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Regulation 11 Rule 18: Reduction of Risk from Air Toxic Emissions at Existing Facilities - 2026 Amendment (Current)

Reglas y cumplimiento
  1. Distrito de Aire
  2. Reglas y cumplimiento
  3. Rules
  4. Regulation 11 Rule 18

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.

Amendments to Rule 11-18 and updates to the Rule 11-18 Implementation Procedures were adopted by the Air District Board of Directors at a public hearing on June 3, 2026.


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.)

Air District staff proposed amendments to Rule 11-18 to address long-standing concerns about implementation delays, particularly in completing Health Risk Assessments (HRAs), and to 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 are planned to 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.

Rule Amendment Summary

The amendments to Rule 11-18 include measures to expedite the approval of facility-wide Health Risk Assessments (HRAs), as well as other changes that would improve implementation efficiency of this rule. These amendments focus on measures aimed at accelerating risk reduction and improving program efficiency to implement the requirements of the Rule as soon as feasible. The amendments are expected to expedite not only the overall implementation of the Rule but also the reduction of toxic emissions and health risks from affected facilities.

Air District staff also developed updates to the Rule 11-18 Implementation Procedures, which include aligning with the amended rule language; improving clarity and readability; and defining the role, scope, and process for a Dispute Resolution Panel that is expected to hear disputes between refineries and the Air District about technical issues.

The amendments to Rule 11-18 and updates to the Rule 11-18 Implementation Procedures were adopted by the Air District Board of Directors at a public hearing on June 3, 2026. The Board also adopted an Addendum to the previously certified 2017 Environmental Impact Report and a Mitigation Monitoring and Reporting Program pursuant to CEQA. A recording of the public hearing can be found in the 'Hearings, Workshops and Other Events' table below.

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Last Updated: 04/06/2026