When you have an active leak, the first job is not to fix the pipe — it is to stop the water. Every home has shut-off valves: small ones under sinks and behind toilets for a single fixture, and a main valve that cuts water to the whole house. Close the nearest one that stops the flow, then open a low faucet to drain the pressure. Knowing where your main shut-off is before an emergency is the single best thing you can do to limit water damage in a Houston home.
What you'll need
- A water meter key or large adjustable wrench
- A flashlight
- Towels and a bucket
- Your phone (to photograph the damage for insurance)
Recommended parts & supplies
- Water leak alarm / detector — alerts you the moment water pools under a sink or heater
- Pipe repair wrap / clamp — a temporary hold on a small leak until the plumber arrives
- Quarter-turn shut-off valve — replaces an old stuck fixture valve
- Water meter key — opens the meter box and turns the street-side valve
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Step by step
- 1
Try the fixture shut-off first
If the leak is at one spot — under a sink, behind the toilet, or at the water heater — look for a small oval or football-shaped valve on the supply line right there. Turn it clockwise (righty-tighty) until it stops. A quarter-turn lever style just flips 90 degrees. This isolates the problem without cutting water to the whole house.
- 2
Find your main shut-off valve
If there is no local valve or the leak is inside a wall, go to the main. In most Houston slab homes it is where the water line enters the house — near an outdoor hose bib on the street-facing side, in the garage, or in a utility closet. It is a round wheel or a lever valve on the main pipe.
- 3
Close the main valve
Turn a round wheel valve fully clockwise, or flip a lever valve so it sits crosswise (perpendicular) to the pipe. If the wheel is stuck or corroded, do not force it hard enough to snap it — move to the street meter instead.
- 4
Use the street meter if needed
At the curb or edge of the yard is a rectangular in-ground box marked water. Lift the lid and you will see the meter and a valve. Using a water meter key or wrench, turn the valve a quarter turn until the slot is crosswise to the pipe. This cuts all water to the property — your last-resort shut-off.
- 5
Open a low faucet to relieve pressure
Once the water is off, open a faucet on the lowest level of the house (or an outdoor hose bib) and let the lines drain. This drops the pressure so the leak slows to a stop and the pipe is safe to work on or wait on.
- 6
Document the damage and call for help
Take photos and video of the leak and any water damage for your insurance before you clean up. Mop up standing water quickly — Houston humidity grows mold within a day or two — then call a licensed plumber for anything beyond a simple part swap.
When to call a pro
Shutting off the water is pure DIY, but the repair often is not. Call a licensed plumber right away for a burst or split pipe, any leak inside a wall or ceiling, a suspected slab leak (warm spots on the floor, a spiking water bill, the sound of running water with everything off), or if you cannot get the water to stop. If water reached drywall, flooring, or the electrical system, get a pro out fast — hidden moisture and mold spread quickly in our climate.
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How to Shut Off Your Water and Stop a Leak Fast — FAQ
Where is my main water shut-off valve?
Which way do I turn a water valve to shut it off?
What should I do first when a pipe bursts?
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