A burst supply line, a split toilet hose or a leak behind a wall can put gallons of water on your floor in minutes. Knowing how to shut off water to house plumbing before that happens is the single most useful plumbing skill a homeowner can have. Once you know where the valve is, it takes less than a minute.
This guide on how to shut off water to house plumbing covers where the main shut-off valve usually sits in Los Angeles and Orange County homes, how to close gate and ball valves, how to use the meter valve, how to isolate one fixture and what to do when a valve is stuck. If you would rather have a licensed plumber handle it, The 5 Star Plumbing (CA License #1041772) is available 24/7 across Los Angeles, Orange County and the surrounding communities.
What This Guide Covers
- Why every household should practice this now
- Where to find your main water shut-off valve
- How to shut off water to house plumbing, step by step
- Shutting off water to one fixture
- Turning the water back on safely
- When the valve is stuck, leaking or missing
- Using the meter to check for a hidden leak
- Frequently asked questions
Why every household should learn how to shut off water to house plumbing now
Most people look up how to shut off water to house plumbing for the first time while water is spraying. That is the worst moment to discover the valve is buried under ivy, painted over or rusted open.
In Southern California there is a second reason: earthquakes. The CDC’s earthquake preparedness guidance tells households to know where and how to shut off utilities, including water, to teach every family member how and when to do it, and to attach a valve wrench and a label to the water line.
Practicing how to shut off water to house valves also tells you whether they still work, because valves left untouched for years can seize. Our FAQ on how often to exercise your main water shut-off valve covers keeping it in working order.
Where to find your main water shut-off valve
The first step in how to shut off water to house plumbing is finding the valve. Most homes have two: a house-side valve where the supply pipe enters the building, and a customer valve in the meter box near the street. Learn both.
The house-side valve
Many Los Angeles and Orange County homes are built on slabs or raised foundations without basements, so the house-side valve is often outdoors. Walk the outside walls and look for a pipe coming up out of the ground and into the house, usually on the side facing the street. In a slab home it can also be near the water heater.
The customer valve in the meter box
East Orange County Water District notes that most residential meters are near the street, typically in a meter box at the front of the property. The valve on the street side belongs to the water utility, and Angi notes that tampering with it is restricted in many places. The valve on the house side is the customer valve. Los Angeles County Public Works describes it as usually a brass handle on the house-line side, sometimes painted blue or marked with a flow arrow.
Condos, townhomes and apartments
In shared buildings, how to shut off water to house units depends on the plumbing layout. Your unit may have its own valve in a utility closet, behind an access panel or near the water heater, while the HOA or property manager controls the building main. Find out where your valve is and who to call before you need it.
How to shut off water to house plumbing, step by step
Here is how to shut off water to house plumbing in an emergency, in order.
- Go to the house-side valve first. It is usually the easiest to reach.
- Identify the valve type. A round wheel handle is usually a gate valve. A flat lever is a ball valve. See the table below.
- Close it gently. Turn a gate valve clockwise until it stops. Turn a ball valve lever a quarter turn so it sits across the pipe.
- Check that the water is off. Open a faucet or hose bib. Los Angeles County Public Works recommends this check.
- Drain the lines if a pipe has burst. Open the lowest faucets in the house to relieve pressure and empty what is left in the pipes.
- Turn off the water heater if you will be draining the system. Set a gas heater to “vacation” or “pilot” and switch off the breaker for an electric unit.
- Use the meter valve if the house valve fails. This is the backup plan for how to shut off water to house plumbing: close the customer valve in the meter box.
| Valve type | What it looks like | To shut off | Notes |
|---|---|---|---|
| Gate valve | Round wheel handle, like an old outdoor faucet | Turn clockwise until it stops (several turns) | Common in older homes; prone to seizing and to breaking if forced |
| Ball valve | Straight lever handle | Quarter turn so the lever is perpendicular to the pipe | Lever parallel to the pipe means open |
| Meter customer valve | Brass handle or tab on the house side of the meter | Quarter turn clockwise (East Orange County Water District warns the wrong direction can damage it) | May need a meter key or wrench |
Shutting off water to one fixture
Knowing how to shut off water to house fixtures one at a time lets you isolate a small problem and keep the rest of the home running. Most fixtures have their own shut-off:
- Toilets: an oval or lever handle on the wall or floor behind the toilet, called an angle stop. Turn it clockwise or a quarter turn.
- Sinks: two angle stops under the sink, one for hot and one for cold.
- Water heater: a valve on the cold-water inlet pipe at the top of the tank.
- Washing machine: two valves in the wall box behind the washer.
Old angle stops, especially multi-turn styles, often drip or crack when they are finally used. If one fails, close the main and replace it. The 5 Star Plumbing’s typical price for angle stop replacement is $150 to $300; the exact price is confirmed after the technician sees the job. See our plumbing repair and replacement services for valves, supply lines and fixtures.
Turning the water back on safely
The last part of how to shut off water to house plumbing is turning it back on. Restoring water too fast can push air and debris through the pipes or stress a fresh repair, so go slowly:
- Close the faucets you opened to drain the system, but leave one open on the highest floor or the faucet farthest from the main.
- Open the main valve a little at a time. Gate valves: counterclockwise. Ball valves: turn the lever back parallel to the pipe.
- Let the open faucet sputter until it runs smoothly, then close it.
- Turn the water heater back on only after the tank is full and water flows from a hot tap.
When the valve is stuck, leaking or missing
If you are learning how to shut off water to house plumbing and discover a valve that will not budge, do not force it. A wrench on a seized gate valve can snap the stem or crack the body, and then you have an active leak you cannot stop. Close the meter valve instead and call a plumber.
Also plan a replacement if the valve drips from the stem, lets water trickle through when closed, or is buried where you cannot reach it quickly.
What replacing a main shut-off valve costs
A common upgrade is to replace a worn gate valve with a full-port ball valve. Angi’s 2025 cost data for the job is below.
| Job | Price range | Source |
|---|---|---|
| Main water shut-off valve replacement (national average) | $375 to $600; average about $500 | Angi (2025 data) |
| Main valve replacement that requires a trench | Up to about $800 | Angi (2025 data) |
| Angle stop replacement | $150 to $300 (typical; exact price confirmed after the technician sees the job) | The 5 Star Plumbing |
If you cannot follow these steps on how to shut off water to house plumbing because the valve is missing or buried, ask a plumber to add an accessible one. Some homeowners also add an automatic shut-off valve that closes when sensors detect a leak. Read about why some California insurers now ask for automatic water shutoff valves. For a broader look at pricing, see our guide to what a plumber costs in Los Angeles.
Using the meter to check for a hidden leak
Once you know how to shut off water to house fixtures, you can use the meter to check for leaks you cannot see. Los Angeles County Public Works describes the method:
- Turn off every fixture and appliance that uses water, including the washer, dishwasher, faucets, hoses and sprinklers.
- Open the meter box and find the red sweep hand or small red triangle on the register.
- If it is not moving, no water is passing through the meter. If it is turning, water is flowing somewhere on the property, which could mean a leak.
To narrow it down, close the house-side main. If the indicator stops, the leak is inside the home. If it keeps turning, the leak may be in the line between the meter and the house or in the irrigation system. Our professional leak detection service can track down hidden leaks.
The bottom line
Learning how to shut off water to house plumbing takes ten minutes and can prevent serious water damage. Find the house-side valve and the meter valve today, test them, label them and show everyone in the home. Replace any valve that is seized, leaking or hard to reach before the day you need it.
If a valve will not close, a pipe has burst or you cannot find the main, call The 5 Star Plumbing at (888) 909-0120. We are family owned, licensed (CA #1041772), have experience since 2006 and are available 24/7 for emergency plumbing service throughout Los Angeles, Orange County and the surrounding communities. You can also contact us online.
Frequently asked questions: how to shut off water to house
Which way do I turn the main valve to shut off the water?
For a round-handle gate valve, turn it clockwise until it stops (“righty-tighty”). For a lever-style ball valve, turn the lever a quarter turn so it sits across the pipe. Parallel to the pipe means open.
Where is the main water shut-off valve in a Los Angeles or Orange County home?
In many Los Angeles and Orange County homes it is outside, where the supply pipe comes out of the ground and enters the house, often on the street-facing wall near a hose bib. Some slab homes have it near the water heater. There is also a customer valve in the meter box near the curb.
Can I turn off the water at the meter myself?
Part of how to shut off water to house plumbing is using the meter box. You can generally use the customer valve on the house side of the meter. The valve on the street side belongs to the water utility, and tampering with it is restricted in many areas. If you are unsure, call your water provider first.
How do I shut off water to just one toilet or sink?
Fixture stops are the easiest part of how to shut off water to house plumbing. Use the angle stop behind the toilet or under the sink. Turn it clockwise, or a quarter turn for a lever style, and flush or open the tap to confirm the water is off.
What if the main shut-off valve is stuck?
If you followed the steps on how to shut off water to house plumbing and the valve will not move, do not force it with a long wrench, which can break the valve. Close the customer valve at the meter and call a plumber to replace the main, usually with a quarter-turn ball valve.
How much does it cost to replace a main water shut-off valve?
Angi’s 2025 data shows a typical range of $375 to $600, averaging about $500 nationally. The price depends on where the valve is and how easy it is to reach.
Why is knowing how to shut off water to house plumbing important for earthquakes?
The CDC advises households to know where and how to shut off utilities, including water, and to teach every family member how to do it. Closing the main after a quake can stop water from escaping through cracked pipes.
Sources: CDC — Preparing for Earthquakes · Los Angeles County Public Works — Waterworks Districts FAQs · East Orange County Water District — About Your Water · Angi — How to Turn Off the Water Main Shut-Off Valve · Angi — Cost to Replace a Main Water Shut-Off Valve (2025 data)
