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Regulation 11 Rule 18: Reduction of Risk from Air Toxic Emissions at Existing Facilities - 2025 Amendments (Draft)
Learn about the Air District's development process for amendments to Regulation 11, Rule 18, which would update and improve the Rule 11-18 Facility Risk Reduction Program that reduces health risks from toxic emissions from existing local facilities.
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.
The Air District is issuing a Workshop Notice and accepting comments on draft amendments to Rule 11-18. To view or download the documents, please click on the links below or visit the “Documents” section at the bottom of this webpage.
- Notice of Public Workshop and Request for Comments – Draft Amendments to Rule 11-18
- Preliminary Staff Report – Draft Amendments to Rule 11-18
- Draft Amendments to Rule 11-18
- Draft Amendments to Rule 11-18 Implementation Procedures
Comments on the draft amendments to Rule 11-18 are requested by October 13, 2025, at 5:00 PM.
The Air District will also host a virtual public workshop to provide the public with an opportunity to learn about, discuss, and comment on the draft amendments to Rule 11-18. The workshop will be conducted virtually via webcast on October 2, 2025, from 6:00 to 8:00 PM. A registration form to join the workshop is available at this link.
Background
Regulation 11: Hazardous Pollutants, Rule 18: Reduction of Risk from Air Toxic Emissions at Existing Facilities (Rule 11-18) is designed to ensure that facilities emitting toxic air contaminants do not pose unacceptable health risks to nearby residents, workers, or students. Rule 11-18 targets existing high-impact facilities and requires them to implement Risk Reduction Plans (RRPs) which reduce risks through emissions reductions or Best Available Retrofit Control Technology for Toxics (TBARCT). (See the Facility Risk Reduction Program webpage for additional information, and see the Rule 11-18 Risk Reduction Facilities webpage for lists of facilities affected by the rule.)
The Air District is developing amendments to Rule 11-18 to address long-standing concerns about implementation delays, particularly in completing Health Risk Assessments (HRAs), and advance strategies in the Path to Clean Air Community Emission Reduction Plan (PTCA CERP), which call for increased efficiency and transparency in Rule 11-18 implementation. To accomplish this, Rule 11-18 amendments will proceed in two phases:
- Phase 1 (current): focused on procedural improvements and implementation efficiency;
- Phase 2 (future): focused on evaluating and potentially increasing rule stringency.
The Air District published a Rule 11-18 Concept Paper and draft updated Rule 11-18 Implementation Procedures (IP) document in December 2023. The Concept Paper was the initial step in the process of developing amendments to Rule 11-18 to improve procedures and implementation efficiency (Phase 1). The Air District accepted public comments on these documents, and also held a virtual public workshop in February 2024 to discuss and gather comments on these items. See the Facility Risk Reduction Program webpage for these documents and additional information.
Draft Rule Amendment Package
The Air District has published the draft rule amendment package (including the draft rule amendments, draft Rule 11-18 Implementation Procedures, and Preliminary Staff Report) detailing the draft changes to improve program implementation and efficiency. The draft amendments to Rule 11-18 include a number of key procedural changes, including requirements for facilities to submit their own preliminary HRAs for Air District review, correction, and approval; the establishment of detailed steps and timeline for HRA and RRP processes; and other amendments to improve clarity and efficiency. Staff has also developed draft amendments to the Rule 11-18 Implementation Procedures, which includes aligning with the draft amended rule language; improving clarity and readability; and defining the role, scope, and process for the Dispute Resolution Panel (DRP).
- Notice of Public Workshop and Request for Comments – Draft Amendments to Rule 11-18
- Preliminary Staff Report – Draft Amendments to Rule 11-18
- Draft Amendments to Rule 11-18
- Draft Amendments to Rule 11-18 Implementation Procedures
The Air District is accepting public comments on these materials through October 13, 2025 at 5:00 PM. Written and/or email comments may be submitted to:
Or via mail at:
Rule Development
Bay Area Air Quality Management District
375 Beale Street, Suite 600
San Francisco, CA 94105
The Air District invites public feedback on these documents and will consider all input received during the comment period and public workshop toward further development of these amendments. Following the comment period, the Air District will assess the need for revisions before proceeding to a public hearing before the Board of Directors.
Public Workshop
The Air District will host a virtual public workshop to provide the public with an opportunity to learn about, discuss, and comment on the draft amendments to Rule 11-18. The workshop will be conducted virtually via webcast on October 2, 2025, from 6:00 to 8:00 PM.
Simultaneous interpretation is available upon request at least 3 business days prior to the public meeting date. For language interpretation requests, contact jabraham@baaqmd.gov or 415-749-8408.
- Para información en español, llame al 415-749-4609
- 中文聯絡電話 415-749-4609
- Nói Tiếng Việt xin gọi 415-749-4609
Further information on the development of amendments to Rule 11-18 will be provided on this page. Please sign up below to receive future updates on the amendment process for Rule 11-18.
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Last Updated: 8/28/2025