San Marcos homes get natural gas from SDG&E, and the city's fire department points residents to SDG&E's gas safety guidance: leave the area, then call 911 and SDG&E at 1-800-611-7343 from somewhere safe. For repairs and new gas lines on your side of the meter, call the number on this page to be connected with a local plumber in San Marcos.
San Marcos has a young housing stock for the county, with a median build year around 1994. Most gas calls here aren't about worn-out pipe; they are about adding lines for outdoor kitchens, fire features, pool heaters and tankless water heaters, plus the occasional damaged connector or leaking valve. Whatever the job, safety comes first.
What to do right now
- If you smell gas, get out. Don't flip lights, unplug anything or use a phone inside. Leave the door open behind you if it's easy.
- Call from a safe distance. Dial 911 and SDG&E at 1-800-611-7343.
- Let SDG&E make it safe. The utility checks for leaks and may shut off service at the meter.
- Book the repair. If the leak is on your side of the meter, a plumber fixes the piping and pressure tests it before gas is restored.
- Don't relight yourself after a shutoff. Leave restoring service to SDG&E or a qualified professional.
Symptoms and what they usually mean
| Symptom | Likely cause |
|---|---|
| Faint odor near the range or dryer | Loose fitting or worn connector behind the appliance |
| Hiss at the meter or a yard valve | Leaking union or valve packing |
| Orange, lazy burner flames | Dirty burner, air mixture problem or low supply pressure |
| Tankless heater shuts down under heavy use | Supply line too small for the unit |
| Soot around a water heater vent | Poor combustion or venting issue |
| Brown strip of lawn over a buried run | Underground leak |
What affects the cost
- Distance from the meter and the route, especially in two-story San Elijo Hills homes
- Whether the existing main line has to be upsized for new loads
- Trenching through hardscape for a patio or pool line
- Number of valves and connections
- Permit and inspection through the City of San Marcos Building Division at 1 Civic Center Drive
- Restoring stucco, drywall or landscaping
Ask the plumber to walk you through how the permit and final inspection will be scheduled before work begins. On a newer home, much of the cost of an addition comes from routing and finish work rather than the pipe itself, so a clear path through the garage or attic helps keep the job simple. If the house still has its original appliance connectors from the 1990s, it is sensible to replace them while the plumber is there.
Gas Line Services questions in San Marcos
What should I do the moment I smell gas?
Can gas be piped to a barbecue island, fire pit or pool or spa heater?
Does switching to a tankless gas water heater mean a bigger gas line?
Is an earthquake-actuated gas shutoff valve worth installing?
More plumbing services in San Marcos
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