A pipe bursts under the kitchen sink. The washing machine hose blows. Your toilet starts overflowing and will not stop. In any of these situations, the first thing you need to do is shut off the water and if you have to spend three minutes Googling where the valve is, that is three minutes of active flooding inside your home.

This is a five-minute read that could save you thousands.

Here is exactly where to find your shut-off valves and how to use them.

Start With the Fixture Shut-Off (Fastest Option in Most Emergencies)

Every toilet, sink, dishwasher, and washing machine in your home should have its own individual shut-off valve. For toilets, look for an oval-shaped valve on the wall or floor behind the base of the toilet it is usually chrome or plastic. Turn it clockwise until it stops. The toilet is now isolated and nothing else in your house is affected.

Under every sink you will find a similar valve on the cold and hot supply lines coming out of the wall or cabinet floor. Turn both clockwise to shut off water to that fixture only. These valves are your first stop in a single-fixture emergency there is no need to cut water to the whole house if the problem is contained to one area.

How to Shut Off the Water Heater Supply

If your water heater is leaking or you need to do any work on the hot water system, find the cold water supply line going into the top of the unit. There will be a valve on that line turn it clockwise. Also shut off the gas or power to the unit before the tank empties, since running a water heater dry damages the heating element.

Finding Your Main Shut-Off Valve in San Diego

If the problem is serious a burst pipe, a slab leak, or anything you cannot isolate to one fixture you need the main shut-off valve. This cuts all water into the house at once.

In most San Diego homes, the main shut-off is located in one of three places: inside a utility closet or garage near where the main water line enters the house, on an exterior wall near the front of the home, or in a ground-level box near the street (sometimes called the meter box or curb stop). Look for a round wheel-style valve or a lever handle. Turn a wheel valve clockwise to close, or rotate a lever 90 degrees so it runs perpendicular to the pipe.

If your main shut-off valve is corroded, stuck, or nowhere to be found, that is a problem to fix before an emergency, not during one. PlumbTech installs and services shut-off valves and full repipe systems across San Diego call us for a quick inspection if you are not sure your valves are operational.

Do not wait until water is pouring across your floor to find out where your shut-off is.

Walk your home today and locate every valve. If anything looks corroded, stripped, or stuck, call PlumbTech at 1-800-388-8149 before it becomes an emergency.

The Meter Shut-Off: Your Last Resort

If you cannot locate or operate the main valve inside your property, the water meter at the street has its own shut-off. In San Diego, these are typically in a rectangular concrete box flush with the sidewalk or curb, marked “Water.” You will need a meter key or a flathead screwdriver to open the lid and turn the valve.

Per the City of San Diego, if you believe the leak is on the city’s side of the meter, call their Water Emergency Hotline at 619-515-3525. If the leak is on your side, it is your responsibility to repair and a licensed plumber is your fastest call.

After You Shut the Water Off

Once the water is off, document everything. Take photos, check for visible moisture on walls and floors, and note where you first noticed the problem. Then call a licensed plumber. If you suspect a hidden leak especially one below the slab do not turn the water back on until the source has been found. The waste line camera inspection and slab leak detection services from PlumbTech can locate the problem precisely before any repair work begins.

Pipe emergency in San Diego?

Call PlumbTech right now at 1-800-388-8149 or email Plumbtech.pros@gmail.com.

Our licensed plumbers are ready to respond across San Diego. Book a service visit online here.

Frequently Asked Questions

Where is the main water shut-off valve in a San Diego home?

• Most commonly in the garage, a utility closet, or on an exterior wall near where the main line enters the house. In older San Diego homes, it may be in a ground-level box near the front of the property. If you are not sure, a plumber can locate and label it for you in under 30 minutes.

What if my shut-off valve will not turn?

• Do not force it you can break the valve stem and make the situation worse. Use the meter shut-off at the street as a temporary measure, then call a licensed plumber to replace the corroded valve.

Should I shut off the water heater when I cut the main supply?

• Yes. If you shut off the main water supply, turn the water heater to its lowest setting or fully off. Continuing to run a water heater when the tank cannot refill can damage the heating element or tank lining.