You Smell Gas in Your California Home: Who to Call, What the Utility Does Free, and Where the Plumber Comes In
If you smell that rotten-egg odor right now, stop reading and do this first: get everyone and every pet out of the building on foot, leaving doors open behind you as you go. Do not flip any light switch on or off, do not unplug anything, do not use a phone, flashlight, garage-door opener or doorbell inside, do not start a car in an attached garage, and do not try to find or fix the leak yourself. From well away from the building, call 911 if the odor is strong, if you hear hissing, or if anyone feels dizzy — then call your gas utility. If the smell is faint and localized, calling the utility alone is the normal path. Both PG&E and SoCalGas tell customers explicitly that a cell phone counts as an ignition source, so make the call from the sidewalk, not the kitchen.
The three numbers, and who covers your address
The emergency line belongs to your distribution operator, not to a general customer-service queue. Taken from each company's own safety pages: PG&E — 1-800-743-5000, SoCalGas — 1-800-427-2200, SDG&E — 1-800-411-7343. Two points of confusion worth clearing up: "SoCalGas" and "Southern California Gas Company" are the same utility, not two options; and some California areas are served by Southwest Gas, which the California Public Utilities Commission lists alongside the big three. If you're unsure who bills you, the emergency number is on your gas bill and usually on a sticker at the meter. All of these lines are staffed 24 hours a day, seven days a week.
SDG&E states plainly on its gas-leak page that this service is free. PG&E and SoCalGas don't attach a price to it either — SoCalGas publishes that it will "send a trained technician to investigate," and that if the leak is on SoCalGas-owned piping, the technician makes the repair. Hesitating over a call-out fee is the wrong instinct here. The bill, when there is one, comes later and from someone else.
The meter is the boundary — and it's a billing boundary too
This is the single fact that determines who pays. PG&E's language is unambiguous: it delivers natural gas up to and including the gas meter, and "customers are responsible for the maintenance of customer-owned piping on their property" — which it does not typically maintain or inspect. SDG&E frames it the same way. SoCalGas states the consequence directly: if leakage is found on its piping, the technician repairs it; if leakage is found on customer-owned house piping, gas service may be left off until the customer repairs it.
"Customer-owned" is broader than most homeowners expect: not just the pipe in your walls, but the buried run from a curbside meter to the house, the branch out to a pool or spa heater, the line to a detached garage, ADU or barbecue, and the flexible connectors at each appliance. If your meter sits at the property line rather than against the wall, a substantial length of buried pipe belongs to you.
What "red-tagged" means and why the gas stays off
When the technician finds an unsafe condition downstream of the meter, they shut the gas off and leave a tag — commonly a red one — on the meter or on the offending appliance, and nobody but the utility removes it. A tag on a single appliance isolates that appliance; a tag on the meter means the whole house is off, water heater and furnace included. Our guide on what to do when a water heater gets red-tagged in California covers the appliance-level version, including the venting and combustion-air failures that trigger it. The utility will not restore service on your word that it's fixed; it comes back when the house-side system has been repaired and proven tight — which is where a licensed plumbing contractor enters, at your cost.
What the plumber actually does
A gas call is diagnostic before it is anything else. Expect roughly this sequence: sweeping accessible piping and every fitting with a combustible-gas detector to narrow the location; closing valves to isolate the system into sections so the leaking branch can be identified rather than guessed at; then a pressure test — the system is capped, pressurized with air, and watched on a gauge for a defined period to prove there's no drop. That test is the objective evidence an inspector and the utility both want; our breakdown of gas line pressure test cost in California explains how it's performed and priced as a standalone job.
Then the repair: replacing a corroded nipple or union, cutting out and re-running a section, or repiping the affected branch in older homes with badly corroded galvanized or black iron. Anything beyond a fitting-level fix generally means a permit and a re-inspection from your city or county building department before the utility will turn the gas back on. Two adjacent cases come up constantly: a dead branch feeding an appliance you no longer own is cheaper to kill than to fix — see capping or abandoning a gas line — and if a section must be re-run anyway, the pricing logic follows gas line installation cost in California.
What moves the price
Treat any figure you see online, ours included, as a broad range rather than a quote. The dominant variable is not the pipe — it's access. A leaking fitting at an exposed appliance connection is a short, inexpensive visit. A leak inside a finished wall, under a slab or in a buried yard run is a different job, because opening and closing the wall or trench is most of the labor; those routinely land in four figures. Other drivers: the number of sections that fail the pressure test (one bad branch versus a system-wide failure pointing to a repipe), pipe material and age, the permit and inspection fee in your jurisdiction, and whether the work is after-hours — see emergency plumbing pricing. If the water heater was the failing appliance, water heater repair costs and gas line work pricing stack on top. While you wait, this checklist for the waiting period covers what to do and what to leave alone.
Clearing the tag, in order
The sequence rarely varies: a licensed plumbing contractor repairs the failing section, the system passes a pressure test, the building inspector signs off the permit where one was required, and only then do you call the utility back to unlock the meter, relight the appliances and verify they burn correctly. Skipping the inspection step is the usual reason a second utility visit gets wasted. Two things are worth adding while the pipe is already open and the labor is largely paid for: an earthquake gas shutoff valve, cheapest to fit when a plumber is already at the meter and required by some California jurisdictions on certain work, and — if the tag came from a combustion problem rather than a pipe leak — detector coverage that meets the California carbon monoxide detector law for homes with gas appliances.
Don't wait for the smell to get strong
The research argues for calling early rather than sniffing again tomorrow. A 2022 study by Lebel, Finnegan, Ouyang and Jackson in Environmental Science & Technology measured methane in 53 homes and found that more than three-quarters of the methane emitted by gas stoves came while the appliance was switched off — steady, unnoticed seepage rather than dramatic events (DOI 10.1021/acs.est.1c04707). A companion California study by Lebel, Michanowicz, Shonkoff and colleagues analyzed 185 gas samples from 159 California homes and detected benzene in 99% of them (DOI 10.1021/acs.est.2c02581), and a 2024 analysis in Environmental Research Letters covering 587 samples from 481 residences found benzene content varies enormously by region, Los Angeles among the highest averages measured (DOI 10.1088/1748-9326/ad416c). None of that changes the emergency procedure. It does mean a faint, intermittent odor you've lived with for a week deserves a phone call, not a shrug.
One last distinction that saves confusion: natural gas is odorized to smell like rotten eggs or sulfur and is usually strongest near an appliance or the meter, while a sewage-like smell rising from a drain or an unused bathroom is a different problem with a different fix — see our guide to sewer gas smells in the house. When you genuinely can't tell which one it is, treat it as natural gas, leave, and let the utility decide. That determination costs you nothing. If the leak turns out to be on your side of the meter, the repair, the pressure test and the permit are yours — request a free quote and we'll connect you with licensed plumbers in your California city.
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