Gas Leak Emergency: Safety Steps & Portland Plumber Response

A gas leak is one of the few household emergencies where the right first move is not to grab a tool, but to walk out the door. Natural gas is invisible, it spreads fast, and the same fuel that quietly heats your Portland home can ignite from something as small as a light switch sparking or a refrigerator compressor kicking on. If you smell rotten eggs right now, stop reading, get everyone outside, and make your calls from the sidewalk — the rest of this page will still be here.

For everyone who is safe and simply wants to understand the risk, this guide walks through how to recognize a leak, why it is so dangerous, the exact evacuate-first steps Portland Fire and NW Natural want you to take, where the utility's responsibility ends and yours begins, and what a licensed plumber actually does to find and fix a leak on the house side of the meter. The goal is for you to know precisely what to do before, during, and after — without guessing.

How to Recognize a Gas Leak

Natural gas has no natural odor, so NW Natural adds a chemical called mercaptan that gives leaking gas its unmistakable rotten-egg or sulfur smell. That smell is the single most reliable warning sign you will ever get, and you should treat it as real every time, even if it fades. Our noses tire of the odor quickly, a phenomenon called olfactory fatigue, which is exactly why "it stopped smelling" is never proof the leak stopped.

Beyond the smell, your other senses can tip you off. Listen for a faint hissing or whistling near a gas appliance, a flexible connector, or a buried line. Look for dead or discolored vegetation in an otherwise healthy yard — a patch of dying grass or shrubs directly over a buried gas line can mean gas is escaping underground and displacing oxygen at the roots. If a line runs near standing water or a puddle, escaping gas can even show up as small bubbles rising to the surface.

Watch your body, too — gas displaces oxygen, and the early physical symptoms are easy to mistake for the flu or a stuffy house. Be alert to:

• Headaches, dizziness, or lightheadedness that ease when you step outside
• Nausea, fatigue, or an unusual drowsiness shared by more than one person in the home
• Irritated eyes or throat, or difficulty breathing
• Pets acting lethargic or sick for no clear reason

Why a Gas Leak Is So Dangerous

A gas leak threatens your home in three distinct ways, and understanding each one explains why the safety steps are so strict. The first and most dramatic is fire and explosion. Natural gas is highly flammable, and once enough of it accumulates in an enclosed space, any ignition source — a spark, a pilot light, a static shock — can trigger a flash fire or a structural explosion. This is the reason you never operate anything electrical when you suspect a leak.

The second danger is carbon monoxide. When natural gas burns incompletely — in a poorly vented furnace, water heater, or stove — it produces carbon monoxide, an odorless, colorless gas that binds to your blood and starves your organs of oxygen. Mercaptan will not warn you about carbon monoxide, which is why a working CO detector on every level of your home is essential alongside your nose. The third danger is simple asphyxiation: in a confined space, escaping gas pushes breathable air out, and that is what drives the headaches, dizziness, and drowsiness described above.

Evacuate First: The Protocol That Saves Lives

The instinct to investigate, sniff around, or "just check the stove" is the most dangerous thing you can do. The protocol is the opposite: get out first, then call from a safe distance. Every step below is designed to avoid creating an ignition source or breathing more gas.

• Leave immediately — take every person and pet with you and get outside to fresh air.
• Touch no switches or flames — do not flip lights on or off, unplug anything, light a match, or start a vehicle in an attached garage. A switch arcs internally even when it feels routine.
• Use no phones indoors — leave your cell phone where it is rather than dialing inside; make calls only once you are outside and away from the building.
• Leave the door open behind you so gas can ventilate, and do not close up the house.
• Call from outside — once you are a safe distance away, call the NW Natural emergency line at 800-882-3377 and call 911. Both, every time.

Do not go back inside for valuables, and do not return until NW Natural or the fire department tells you it is safe. NW Natural will respond around the clock to locate the source and make the area safe at no charge to you — that part of the response is theirs.

How to Shut Off Gas at the Meter

You do not have to touch the meter for the protocol to work — evacuating and calling is what matters most. But if you can reach the meter safely on your way out, without going back into a gas-filled space, shutting it off can help. Find the shutoff valve on the pipe coming out of the ground into the meter. It is a rectangular nub, and when the long side of the valve runs parallel to the pipe, the gas is on.

To shut it off — use a wrench (or a dedicated meter-shutoff tool) to turn the valve a quarter-turn so it sits perpendicular to the pipe, crossing it. That single quarter-turn stops the flow to the entire house. Keep a wrench near the meter, or know where one is, so you are not hunting for tools in an emergency.

One firm rule: once you turn the gas off, leave it off. Never turn your gas back on yourself. Restoring gas safely means relighting every pilot and verifying every appliance, and only NW Natural or a qualified professional should do it. Turning it back on prematurely can flood the house with unburned gas all over again.

Where the Utility Stops and Your Responsibility Begins

This is the part most homeowners get wrong, and it determines who you call once the emergency is handled. NW Natural owns and maintains the service line running from the street up to and including your meter. If the leak is on their side — the buried service line or the meter itself — they repair it and they make it safe, and that response does not come out of your pocket.

Everything on the house side of the meter is yours. That includes the supply piping running through walls and crawlspaces, the appliance flex connectors behind your stove and dryer, the corrugated tubing feeding your furnace, and any buried line you ran out to a detached garage, shop, fire pit, or pool heater. When the leak is on that side of the meter, NW Natural will shut the gas off to keep you safe, but the repair is yours to arrange — and that is the work a licensed plumber handles. If you are facing exactly that situation, our emergency gas line repair team works the house-side piping that the utility will not touch.

What a Licensed Portland Plumber Actually Does

Finding a gas leak is precise work, not a sniff-and-guess. A licensed plumber starts by locating the source with an electronic combustible-gas detector — an "sniffer" that reads gas concentrations far below what your nose can sense — and confirms the exact spot with a soap-bubble test on fittings and joints, where escaping gas blows visible bubbles. Pinpointing the leak this way means the repair is targeted instead of a tear-out of good pipe.

From there, the repair depends on what your home is plumbed with. We re-thread or replace sections of threaded black iron pipe, the traditional workhorse of residential gas systems. We repair and properly terminate CSST — corrugated stainless steel tubing — which is flexible and common in newer homes but carries a critical code requirement: it must be electrically bonded so a nearby lightning strike cannot arc through and puncture the thin tubing. For lines running out to a garage or shop, we repair the polyethylene yard lines buried in your soil.

The work is not finished until it is proven gas-tight — after any repair, a plumber pressure-tests the system with air or inert gas and watches a gauge to confirm there is zero pressure loss before gas is restored. We also pull the required permit so the repair is inspected and on record. We provide an upfront written estimate before the work begins. As a point of reference, isolated gas-line repairs in the Portland market generally run in the $150–$500 range, though the real figure depends on access, the type of pipe, and how much line is involved.

Permits, Code, and Preventing the Next Leak

In Oregon, gas work is permitted work — there is no minor-repair exemption that lets a homeowner or handyman quietly swap a gas line. Permits are pulled through Portland Permitting & Development via the state's Oregon ePermitting system, and the finished work must pass a pressure test and inspection under the 2023 Oregon Plumbing and Mechanical Specialty Code. That paper trail is not bureaucracy for its own sake; it is the record that protects you, your insurer, and the next owner by proving the gas system was repaired correctly and tested tight.

Prevention is mostly about not waiting for the rotten-egg smell. Have your gas appliances and connectors inspected periodically, especially the flex connectors behind a stove or dryer, which can corrode or crack with age and movement. If your home is older, your gas lines have never been professionally checked, you are buying or selling, or you have just done a remodel that disturbed the piping, that is the moment to schedule an inspection rather than gamble.

If you ever smell gas, the order never changes: get out, call NW Natural at 800-882-3377 and 911 from outside, and let the professionals make it safe. Once the immediate danger is cleared and the leak is on your side of the meter, call a licensed and insured Portland plumber to find it, repair it, pressure-test the system, and permit the work. For inner-Portland addresses we typically reach you in 30–60 minutes, ready to make your home safe to live in again.