How to Locate and Use Fixture Shutoff Valves
You do not always need to shut off the water to your entire house. Most plumbing repairs only require isolating a single fixture. Knowing where each fixture's shutoff valve is located lets you work on one toilet or faucet while the rest of your house has running water.
Time Required
15 - 20 minutes (full walkthrough)
Difficulty
Easy
Help Needed
None — fully DIY
Toilet Shutoff Valves
Toilet shutoffs are the ones you will use most often. Running toilets, leaking fill valves, and wax ring replacements all require you to close this valve first.
Find the valve behind and below the toilet tank
Look on the wall or floor near the base of the toilet, typically on the left side when facing the toilet. You will see a small chrome or brass valve connected to a flexible braided supply line that runs up to the bottom of the tank.
Turn the valve clockwise to close
Older toilets have multi-turn oval-handled valves. Newer installations often have quarter-turn ball valves. Turn until the handle stops. Do not over-tighten — you only need to stop water flow, not strip the valve.
Flush the toilet to empty the tank
After closing the valve, flush once. The tank should not refill. If water continues to trickle in, the valve is not sealing completely — you may need to close the main shutoff instead.
Sink Shutoff Valves (Kitchen and Bathroom)
Every sink should have two shutoff valves — one for hot water and one for cold. These are essential for faucet replacements, fixing leaks under the sink, and garbage disposal work.
Where to Find Them
- Open the cabinet below the sink: The valves are mounted on the wall at the back of the cabinet, connected to the pipes coming out of the wall or floor.
- Hot is on the left, cold is on the right: This is the standard convention in North American plumbing. Hot water valves are on the left side when facing the sink.
- Supply lines run upward to the faucet: Each valve connects via a flexible braided line or rigid chrome tube to the faucet connections above.
- Kitchen sinks may have a third line: If you have a dishwasher, a third valve or tee fitting branches off the hot water supply to feed the dishwasher.
Dishwasher Shutoff Valve
Dishwashers use hot water only, so there is just one supply valve to find. Its location varies depending on your home's plumbing layout.
Most common location: under the kitchen sink
Look under the kitchen sink for a tee fitting or a separate valve on the hot water line. The dishwasher supply line typically runs from this point through the cabinet wall or floor to the dishwasher. Closing this valve shuts off water to the dishwasher only.
Alternative location: in the basement
In some homes, the dishwasher supply valve is in the basement or crawl space directly below the dishwasher. Look for a single valve on a branch line near the kitchen drain stack. This is more common in older homes where the dishwasher was added after the original plumbing was installed.
Washing Machine Shutoff Valves
Washing machine supply hoses are under constant pressure, making burst hoses one of the top causes of residential water damage. Knowing these valves is critical.
Look behind the washing machine
You will find two valves mounted on the wall — one for hot (red handle or left side) and one for cold (blue handle or right side). They connect to the washing machine via rubber or braided steel hoses.
Check for a recessed valve box
Many newer homes have a recessed plastic or metal box in the wall behind the washer. This box contains both valves and sometimes a drain connection, making it easier to access without pulling out the machine.
Consider a single-lever shutoff
Single-lever washing machine valves shut off both hot and cold with one handle. These are a worthwhile upgrade ($30 to $60 installed) because they make it easy to turn off both lines quickly before vacations.
Important: Turn off valves before vacation
Insurance adjusters see more claims from burst washing machine hoses than almost any other plumbing failure. Close both valves whenever you leave home for more than a day. A burst hose at full pressure can dump 500 gallons of water per hour into your home. If you forget to check before leaving, turn off the main shutoff valve instead.
Water Heater Shutoff Valve
The water heater has its own dedicated shutoff valve on the cold water inlet. You will use this when draining, servicing, or replacing the water heater — and it is covered in detail in the next step.
Quick Identification
- Location: On top of or just above the water heater, on the cold water inlet pipe (typically the pipe on the right side when facing the unit).
- How to identify cold vs hot pipes: The cold water inlet pipe often has a blue ring or label. You can also feel the pipes — the hot outlet pipe will be warm to the touch when the heater is running.
- Valve type: Most water heater shutoffs are ball valves with a lever handle. Turn the lever perpendicular to the pipe to close.
Pro Tips
- •Upgrade rubber washing machine hoses to braided steel: Rubber hoses degrade over time and are the most common failure point. Braided stainless steel hoses cost $15 to $25 per pair and last much longer. Replace rubber hoses every 3 to 5 years regardless of condition.
- •Label every shutoff valve in your home: Use a permanent marker on a piece of tape or a small hang tag. Label each valve with what it controls (e.g., "Upstairs bathroom toilet" or "Kitchen sink hot"). This saves critical time during an emergency.
- •Exercise fixture valves once a year: Turn each valve off and back on during your annual maintenance check. Fixture valves are even more prone to seizing than main shutoffs because they are smaller and used less frequently.
Frequently Asked Questions
Do all fixtures have their own shutoff valves?
Most fixtures installed since the 1970s have individual shutoff valves. However, older homes may lack them on some fixtures. If a fixture does not have its own shutoff valve, you will need to use the main water shutoff to isolate it. Adding individual shutoff valves is a common and relatively inexpensive plumbing upgrade, typically costing $75 to $200 per fixture.
Which direction do I turn a fixture shutoff valve to close it?
Almost all fixture shutoff valves close by turning clockwise (right). The common memory aid is "righty-tighty, lefty-loosey." For quarter-turn ball valves, turn the handle so it is perpendicular to the supply line to close it. Always turn slowly and check for leaks at the valve after closing.
Should I turn off washing machine valves when not in use?
Yes. Most plumbers and appliance manufacturers recommend turning off washing machine supply valves when the machine is not in use. Washing machine hoses are under constant pressure when the valves are open, and a burst hose is one of the most common causes of home water damage. At minimum, turn the valves off when you leave home for vacation.