Rotten-egg smell in the house? Get everyone out first. Standing in the yard, call SoCalGas on 1-800-427-2200. Injuries or real danger mean 911 as well. Repairs come later, and gas piping is a contractor's job, not a weekend project. Citrus Belt Plumbing arranges a local plumber for gas work across Anaheim, Fullerton, Orange and nearby cities. Below: what the law says about who may do it, when a city permit enters the picture, and the yearly backflow test that water suppliers require.
Who is allowed to work on gas piping in a house?
A contractor with a current state license, and for appliance gas lines at a house that is usually a plumbing contractor. The state licensing board starts at $1,000, labor and materials added up, and permit work is covered at any value. New or altered gas piping almost always involves a permit.
That is a legal line, not a tip. Do not move a gas dryer connector, add a branch to a range, or swap a water heater gas valve yourself and call it done. The failure mode of gas work is quiet: a slow leak, an unlit pilot, poor combustion air. Look the contractor up on cslb.ca.gov and ask who applies for the permit.
Related reading: the gas line plumber page, what gas line work costs, and the guide to a flexible natural gas line.
What happens if I smell gas in my house?
Walk out right away and take everyone, pets included. Leave the lights, switches and appliances alone, light no flame, and keep the car in an attached garage switched off. SoCalGas takes the call at 1-800-427-2200, made from a safe distance. If you feel dizzy, hear hissing or sense danger, use 911 as well.
The utility, not a plumber, gets the first call about a suspected leak. After SoCalGas has made the situation safe, a contractor can trace the cause: a corroded fitting, a cracked connector, a tired appliance valve.
After a quake the same rule applies. The valve is the subject of how to reset an earthquake shutoff and the page on the emergency gas valve after an earthquake.
When does plumbing work in Orange County need a permit?
Jobs that alter pipe or gas, and any water heater replacement, generally go through the city building division. Anaheim's bulletin on water heaters says approval is needed for new or relocated units. Fullerton, Orange, Brea and their neighbors each have a building division of their own, with their own forms and fees.
Build the permit step into the schedule. The contractor usually applies, and the city may inspect afterward. A faucet swap generally needs none; gas lines, water heaters and repipes do. On a water heater swap, inspectors commonly look at strapping, the relief valve discharge and the gas connection.
To confirm, contact your own city's building division before buying equipment, because rules and fees vary by city. The guide to a water heater permit goes into more detail.
How does a backflow test work, and does my property need one?
A backflow test proves that the valve guarding the public water supply still stops used water from creeping backward into clean pipes. State regulations call for a yearly test, and your water supplier sends the reminder. Irrigation systems, fire lines and many commercial buildings carry one.
State rules in Title 17 require at least one test per year, with more where the health agency or supplier wants it. The notice carries a deadline, and the supplier keeps the paperwork. Common devices are reduced pressure and double check assemblies, and the tester reads a gauge kit to see how the valves hold.
Which testers count is decided locally. The State Water Board notes that the regulations do not themselves certify testers, so your supplier decides what proof of competence it accepts. Ask it for a list. For the sequence step by step, go to how to do backflow testing and backflow prevention testing.
How much do a gas inspection and a backflow test cost?
The yearly backflow test is the predictable cost: published California quotes mostly sit near $75 to $200 per device, with some Orange County contractors listing about $90. If a device fails, published guides put the fix at roughly $100 to $500, and a full replacement costs more. Consider all of this a guide.
Gas work has no flat price. Swapping an appliance connector and running a new branch to a patio are different jobs, so the plumber prices what is actually there. How those quotes break down is covered in plumber inspection cost and backflow assembly testing cost.
What moves a quote: how many devices there are, how old they are, whether the test passes first time, how far new gas pipe must run, and whether permit and inspection fees sit inside the figure.
Common questions
How long does one backflow test last?
Often under an hour per residential device once the tester can reach it, though that varies by site. The tester closes the water, connects a gauge, runs the sequence and writes down the readings. A failed device adds repair time. The report then goes to the water supplier.
What do I ask first before hiring for gas work?
Request the license number and look it up on the state board's site. Find out if the permit sits in the price, who books the inspection, what the paper quote covers, and how corrosion or an unsafe old connector found mid-job would be handled.
Must I be at the property for gas or backflow work?
For gas work, generally yes. Somebody over 18 should be around to switch off appliances, approve the plan and meet the inspector. For an outdoor backflow test, what matters is access to the device and the water shutoff, so ask when booking.
Can a plumber check gas pressure and leaks?
Yes. A plumber can pressure-test piping and use detection gear to find a leak. A suspected leak still starts with getting out and calling SoCalGas, and the contractor repairs whatever the utility has shut off afterward.
Need a visit? Put the gas or testing job into the quote page, and check the areas we serve for coverage.
More in this guide
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- Permits, codes and inspections
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- Costs
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Sources
- Contractors State License Board, contractor license guide
- California Code of Regulations Title 17, section 7605, testing and maintenance of backflow preventers
- State Water Resources Control Board, Cross-Connection Control Policy Handbook
- City of Anaheim, Water Heater Replacement or Relocation bulletin
- Published California backflow test prices from several contractors, checked November 2026
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