Three Ways a House
Can Turn On You.

⚡ Three Ways a House Can Turn On You

A house is fed by three things, and every one of them is perfectly obedient right up until it is not.

Water will run for a fortnight into a room nobody is standing in. Gas will fill a kitchen quietly and wait for somebody to reach for a light switch. Electricity will sit in eight inches of floodwater looking exactly like water.

Each of the three has a place where you can shut it off. That is not the difficult part. The difficult part is that most people do not know where theirs are, and find out on the worst day of their lives, in the dark, in a hurry.

This page is a Saturday afternoon’s work when nothing at all is wrong. Go and find three things, write down what you learn, and put the page away. That is the entire job.

💧 The Water: Two Valves, and One of Them May Not Be Yours

Almost every house has two places the water can be stopped.

There is one out at the meter, usually in a box in the ground near the street with a lid you cannot lift by hand. And there is one where the line comes into the house — on a basement or crawlspace wall in most of the country, in a garage or a utility closet where there is no basement, and on the outside wall near a hose bib in a good many warm-climate houses built on a slab.

The one in the house is the one you use. It is nearer, it is dry, and nobody has to give you permission.

The one at the meter is more complicated, and this is the part worth knowing before you need it. The valve on the street side of the meter generally belongs to the utility, not to you. Some places will tell you plainly that no one but their own crew may open that box — homeowners and plumbers alike. Others will tell you the opposite, that the box and the valve are the property owner’s to maintain and keep clear. There is no national answer.

To get the lid up and the valve turned you want a meter key — a long steel bar, usually a couple of feet of it, with a handle across the top and a forked or notched end that straddles the valve tang. They are cheap. Keep it where you will find it in the dark, which is not the back of the garage.

And go out once, on a dry day, and turn it. A valve that has not moved in twenty years is a valve nobody knows the condition of, and the day you find out should not be the day it matters. If it will not move under reasonable pressure, stop. That bar gives you a great deal of leverage and the operating nut is the part that snaps, and in some districts you will be paying for what you break.

If you go looking inside the house and there simply is not one — and on older slab-built houses there often is not — then that is the thing to have fitted. It is about an hour of a plumber’s time. Have it done on a visit you were already paying a call-out for and it costs you almost nothing extra, which is an argument this site makes about nearly everything.

🔥 The Gas: A Quarter Turn, and One Rule You Do Not Break

Gas is laid out the same way water is. There is a valve on the utility’s side, out at the meter where the pipe comes up from the ground, and there is usually a house-side valve where the line goes in. Older houses sometimes have only the one.

The valve is not a handle you grip. It is a flat rectangular tang on top of a fitting, and it takes a wrench.

That is the whole mechanism. A quarter turn in either direction until the tang sits crosswise to the pipe and the gas is off. Nothing to remember, nothing to unscrew.

Keep a twelve-inch adjustable wrench where you can get it — with the storm supplies, or in a bag by the door. Not hung on the meter and not resting on the gas piping, which the gas companies ask specifically and for reasons that ought to be obvious once you think about a length of steel lying against a joint for ten years.

And if you can smell gas indoors, the order is not up for debate: everybody goes outside first, and the phone call is made from outside. Not from the kitchen. No light switches on the way out, no garage door opener, nothing that makes a spark. You are not saving the house at that point. You are getting people out of it.

One more thing that gets missed. Nearly every gas appliance has its own little shutoff behind or beneath it, and if the trouble is one appliance, that valve is the right one to close rather than killing the whole house and buying yourself a utility visit to get it all lit again.

👃 The Nose You Cannot Entirely Trust

Natural gas has no smell. What you are smelling is mercaptan, put in on purpose so that a leak announces itself, and for most people most of the time it works.

Here is the trouble with resting a house on it.

In one study, forty-five percent of elderly subjects could not detect the warning odour in natural gas at the level the safety standard is built around. Not a few of them. Nearly half. And that is before you get to the ordinary things — a head cold, a lifetime of smoking, a medication that flattens the sense out, a nose that has already been in the room long enough to stop registering the smell at all.

The gas companies say this themselves. They will tell you that soil can strip the odorant out of a leak that is underground, that the smell may not wake a sleeping person, and that a few minutes of exposure causes the nose to give up on it. Which is why the utilities recommend a listed combustible gas detector rather than trusting the only sensor you were born with.

What you want is a combustible gas alarm, or a combination unit that does both jobs. And then the one detail that decides whether it works at all:

Natural gas rises. Propane sinks. Methane is lighter than air, so a natural gas alarm goes up high, near the ceiling. Propane is heavier than air and pools on the floor, so an LP alarm goes low — six to twelve inches off the ground is the usual instruction. Put a propane alarm up by the ceiling and you have hung an ornament. That matters in a great deal of the country: propane heats and cooks in rural houses in every state, and in cabins, and in every camper ever built.

Check what the label says and where the maker tells you to put it. Gas detectors get replaced about every five to seven years and CO alarms about every five to ten, and both of them print the date on the back.

🔌 The Panel: Label It While Everything Is Fine

The electric panel is the one people are most frightened of and it is the one that asks the least of you. You are not opening anything. You are looking at a grey door, and behind it a column of switches with one bigger switch at the top.

That big one is the main. It cuts everything.

Three things worth doing on the same afternoon you find it. Make sure you can get at it — a panel behind a bookcase or a stack of boxes in a closet is a panel you cannot reach at speed. Label the breakers, which takes two people and half an hour and is the single most useful thing anybody has ever done in a basement. And put a torch beside it, because the reason you are standing there is very often that the lights are out.

The main breaker is what you reach for when there is water where water should not be, when there is a smell of burning, or when a repair needs a circuit dead and you would rather be certain than trusting a label somebody wrote in 1994.

🌊 Going Back Into a House That Has Flooded

This is the one where doing the obvious thing in the wrong order is what kills people, and it is worth its own section.

The instinct is right: get the electricity off before you do anything else. Floodwater and a live house are a genuinely lethal combination, and water standing against outlets, cords and appliances should be treated as energized, because it may be.

But there is a condition on it that matters more than the instruction does.

The rest of it follows the same shape. Do not go into a flooded basement or a flooded room at all unless you are certain the power is dead. If the outside service equipment went underwater, the utility should pull their metering gear before anybody goes in, because restoring power to a drowned meter is how you get a fire instead of a flood.

And it does not go back on because the water went away. A house that has been flooded wants an electrician to look at the system before it is energized, and anything that was actually submerged — breakers, fuses, the GFCI and arc-fault devices, surge protectors — gets thrown away rather than dried out and trusted. Most wet appliances are finished too, whatever they look like.

Gas gets the same treatment on the way back in. If there is any smell of it, nobody turns on a light, everybody goes out, and the call is made from the yard.

None of that is a repair. It is an order of operations, and it is worth reading now rather than working out on a doorstep with the water still going down.

🛑 What Is Not on This List

Finding these things is yours. Most of what follows from finding them is not.

Any valve that will not turn. Discovering it is stuck is the useful part. Freeing it, replacing it, or cutting into the pipe to do so is a trade.

Turning gas back on, in any circumstance whatsoever. This has no exceptions and no degrees.

Anything inside the electric panel. The door stays shut. Labelling is done from the front with the switches, not with a screwdriver.

Re-energizing a house that has been under water. An electrician looks at it first.

Fitting a house-side main where there is not one. Worth having, worth paying for, not worth doing yourself.

⚖️ Why This One Belongs on the List

Nothing on this page is a repair. Nothing on it costs anything much. A meter key, an adjustable wrench, a gas alarm, a roll of labels and one phone call.

What it buys is the ten minutes at the start, and the ten minutes at the start is the entire difference between a wet carpet and a wrecked house, or between a gas leak and a funeral.

People do not fail at this because it is hard. They fail at it because there is never a reason to do it today. It is the same shape as every other thing on this site: cheap and easy and optional, right up until it is none of those.

Go and find the three of them this weekend. Write down where they are and stick it inside a kitchen cupboard door where somebody else in the house will find it too, because you may very well not be the one standing there.

Elsewhere on this site, if it is useful: