A gas system pressure test form is the document you file with your local building department to prove that newly installed or modified gas piping holds pressure without leaking. Get the current form from the building department that issued your permit, run the pressure test to the required psig and hold time, fill in every field, and submit it with your inspection request. The utility will not set or unlock the meter until that completed form and a passing inspection are on file.
Where to Get the Form
Your local building department or permit office is the primary source. Many departments post the form as a downloadable PDF on their online permit portal; others hand it out at the counter when you pull a plumbing or mechanical permit. Some utility providers supply their own version as well, particularly if they require a separate pressure test before unlocking the meter. If you cannot find the form online, call the building department with your permit number and ask which version they accept.
There is no universal federal form. Each city or county designs its own, so the layout and specific fields vary. Nearly all of them collect the same core information: the permit number, the property address, the contractor’s license credentials, the test pressure applied, the duration of the hold, and whether the system passed or failed.
Prepare the System Before You Test
Before you touch the form, the piping has to be ready. Every open end must be capped or plugged. Appliance connections should be either tied into their shutoff valves or securely capped. If the system includes a regulator, most codes and manufacturers require you to remove it or isolate it before applying test pressure, because regulators are not designed to withstand elevated pressures.
The test medium matters. Under NFPA 54, the test medium must be air, nitrogen, carbon dioxide, or another inert gas. Oxygen must never be used, and neither should any combustible gas such as propane or natural gas. Using the wrong test medium is a code violation and creates an explosion risk inside the piping.
Your pressure gauge needs to match the test. For a low-pressure test around 3 psig, the gauge needs fine enough increments (typically 1/10 psi or smaller) to detect any drop during the hold. A 200 psi gauge on a 3 psi test will not show small leaks. Many jurisdictions also specify a minimum dial diameter of 3.5 inches for diaphragm gauges used on low-pressure tests.
Required Test Pressure and Hold Time
The International Fuel Gas Code and the International Residential Code both set the baseline: the test pressure must be at least 1.5 times the proposed maximum working pressure, but never less than 3 psig regardless of the system’s design pressure.1International Code Council. 2018 International Residential Code – G2417.4.1 (406.4.1) Test Pressure Most residential systems operate at roughly 1/4 to 1/2 psi (7 to 14 inches of water column), so that 3 psig floor is what actually governs the majority of residential tests.
Hold time varies by jurisdiction. The most common requirement is a minimum of 15 minutes with no perceptible drop in pressure. Some areas extend this to 20 or 30 minutes. For welded piping or systems operating above 14 inches of water column, the test pressure typically jumps to at least 60 psig held for at least 30 minutes. Large commercial systems may require even longer holds at the inspector’s discretion.
Corrugated Stainless Steel Tubing
If the system uses corrugated stainless steel tubing (CSST), check the manufacturer’s maximum test pressure before you pressurize. Gastite, for example, lists a maximum test pressure of 150 psi for 3/8-inch through 3/4-inch tubing, dropping to 40 psi for 2-inch tubing.2Gastite. Design and Installation Guide Exceeding the rated pressure can damage the tubing and void the warranty. For CSST operating above 14 inches of water column, a common code requirement is at least 30 psig held for 30 minutes.
Low-Pressure Manometer Tests
Some jurisdictions allow a manometer or slope gauge for very low-pressure systems instead of a standard dial gauge. In these cases, the inspector may accept a reading in inches of water column or inches of mercury rather than psig. The testing instrument still has to be sensitive enough to catch a minor leak over the hold period. Confirm which method your building department recognizes before you test. Showing up with a manometer reading when the inspector expects a dial gauge reading can mean rescheduling.
Filling Out the Form
With a successful hold behind you, fill in every field before the inspector arrives. Layouts differ, but these sections appear on nearly every version:
- Permit number and property address. These link the form to the correct permit file. Use the exact permit number issued by the building department, not any project number from your own records.
- Owner name. The property owner listed on the permit application.
- Contractor or testing person. Your full name, company name, and state-issued license number. Some jurisdictions allow a homeowner to test their own homestead property, but most require a licensed plumber or mechanical contractor.
- Test pressure applied. Record the exact gauge reading in psig or inches of water column, matching the units the form specifies.
- Test duration. The length of the hold in minutes. Start timing only after the system has stabilized at target pressure.
- Test medium. Indicate whether you used air, nitrogen, or CO₂.
- Pass or fail. Most forms include a checkbox. Mark it honestly; the inspector will verify the result independently.
- Signature and date. The person who performed the test signs and dates. Some forms include a separate signature line for the inspector.
A few jurisdictions also ask for the gauge serial number and its most recent calibration date. Even if your form does not require these fields, having that information on hand shows the inspector you are working with a reliable instrument.
Submitting the Form and Scheduling the Inspection
How you submit depends on your building department. Many now accept digital uploads through their online permit portal, where you attach the completed form directly to your active permit. Others still require a physical copy hand-delivered or faxed to the inspector’s office. Either way, submit the form before or at the time you request the inspection. The inspector needs it on file to know what to verify on site.
Scheduling the inspection usually means calling the building department with your permit number, property address, and a note that you need a gas test inspection. Some departments offer next-day inspections; others take several business days depending on workload. Inspection fees are typically bundled into the original mechanical or plumbing permit fee, though some jurisdictions charge a separate inspection fee. Budget for the possibility of a re-inspection fee if the test fails the first time; these commonly run between $50 and $100 for a return visit.
What the Inspector Checks on Site
The inspector is not just reviewing paperwork. In most jurisdictions, the inspector witnesses a live pressure test, or at minimum verifies that the system is still holding the reported pressure when they arrive. The inspector compares the gauge reading against what you wrote on the form, checks that the gauge is functional and appropriately sized for the test, and inspects the piping for code compliance: proper support, correct materials, adequate clearances from other systems, and correctly installed fittings.
Some inspectors also apply a leak detection fluid to joints and fittings during the pressurized hold. Purpose-made detection fluids are more sensitive than household soap and water, producing visible bubbles within seconds at even small leaks. To catch problems before the inspector arrives, brush detection fluid onto every fitting, valve, and connection point while the system is pressurized and look for bubbling or foaming.
If the system holds and everything checks out, the inspector signs the form and typically leaves a tag, often green, on the gas line or meter location indicating the system passed. That signed form or tag is the authorization that gets transmitted to the utility.
If the Test Fails
A pressure drop during the hold means the system has a leak. The form gets marked as failed, and no further inspection will be scheduled until you fix the problem and retest. The most common culprits are loose or improperly tightened fittings, a missed cap on an open branch line, a faulty valve, or damaged tubing. Under NFPA 54, the affected portion of the piping must be repaired or replaced and the system retested.3UpCodes. 1213.0 Pressure Testing, Inspection, and Purging
Before tearing anything apart, apply leak detection fluid to every joint while the system is still pressurized. That narrows the search considerably. Once you have found and fixed the leak, pressurize again, run the full hold period from scratch, and fill out a new form or amend the existing one per your department’s procedure. Then reschedule the inspection. The re-inspection fee, if your department charges one separately, is usually modest. The real cost of a failure is the delay, especially if you are on a construction schedule waiting for gas appliance hookups.
Getting the Gas Turned On
The utility will not activate the meter without proof that the system passed inspection. In most areas, the building department transmits the approval directly to the utility; in some areas you call the utility yourself and reference the approved permit. Either way, the utility needs to see that a licensed inspector verified the system before gas flows into the piping. After the meter is set or unlocked, the lines need to be purged of air and test medium before any appliances are lit, and appliance connections should be checked for leaks again at operating conditions.
Keeping Your Records
Hold on to your copy of the completed pressure test form, the inspection approval, and any related permit documentation. The building department keeps its own file, but your copy matters if you sell the property and a buyer’s inspector or lender asks for proof that gas work was permitted and inspected, or if an insurance claim ever involves the gas system and your insurer wants proof that the installation was code-compliant and inspected. There is no single national rule on how long to keep these records; the simplest approach is to keep them for as long as you own the property, stored with your other permit and inspection files.