Short definition

The main gas shutoff is the manual quarter-turn valve at the gas meter on the outside of your home. With a 12-inch crescent wrench (or a dedicated gas wrench), turning the valve a quarter-turn so the handle is perpendicular to the pipe closes gas to the entire house. Every adult and older teen in the household should know where it is and how to operate it.

What it is

A gas meter sits on the outside of every gas-served WA home, typically at the side or back. Just downstream of the meter is a small ball valve with a rectangular operator that takes a wrench. With the operator parallel to the pipe, gas is flowing. With the operator perpendicular to the pipe, gas is closed.

That valve is yours to operate in an emergency. The meter and the valve are utility property, but the manual shutoff exists explicitly so customers can stop the gas in seconds — no utility wait time, no permit, no debate.

The valve is required at every meter under federal pipeline-safety rules (49 CFR Part 192). PSE, Cascade Natural Gas, Avista, and NW Natural all publish customer guides showing the location and operation.

A dedicated gas-meter wrench is $10–$25. A 12-inch adjustable wrench works in a pinch. The best practice is to hang a wrench at the meter — zip-tied or wired so it can’t disappear and is always there when you need it.

Why it matters to a homeowner

The first step in every gas-leak response and every post-quake check is “close the meter valve.” Knowing the location, identifying the right valve (not the appliance shutoff), and understanding the quarter-turn rule is the difference between a controlled response and a panicked search.

For a real-world Cascadia event: power may be out, the house may be dark, and you’re moving fast. The valve is a 5-second action if you’ve practiced it once a year and pre-positioned the wrench. It’s a 15-minute fumble if you haven’t.

This is one of the most clearly DIY-acceptable safety actions in the entire glossary. Closing the valve in an emergency is your job and only your job. The cautionary half: re-opening the valve after a closure should usually be left to the utility, because re-pressurizing without verifying every appliance shutoff is closed and every pilot is off can re-flood the house with gas.

When you’ll encounter this term

  • Smell of gas in the house
  • After a Cascadia event, before any electrical or appliance work
  • A major remodel — homeowner-arranged shutoff isn’t strictly needed, but knowing the location matters
  • Annual practice with the family — once a year, locate the meter, find the wrench, run through the quarter-turn rule

How to do it

  1. Locate your meter. Outside the house, typically a side or back wall. In some older homes, the meter is in a basement or utility room.
  2. Identify the manual shutoff. It’s the small valve immediately downstream of the meter (between the meter and the house), with a rectangular operator that takes a wrench. Not the regulator; not an appliance shutoff inside the house.
  3. Use a wrench. A dedicated gas-meter wrench is best. A 12-inch crescent works.
  4. Turn the valve a quarter turn. When the operator is parallel to the pipe → open. Perpendicular to the pipe → closed.
  5. Don’t re-open without the utility. Re-pressurizing without a check can refill the house with gas. Wait for the utility re-pressurization service.

If the valve is stuck, do not force it with a cheater bar. A sheared meter valve is a worse leak than the one you’re trying to stop. Call the utility’s emergency line and let them replace it.

Common failure modes

  • Wrench not pre-positioned. Homeowner can’t find a wrench during an emergency. Best practice: hang one at the meter.
  • Stuck valve that hasn’t been operated in 20 years. Utility can replace; do not force.
  • Wrong valve operated. Closing the appliance shutoff thinking it’s the meter valve. Different scope; if the leak is upstream of the appliance shutoff, only the meter valve helps.
  • Closed valve, then re-opened by homeowner. Re-pressurization without verifying every pilot and every open valve in the house can flood the home with gas. Best practice: utility re-pressurization only.
  • Meter buried or blocked by landscape. Common in older WA homes. Resolve before an emergency, not during.

Common variants and disambiguation

  • Manual meter shutoff (utility-owned, downstream of meter) — the one to use in emergencies.
  • Earthquake (seismic) gas shutoff — automatic; trips on shaking. Separate device. See earthquake gas shutoff.
  • Excess-flow valve — automatic; trips on a sudden flow surge. Some utilities install one at the meter.
  • Appliance shutoff — at every individual appliance. Useful for working on that appliance, not for whole-home leak response.

Washington note

Federal rules (49 CFR 192) require the shutoff valve at every WA meter regardless of utility. PSE, Cascade Natural Gas, Avista, and NW Natural each publish customer-facing guides on locating and operating the meter shutoff — verify the current PSA at your utility’s website.

In a major event, the utility will be backlogged. Knowing how to close the valve yourself is the bridge between “now” and “when the utility arrives.” After a Cascadia M6+ event, expect multi-day waits for re-pressurization service.

This is a homeowner action. There is no permit, no license, no DIY restriction on closing your own meter shutoff in an emergency. Re-opening, however, is best done by the utility — they pressure-test the system before service resumes.

FAQ

Where is the gas meter on my house?

Outside, typically at a side or back wall, usually at chest height. Older homes occasionally have it in a basement. If you can’t find it, the gas bill or your utility’s customer service can tell you. Don’t wait for an emergency to look.

Should I shut off the gas after every earthquake?

After a small or moderate quake (you felt it but nothing fell, no smell of gas, no visible damage): no, leaving gas on is fine. After a major event (M6+, structural damage, smell of gas, visible pipe damage): yes, close it. If you have an earthquake gas shutoff valve, it should have closed itself; the manual valve is a backup.

Can I just close the appliance shutoff instead?

Only for that one appliance. The meter shutoff stops gas to the entire house. If the leak is upstream of an appliance shutoff (in a wall run, at a tee, at the meter side of any appliance), the appliance shutoff doesn’t help. Use the meter shutoff for whole-home emergencies; appliance shutoffs are for working on a specific appliance.