopted the proposed amendments to Rules 9-4 and 9-6 and certified the CEQA EIR. Information and a recording of the public hearing can be found on this page under 'Hearings, Workshops and Other Events'.
Hearings, Workshops and Other Events
Throughout the rule development process, we provide information on upcoming and past workshops, hearings, and other events.
Documents
Supporting materials, such as staff reports, regulatory language, and other technical documents related to rule development, are posted throughout the development process.
Comments
The Air District provides opportunities for the public to submit comments throughout the development process, and posts comments received during the open public comment periods.
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Last Updated: 08/11/2024