During a general home inspection, gas line and meter safety is checked visually and non-invasively: the inspector looks at accessible gas piping, the meter and main shutoff, any earthquake (seismic) valve, appliance connectors, and signs of corrosion or improper CSST bonding. We report visible defects and the smell of gas, but confirming a leak is the gas utility’s job – not ours.
Why gas safety matters in San Diego homes
San Diego County runs on natural gas for furnaces, water heaters, ranges, dryers and pool heaters, and a lot of our housing stock is old enough that the gas system has been worked on – sometimes well, sometimes not. Coastal corrosion from El Nino-driven salt air in places like Ocean Beach, La Jolla and Encinitas attacks exposed steel piping and fittings. Inland, the bigger concern is seismic: we sit near several active faults, and an unsecured water heater or a gas riser without an earthquake shutoff valve is a real fire risk after a quake.
A home inspection is one of the few times all of these systems get looked at together by someone whose only job that day is to find problems. It is a snapshot, though – a visual review of what is accessible and operating on inspection day, not a code-compliance certification or a pressure test. Here is exactly what an inspector is – and isn’t – checking.
The gas meter and main shutoff
The inspection usually starts at the meter, which on most San Diego properties is on an exterior wall or in a side yard. The inspector confirms the meter is accessible, reasonably secure, and not obviously damaged, leaking at the fittings, or buried under landscaping. We also look for the main gas shutoff valve – the quarter-turn valve at the riser, next to the meter – and confirm a homeowner could reach and operate it in an emergency.
This matters more than people think. After an earthquake or if you ever smell gas, you need to turn that valve a quarter-turn perpendicular to the pipe to stop the flow. We routinely find meters boxed in by decks, fences or storage where nobody could get to the shutoff in a hurry. That is a safety note worth acting on.
Earthquake (seismic) gas shutoff valves
An earthquake gas shutoff valve automatically cuts gas to the house when it senses strong shaking, which dramatically reduces post-quake fire risk. Some San Diego jurisdictions require one at the time of certain remodels, water heater replacements or property transfers, and some insurers favor them. The inspector notes whether a seismic valve is present, whether it appears correctly installed downstream of the meter, and whether it has been tripped.
If your home doesn’t have one, that’s not a defect – it’s an upgrade opportunity. We’ll point it out so you can weigh it. Whether one is required for your specific transaction or remodel is a question for the gas utility, the local building department, or your agent.
Visible gas piping and corrosion
The inspector traces accessible gas piping – typically black iron or steel, and in many newer or remodeled homes, yellow corrugated stainless steel tubing (CSST). We are looking for:
- Corrosion and rust, especially on exterior runs and risers exposed to coastal air, irrigation overspray or standing moisture in crawlspaces and side yards.
- Improper support – piping that sags, isn’t strapped, or runs through framing without protection.
- Unsafe materials or routing, like flexible appliance connectors run through walls or floors where they shouldn’t be.
- Abandoned or capped-off gas stubs from removed appliances – an open, uncapped line is a real hazard we flag immediately.
- Signs of amateur work – mismatched fittings, rubber hose used as gas line, or unpermitted-looking additions to the system.
What we cannot see, we cannot inspect. Gas lines buried underground, hidden inside finished walls, or running under slabs are concealed – a general inspection does not include excavating, opening walls, or pressure-testing the system. That’s a hard limit of any visual inspection, and a good inspector tells you where the inspection stops rather than pretending otherwise. We cover that in detail in our guide to what a home inspection doesn’t cover.
CSST and proper bonding
That flexible yellow (or sometimes black-jacketed) corrugated stainless steel tubing is common in San Diego homes built or re-piped in the last couple of decades. CSST is convenient and code-accepted, but it has a known vulnerability: a nearby lightning strike or electrical fault can arc to the tubing and puncture it, causing a gas leak and fire. The defense is correct bonding and grounding – tying the gas system to the home’s grounding electrode system with an approved bonding clamp and conductor.
The inspector looks for the presence of CSST and whether a bonding connection appears to be in place where it’s visible. Missing or questionable CSST bonding is one of the more common – and more consequential – gas findings we write up. Verifying and correcting it is work for a licensed plumber or electrician, and any repair should be permitted and re-inspected.
Appliance connectors and the smell test
At each gas appliance – furnace, water heater, range, dryer, pool or spa heater – the inspector checks the flexible connector and shutoff valve for the right type, obvious damage, kinks, or an appliance that has been moved far enough to over-stretch the connector. We confirm a dedicated shutoff is present at the appliance.
If we smell gas during the inspection, we note it and recommend you contact SDG&E right away. We do not chase down or repair leaks. Inspectors may use a simple combustible-gas detector as a courtesy, but that is a screening tool, not proof. Confirming and locating an actual gas leak is the utility’s responsibility – SDG&E will come out, and if you ever smell that rotten-egg odor, leave the house and call them or 911 from outside. Carbon monoxide from incomplete gas combustion is a related danger, which is why working detectors matter; see our overview of California’s smoke and carbon monoxide detector requirements.
Where the inspection ends – and who to call
To be clear about scope: a general inspection is a visual, non-invasive review. It is not a pressure test, a code certification, or a guarantee that the gas system is leak-free. For anything beyond observation, you bring in the right licensed pro – SDG&E for the meter and suspected leaks, a licensed plumber for piping and CSST repairs, and the building department for permits on upgrades like a seismic valve.
If you’re buying, gas safety is one piece of a much bigger picture, and it’s exactly the kind of thing a thorough buyer’s inspection is built to catch before you close. Have questions about what we check or want to see a redacted report first? Reach out to The Real Estate Inspection Company at (619) 752-4399 – owner-inspector Joseph Romeo is an InterNACHI Certified Professional Inspector serving all of San Diego County. Always verify findings with the appropriate licensed professional before acting.
