Anaheim, CA Earthquake Safety: Seismic Gas Shutoff (2026)

A seismic gas shutoff valve (also called an earthquake gas valve or excess-flow valve when triggered by line rupture) automatically closes the gas supply to a building when shaking exceeds a set threshold (typically 5.4 magnitude at the location) or when the line senses a sudden pressure drop from a broken pipe. California Health and Safety Code Sections 19200 through 19205 established the legal framework, and California Plumbing Code Section 1210.1.4 requires installation of a listed (ASCE 25 or equivalent) seismic shutoff valve on new buildings and on existing buildings when alteration, remodel, or addition work exceeds 10,000 dollars in valuation at a single site over any 12-month period. The valve must be listed by IAS, UL, or a similar approved agency and installed on the customer side of the gas meter (or at the meter riser in some configurations). Anaheim building inspectors verify installation at the plumbing rough and final inspections. SoCalGas also offers installation guidance and maintains a list of approved valves. After a valve trips, it must be manually reset after confirming no gas leaks inside the building, and most valves should be tested or serviced every several years. The cost to retrofit a typical single-family home with a seismic valve is 250 to 600 dollars including permit and installation. Valves are especially important for properties near the Newport-Inglewood Fault where strong shaking is highly likely.