How to Shut Off Your Water: Learn It Before You Need It

• Fixture stops. The small oval or lever valves under sinks and behind toilets; each isolates one fixture. A dripping faucet or running toilet needs only its own stop, and the rest of the house never notices.
• Appliance valves. Washer boxes have hot and cold pairs (levers on modern boxes); dishwashers tie to a stop under the kitchen sink; fridges to a small valve behind or below. Know the washer's especially, because burst washer hoses are the classic flood.
• The water heater's cold inlet. The valve on the cold pipe entering the heater stops the tank from refilling, which is the move for heater leaks. Gas or power off as well on a failing heater; the emergency page carries that sequence.
• The house main. The valve that stops everything, typically where the service line enters: basement front wall, garage, crawl space entry, or near the pressure regulator in warm climates. This is THE valve to find today: burst pipes, slab leaks and every unlocated disaster end here.
• The meter or curb stop. At the meter box near the street. Usually the utility's territory, often needing a meter key, and the fallback when the house main fails or does not exist. Know where it is; use it as plan B where your utility allows it.

• Find and label the main. Locate it, tag it (bright tag or paint dot), and tell every adult in the house. In an emergency at 3 a.m., the label is for your houseguest, your teenager and future-you.
• Turn it once. Gate valves (round wheels) turn clockwise to close, sometimes many turns; ball valves (levers) close in a quarter turn. A valve that will not budge, weeps when moved, or spins uselessly has just told you something vital while the house is dry.
• Exercise the fixture stops. Close and reopen each stop under sinks and toilets. Expect a few stiff ones in any older house; better to discover them now. Seized or weeping stops are cheap replacements on the maintenance page's list.
• Test the result. With the main closed, open a faucet: flow should die to a trickle and stop. That confirmation is the whole point. A main that does not fully close is a repair to schedule, not a surprise to have later.

Old gate valves seize, weep at the stem when finally moved, or close without fully sealing. All of that is common, all repairable, and all infinitely better found on a calm Saturday. A failing main shutoff is the one to fix promptly: it is the single most important valve in the house, and modern quarter-turn ball valves replace old gates as a routine service. The shutoff valve pages cover repair versus replacement.

Renters and condo owners: find your unit's valve AND learn the building's protocol, meaning who has access to risers and building mains, and the emergency number that reaches them. In multifamily buildings, knowing the phone number is knowing the valve.

• Main Water Shutoff Valve
• Shutoff Valve Repair
• Shutoff Valve Replacement
• Burst Pipe Emergency

• Frozen Pipes: Prevent Them Right, Thaw Them Safely
• How to Read Your Water Meter (and Catch Leaks With It)