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Exterior gas meter and shutoff valve on the side of a residential home
Explainer 4 min read

Gas Line Leak Warning Signs and What to Do First

Odor, hissing, dead vegetation over the line, unexplained bill increases - plus the exact safety steps to take first and when to call the utility versus a contractor.

If You Smell Gas Right Now

Stop reading and do this.

  1. Get everyone outside. People and pets, immediately.
  2. Do not touch anything electrical. No light switches, no appliances, no garage door opener, no phone while inside. A spark is the one thing the situation is missing.
  3. Do not light anything. No matches, no lighters, no candles.
  4. Call from outside, a good distance from the building. Gas utility emergency line first, then us.

The utility can shut off supply at the meter and confirm whether the property is safe to re-enter. That is their job and it is free. Ours is the repair afterward, through gas line services.

The Warning Signs

The smell. Sulphur or rotten eggs. Natural gas is odourless, and this smell is an additive put in deliberately so that leaks are detectable. If you can smell it, treat it as real.

A hissing or whistling sound near a gas line, appliance connection or the meter.

Dead or discoloured vegetation in a line running across a yard, especially a stripe of dead grass where the surrounding lawn is healthy. Gas escaping into soil displaces oxygen at the roots. This is frequently the only sign of a buried outdoor leak.

Dirt or dust blowing up from the ground in a small area with no wind explanation.

An unexplained increase in gas usage on your bill with no change in habits or weather.

Physical symptoms. Headaches, dizziness, nausea, fatigue or eye and throat irritation that improve when you leave the house and return when you come back.

Bubbles in standing water over a buried line after rain or irrigation.

Technician using a combustible gas detector along an exposed gas line

Outdoor leaks often have no smell at all

Gas dispersing into soil does not always reach the surface in a concentration anyone notices. Dead vegetation and a rising bill are the indicators that matter for buried lines.

Utility or Contractor?

SituationCall first
You smell gas indoorsGas utility emergency line, from outside
Suspected leak on the street side of the meterGas utility
A carbon monoxide detector has activatedEmergency services, then the utility
Confirmed leak on your side of the meterUs, for the repair
New gas line for a range, pool heater or tanklessUs
Line damaged during diggingUtility immediately, then us

The dividing line is the meter. Everything on the street side is the utility’s responsibility. Everything downstream of it, the house piping and appliance connections, is yours and is what we repair.

What Professional Leak Testing Involves

A combustible gas detector is swept along accessible piping, connections and appliance points, and it reads concentrations far below the threshold a human nose detects.

For the piping system as a whole, a pressure test isolates the line, pressurises it with air or nitrogen to a specified value, and holds it. If the pressure drops over the test period, there is a leak, and the drop rate indicates its magnitude. That test also serves as the verification before a repaired system is returned to service.

Buried lines can be traced and located, and soil probes used to detect gas concentration along the route. It is the same principle we apply to the other buried line on the property, where a sewer camera inspection locates the fault before anyone opens the ground.

Repair, Replacement and New Installation

Beyond emergencies, we handle:

  • Repair of leaking or corroded gas piping
  • Replacement of ageing runs, particularly older black iron showing corrosion
  • New installations for ranges, pool heaters, fire pits, outdoor kitchens and tankless conversions
  • Gas line sizing against actual BTU demand, which matters enormously on tankless water heater conversions where an existing line frequently cannot deliver what the unit needs
  • Pressure testing and leak verification on every job
  • Permitting in both states

Gas work is not a category for shortcuts or unlicensed help. If you have a genuine emergency involving water rather than gas, emergency service covers that side, and the same dispatch board runs both.

Common Questions

What should I do first if I smell gas?

Get everyone outside, including pets. Do not operate any electrical switch, appliance, garage door opener or phone while you are inside, because a spark is the ignition source the situation is missing. Do not light anything. Leave doors open behind you as you go if that is convenient, but do not delay to open windows. Once you are a safe distance away, call the gas utility's emergency line first, then call us for the repair. The utility can shut off supply at the meter and confirm the property is safe.

Can I smell every gas leak?

No, and this is the part most people do not know. Natural gas is odourless and the sulphur smell is an additive put in specifically so leaks are detectable indoors. Buried outdoor leaks frequently disperse into soil without producing a noticeable smell above ground, which is why dead or discoloured vegetation in a line path and an unexplained rise in gas usage are important indicators. Slow indoor leaks can also fall below the threshold most people notice, particularly if you have become accustomed to it.

Do you handle gas line permits?

Yes, in both Arizona and California. Gas line work is permitted work, and pulling and closing the permit is part of the job rather than something left to you. All of our gas work includes pressure testing and leak verification before the system is returned to service.

Need help with sewer & gas lines?

No pressure either way. If you would rather just talk it through with someone who works on these systems every day, the phone lines go straight to our teams.