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LEAK GUIDE · SANTA ANA & CENTRAL ORANGE COUNTY

How to Shut Off the Water to Your House

If water is coming in right now, go to the main shut-off and turn it clockwise until it stops. It is usually where the supply enters the house, or in the meter box at the street. Everything else on this page is worth reading on a calm afternoon, but that sentence is the emergency.

How to Shut Off the Water to Your House

Where the Main Shut-Off Usually Is

Most houses have two: one on the house, and one at the meter. Either stops the water; they are just in different places and one is easier to reach than the other.

LocationWhat to look for
Garage wall, where the supply entersA valve on the pipe, often near the front corner
Exterior wall of the houseA valve in a small recess, sometimes behind a cover plate
A utility closet or laundry areaSame, on the incoming line
Under a sink at the front of the houseLess common, but it happens on older builds
The meter box at the streetA valve beside the meter, on the house side
Worth knowing Find yours now, before you need it. Open the box, look at the valve, and check it actually turns. A valve that has not moved in twenty years and will not budge in an emergency is a common and entirely avoidable problem.

The Two Types of Valve, and How Each Turns

Ball valve
A lever handle. A quarter turn is the whole travel: handle in line with the pipe is open, handle across the pipe is closed. Fast, obvious, and very hard to get wrong. This is what you want to have.
Gate valve
A round wheel handle. Turn it clockwise, and keep turning. It can take many full rotations to close. Older, common in mid-century houses, and the type that seizes.
A gate valve that will not turn
Do not force it. Snapping the stem inside the body leaves you unable to close it at all. Go to the meter valve instead, and get the house valve replaced before you need it again.

If your house still has a gate valve on the main, replacing it with a ball valve is a small job with a large payoff. It is the difference between a five-second shut-off and a struggle at midnight.

Shutting Off at the Meter

1
Open the meter box
Concrete or plastic lid near the street, often marked WATER. A screwdriver in the notch lifts it. Look before you reach in, insects and spiders like meter boxes.
2
Identify the house-side valve
Beside the meter, on the side toward your property. There may be a second valve on the street side; that one belongs to the City and is not yours to operate.
3
Turn it clockwise
Some are a lever, some need a meter key or a wrench. If yours needs a tool, buy the tool now and keep it with the lid.
4
Confirm
Open a tap inside. It should run briefly as the lines drain and then stop.

If the valve is seized, or the only valve you can find is on the street side, call the City of Santa Ana rather than forcing it — (714) 647-3380.

Fixture Valves — Shutting Off Less Than the House

Most leaks do not need the whole house shut down. Every fixture should have its own stop, and using it keeps the rest of the house working.

FixtureWhere its valve is
ToiletOn the wall behind or beside it, on the supply line
SinkUnder it, usually two, hot and cold
Washing machineBehind it, at the wall box, two taps
DishwasherOften under the adjacent sink
Water heaterOn the cold inlet at the top of the tank
Refrigerator ice makerBehind the fridge, or on the line in a cabinet
Hose bibIts own handle, and sometimes an interior shut-off too

Fixture stops seize up exactly like main valves do. Turning each one closed and open again once a year keeps them working, and takes about ten minutes for a whole house.

After the Water Is Off

1
Open a low tap
A ground-floor or outdoor tap. That drains the water still in the lines downward, away from wherever the leak is, instead of leaving it to find the hole.
2
Cut power to any wet area
At the breaker, not at the switch, and never while standing in water. If you cannot reach the panel safely, leave it.
3
Turn the water heater off
If the supply is going to be off for a while. Gas to pilot, or the breaker for an electric unit, heating an empty tank damages it.
4
Photograph everything
Before you clean up. It is the only moment that evidence exists. See documenting a leak.
5
Then move water and start drying
In that order. Documentation first, cleanup second.

When Not to Turn It Back On

The instinct to test whether it is still leaking is strong and it is usually the wrong instinct.

  • Do not turn it back on to “see if it is still going”. It will be, and now there is more water in the building
  • Do not leave it on overnight because somebody wants a shower. Isolate the leaking line instead if you can
  • Do turn it back on if the leak is clearly at one fixture and you have closed that fixture’s own stop
  • If you are not sure which line is leaking, leave it off and say so when you call

A house with the water off for a night is an inconvenience. A house with the water on and a leak running into a ceiling for a night is a restoration job.

Gas Is a Different Emergency

Worth being explicit, because people conflate the two and the response is completely different.

Leave the building first
Do not look for the source, do not open windows on your way past, just get everybody out.
Do not touch anything electrical
No light switches, no garage door, no phone until you are outside and away.
Call SoCalGas from outside
1-800-427-2200, answered 24 hours. They come out to gas leaks.
Do not shut the gas off yourself unless it is safe to
The meter valve needs a wrench and it is not worth going back for. Getting out is the priority.

The full version is on what to do if you smell gas.

What This Site Is About, and What Belongs to Another Trade

We are licensed and insured plumbers, and this site is about leaks, finding the ones you cannot see and repairing them properly. Roughly half of what looks like a plumbing leak turns out not to be one, so the boundary is worth stating plainly.

Roof leaks are a roofer. Water under an air handler is an HVAC technician clearing a condensate drain. Water under an appliance is appliance repair. Drying, restoration and mold are separate trades again, and gas line repair is SoCalGas or a licensed gas fitter. We detect gas leaks, we do not repair gas lines.

The full list, with the trade to call for each, is on what we don’t do.

Things Worth Doing This Weekend

  • Find the main shut-off and confirm it turns. Both of them, house and meter
  • If it is a gate valve that is stiff, plan to have it replaced with a ball valve
  • Buy a meter key if yours needs one, and keep it with the lid or by the front door
  • Show everyone in the house where the valve is, the person home at the time may not be you
  • Photograph the valve and the meter box location and put it somewhere findable
  • Exercise the fixture stops under sinks and behind toilets so they still work

Twenty minutes, once. It is the highest-return maintenance task in a house and almost nobody does it until after the first flood.

If It Is Already Bad

Detection visit
$150 – $500
Flat, credited toward the repair
Spot repair
$1,500 – $3,500
Accessible, or under finished floor
Reroute
$2,000 – $4,500
Per line
Whole-house repipe
$6,000 – $15,000
PEX or copper

Calls are answered 24/7 and a technician is dispatched 24/7, in English and Spanish. After-hours pricing is given on the call, before anyone is dispatched. Shut the water off first. That does more than anything we can do on the phone.

Water still coming in? Shut the main off, then call. Answered 24/7.
Call (714) 386-7923
David Herrera, Founder & Lead Leak Detection Technician
About the Author
David Herrera, Founder & Lead Leak Detection Technician
David founded Leak Detection Santa Ana in 2026 after more than 15 years finding and repairing leaks across Orange County. He leads the crew that does the work, and the judgement calls on this page are the ones he uses in the field. Meet the team.

Call Now — Answered 24/7

Shut the water off at the main first. Then call and we will take it from there.

(714) 386-7923Call or text, day or nightSchedule a Visit

What’s Included

  • Acoustic, thermal & tracer-gas location
  • Plain-language explanation of what we found
  • Firm written quote, on-site
  • No-find-no-fee guarantee

Frequently Asked Questions

Clockwise to close. On a lever-handled ball valve it is a quarter turn — handle across the pipe means closed. On a round-wheel gate valve it can take many full turns before it seats.

Usually where the supply enters the house: a garage wall, an exterior wall, or a utility area. There is also one in the meter box at the street on the house side of the meter. Either will stop the water.

Do not force it — snapping the stem inside an old gate valve leaves you unable to close it at all. Use the valve at the meter instead, and have the house valve replaced with a ball valve before you need it again.

Sometimes. Some meter valves have a lever; others need a meter key or a wrench. Find out which yours is now and buy the tool if you need one — discovering it at midnight is the wrong time.

If the water is going to be off for more than a short while, yes. Gas to pilot, or the breaker for an electric unit. Heating an empty or partly empty tank damages it.

Often, and it is the better answer when you know which fixture is leaking. Toilets, sinks, washing machines and water heaters all have their own stops, and using one keeps the rest of the house working.

Please do not. It will be, and testing it just puts more water into the building. If you need water, isolate the leaking line rather than repressurising the whole house.

That is the City’s side. Report it to the City of Santa Ana on (714) 647-3380 rather than paying a plumber: the main, the service line to the meter and the meter itself are all theirs.

No, and gas is a different emergency entirely. Leave the building, touch nothing electrical, and call SoCalGas on 1-800-427-2200 from outside. They are answered 24 hours and they come out to gas leaks.

Once a year is plenty, and it takes minutes. Turning each valve fully closed and open again is what stops them seizing, and it is far better to discover a stuck valve on a Sunday afternoon than during an actual leak.