San Diego, CA Earthquake Safety: Seismic Gas Shutoff (2026)

California Health and Safety Code Sections 19200-19204 (Article 7, Seismic Gas Shutoff Devices) establish the framework for seismic gas shutoff valve requirements. These devices automatically close the gas supply when triggered by earthquake ground motion (typically at Modified Mercalli Intensity V or greater). The State of California requires all seismic gas shutoff valves to be certified by the Division of the State Architect (DSA) under California Code of Regulations Title 21, Subchapter 5. San Diego's adopted building code may require installation of seismic gas shutoff valves when: a new gas service connection is established; a major renovation permit triggers compliance upgrades; or the property is in a designated high-seismic-risk area. San Diego Gas & Electric (SDG&E) recommends seismic gas shutoff valves for all customers and provides information on approved devices. Installation must be performed by a licensed plumber and the valve must be accessible for manual reset after activation. The valve is typically installed on the gas supply line at the meter location. Cost for installation ranges from $250-$600 depending on complexity.