Protect your family and property against post-earthquake fires and hazardous gas leaks. We provide California State Architect-certified seismic shutoff valve installation, new appliance gas drops, outdoor kitchen lines, and precision high-pressure safety testing.
The San Francisco Peninsula sits directly between the San Andreas and Hayward fault systems. During a major seismic event (magnitude 5.4 or higher), severe ground acceleration violently shakes foundation walls, frequently shearing rigid threaded black iron gas pipes leading into meters, furnaces, and water heaters. Escaping natural gas ignited by electrical sparks is historically the primary cause of catastrophic structural fires following California earthquakes. An automatic seismic gas shutoff valve (such as Little Firefighter or Pacific Seismic) instantly cuts fuel flow at the meter the moment severe seismic waves strike, stopping fuel before it can feed a structure fire.
Beyond earthquake safety, modern Peninsula homes require significant gas capacity upgrades to support high-demand appliances. Converting to a 199,000 BTU tankless water heater, installing a 60-inch commercial Wolf or Thermador culinary range, adding outdoor fire pits, or feeding an Accessory Dwelling Unit (ADU) often exceeds the flow capacity of original 1/2-inch or 3/4-inch branch lines. Daso Plumbing calculates exact total connected load (CFH / BTU demand) and engineers code-compliant black iron and corrugated stainless steel tubing (CSST) manifolds sized for proper supply pressure without pressure drops.
Gas plumbing is zero-tolerance work. Whether you smell the faint sulfur/mercaptan odor of a gas leak or are completing an extensive remodel, our certified C-36 technicians use calibrated combustible gas sniffers and electronic manometer pressure drop gauges to test systems at 15+ PSI. We coordinate all municipal permit filings with local Peninsula building officials, conduct pressure tests with city inspectors, and interface with PG&E to safely restore and tag gas service.
Automatic seismic motion-sensing gas shutoff valves installed directly downstream of your PG&E meter to prevent post-quake fires.
Dedicated gas supply line runs for high-BTU tankless water heaters, commercial culinary ranges, pool heaters, and clothes dryers.
Calibrated electronic gas leak sniffers and bubble-solution testing to locate hidden leaks in walls, crawlspaces, and meters.
Weather-resistant underground polyethylene (PE) gas lines for exterior living spaces, patio fire tables, and outdoor kitchens.
High-capacity welded and threaded gas manifolds designed for commercial kitchens, multi-family boilers, and tenant improvements.
Full turnkey permitting, pressure testing, and coordination with local building departments and PG&E utility crews.
Photographed on Peninsula jobs by the crews who did the work.
Our licensed crews operate from Belmont, dispatching fully equipped service vehicles to residential and commercial properties throughout San Mateo and Santa Clara counties.
Send the scope, the address, or just the problem. A licensed plumber reviews it and comes back with a written price — not a range.
