Not for the health inspection, and not on a yearly calendar. In Phoenix, a restaurant's gas piping gets a city inspection and pressure test when it is installed or altered, and Southwest Gas checks it for leaks before turning gas on. The fire code's recurring check is the hood suppression system, which must shut off the cooking gas.
Does the health inspection check the gas?
No, the county health inspection does not check the gas piping. It and the county's plan review cover food safety and the plumbing that supports it. Maricopa County Environmental Services' plan review guide for food establishments covers restrooms, hand sinks, three-compartment sinks, water heaters, hot water at every sink, and NSF equipment. Its general line on building systems is that "All finishes, lighting, plumbing, and ventilation must meet current requirements." The word gas does not appear anywhere in the 26-page guide.
The guide also says it "is not all-inclusive and serves only as a guide," and points owners to "current applicable health, building, plumbing, and safety codes." That's where gas lives. For a restaurant in Phoenix, those are the city's fuel gas code, enforced by Planning and Development, and the Phoenix Fire Code, enforced by the Fire Department.
Our page on restaurant plumbing health inspection requirements covers what the health inspector does check.
When does the city inspect a restaurant's gas piping?
The city inspects gas piping when it is new or changed, as part of a building permit. Phoenix enforces the 2024 International Fuel Gas Code, and Section 406.1 says "Prior to acceptance and initial operation, all piping installations shall be visually inspected and pressure tested." Phoenix's list of commercial inspection types includes a dedicated one for it: inspection 235, gas piping, alongside 254, kitchen exhaust.
For an existing building, the City of Phoenix gas clearance table, published with Southwest Gas and the Arizona Corporation Commission, sets out when a permit, city inspection, and gas clearance are required. The rows a restaurant runs into most:
| Situation | City permit, inspection, and gas clearance? |
|---|---|
| New gas piping, like a line for an added fryer or a patio heater | Yes |
| Changes to existing piping, other than installing an appliance connector | Yes |
| Meter locked by Southwest Gas for a leak on the customer side | Yes |
| Repairs where the gas was shut off at the building | Yes |
| An equipment upgrade that adds BTU load and needs pipe sizing | Yes |
| Swapping an appliance in kind on its connector, with no piping change | Not listed as needing one |
A tenant improvement for a new restaurant almost always lands in the first rows, because the cooking line, water heaters, and any patio heaters get new or relocated piping.
The code also has rules aimed at commercial kitchens specifically:
- Connectors for movable equipment. Section 411.1.1 says commercial cooking appliances on casters, and appliances that are moved for cleaning, must use a connector listed to ANSI Z21.69/CSA 6.16, and "Movement of appliances with casters shall be limited by a restraining device."
- A shutoff for each appliance. Section 409.5.1 puts each appliance's shutoff valve in the same room and within 6 feet of it. A valve behind movable cooking equipment counts as accessible.
- The pressure test itself. At least 1.5 times the working pressure and never below 3 psig. Section 406.5 treats any drop on the gauge as a leak unless another cause is clear.
What does Southwest Gas check before it turns the gas on?
Southwest Gas checks that the customer's piping is tight before it opens the meter. Its Arizona tariff makes the customer responsible for a "leak tight system for receiving gas," and it runs a leak check when service is turned on. If uncontrolled leakage exists, service is denied. The tariff also says the utility "may also refuse service until a certificate executed by an authorized public official or licensed plumber is issued" for the system.
That is the moment a restaurant most often needs a gas test on short notice. Common triggers:
- A new tenant opening in an existing space, especially one where the gas has been off between tenants.
- After a red tag, when Southwest Gas locked the meter for a leak on the customer side.
- After a shutoff at the building for repairs.
A test done before the turn-on appointment finds problems while there is still time to fix them. A failed turn-on can push an opening date.
What does the fire code require for gas in a commercial kitchen?
The fire code's gas requirement for restaurants centers on the hood fire suppression system. Phoenix adopted the 2024 International Fire Code with local amendments, effective February 17, 2026. Section 904.14.2, a local amendment Phoenix first adopted in 2013, says: "The actuation of the fire-extinguishing system shall automatically shut down the fuel and electrical power supply to the cooking equipment. The fuel and electrical supply reset shall be manual."
In practice, that means a gas shutoff valve tied to the hood system. When the system discharges, the valve closes and the burners go out. Someone has to reset the valve by hand before cooking starts again, and any pilots that went out have to be relit.
The recurring checks come from the same section:
| Fire code item | What it requires |
|---|---|
| Suppression system service | "not less frequently than every six months and after activation of the system" |
| Who inspects | "qualified individuals," with a certificate of inspection sent to the fire code official |
| Fusible links and sprinkler heads | Replaced annually |
| Changed cooking lineup | New media, moved equipment, or replaced equipment brings the system up to current rules |
In Phoenix, those third-party inspection reports go to the Fire Department through an online tool called The Compliance Engine. A Fire Department inspector reviews each report and follows up with the business on anything deficient.
So the fire inspection does involve the gas, but through the shutoff, not a leak test of the piping. A good service visit confirms the gas valve actually closes when the system trips. That's the part that keeps a hood fire from being fed.
### What about a cooking line that gets rearranged?
Moving or swapping equipment has consequences on both sides. On the fire side, Section 904.14.5.1 says that changes in "the cooking media, positioning of cooking equipment or replacement of cooking equipment" require the suppression system to comply with current rules, so the nozzles may need to move. On the gas side, a new appliance on its listed connector is simple, but new or relocated piping is permit work with a pressure test. Plan both before the new fryer arrives.
When should a restaurant order a gas leak inspection anyway?
Order one whenever someone will ask for proof, or whenever the gas system has been disturbed. None of these is an annual code requirement, but each is a common reason restaurants call:
- Before a Southwest Gas turn-on in a space that has been vacant or shut off.
- After any gas smell in the kitchen, once Southwest Gas has made the area safe.
- After the hood system discharges, if gas equipment was moved or connectors were disturbed during cleanup.
- When buying or leasing a space with an existing cooking line, especially older equipment on worn connectors.
- When a landlord, lender, or insurer asks for a written test result.
If the kitchen smells like rotten eggs, don't wait for a test. Get people out, and call 911 and Southwest Gas at 877-860-6020 from outside. Our page on a gas smell in a restaurant covers how to tell a gas leak from sewer gas.
HQ Plumbing & Air installs and repairs commercial gas piping across the Phoenix area, and our gas leak inspection service includes pressure testing and a written certification letter when the system passes. We're licensed and insured, with free estimates and the price up front.
Health inspector: no gas. City: every new or changed pipe. Fire code: the hood shutoff, twice a year.