Seismic Gas Shutoff: Berkeley vs San Leandro
How do seismic gas shutoff rules compare between Berkeley, CA and San Leandro, CA?
San Leandro has fewer restrictions than Berkeley.
Berkeley, CA
Alameda County
BMC 19.34.040 requires installation of a listed motion-activated seismic gas shut-off valve in every newly constructed building containing fuel gas piping, and in existing buildings whenever a mechanical or plumbing permit is issued for any addition, alteration, or repair on a single-meter gas service.
View full Berkeley rules →San Leandro, CA
Alameda County
California Health and Safety Code 19200-19205 and California Building Code 1.8.5 require seismic gas shutoff valves for certain new construction and major alterations. In San Leandro, PG&E and the City Building & Safety Division enforce these triggers under SLMC Title 7 Chapter 7-5.
View full San Leandro rules →Key Facts Comparison
| Fact | Berkeley | San Leandro |
|---|---|---|
| Code Section | BMC 19.34.040 | - |
| New Construction | Valve required on all fuel-gas piping | - |
| Existing Buildings | Required at any mech/plumbing permit (single meter) | - |
| Activation Threshold | Seismic event > ~M5.0 / ~0.3 g PGA | - |
| Mounting | Rigid to building unless mfr. specifies otherwise | - |
| State Law | - | Cal. H&S Code 19200-19205; CBC 1.8.5 |
| Standard | - | ASCE 25-certified valve |
| Trigger - Alteration | - | $10,000+ and gas piping work |
| Installation Location | - | Downstream of PG&E meter |
| Typical Cost | - | $200 - $700 installed |
Highlighted rows indicate differences between cities.
Berkeley FAQ
Do I need a seismic gas valve to replace my water heater in Berkeley?
Almost always yes. BMC 19.34.040 requires a listed motion-activated gas shut-off valve whenever any mechanical or plumbing permit is issued for a single-meter building — water heater, furnace, and HVAC replacements all trigger the requirement.
Where does the valve get installed?
On the customer side of the gas meter, rigidly mounted to the building unless the manufacturer's listing allows otherwise. It must be accessible for manual reset after a quake.
What triggers the valve to shut off?
Listed valves close automatically during seismic shaking above roughly magnitude 5.0 (about 0.3 g peak ground acceleration). They must then be manually reset after gas service is verified safe.
San Leandro FAQ
Do I need a seismic gas shutoff valve in my San Leandro home?
Only if your project triggers California Building Code 1.8.5 — typically a permitted alteration exceeding $10,000 that includes gas piping work, or new construction. Existing homes are not retroactively required to install one, but it is strongly recommended given the proximity of the Hayward Fault.
Who installs seismic gas shutoff valves in San Leandro?
Licensed C-36 plumbing contractors install the valve downstream of the PG&E meter. PG&E does not install the valve itself. The Building & Safety Division at 510-577-3405 will inspect installation as part of any required permit.
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