Should You Turn Off the Water When You Go on Vacation?
A leak that would be a mop-up in an occupied house can become a flood in an empty one. Here is how to decide and what to do.
- 24/7 emergency calls
- Nights, weekends and holidays
- Mission Viejo, CA
Why an Empty House Is the Risk
When someone is home, a burst line or a failing supply hose gets noticed within hours. When the house is empty for a week, the water can run until someone returns. Southern California rarely freezes, but pressure, age and failing connectors still cause bursts.
EPA WaterSense says the average household's leaks can account for more than 9,300 gallons of water wasted every year. Those are small leaks in an occupied house. A burst line in an empty one can release far more in a single day.
HomeServe describes the same logic. Turning off the main prevents a small leak from turning into major water damage and avoids emergency calls that can cost more on weekends and holidays. The decision is a trade between a few minutes of work and the chance of a bad return.
How Long Is Long Enough to Bother
| Time away | Suggested approach | Why |
|---|---|---|
| One night | Usually not needed | The odds of a failure are low and someone is back soon |
| A weekend | Optional, and easy if the valve is handy | A flood over two days is still expensive |
| A week or longer | Shut off the main, or arrange a daily check | A failure has more time to run |
| A long absence, such as a season | Shut off the main and drain the lines as advised | A long absence leaves the house unwatched |
These are rules of thumb. Your own situation, such as an older house or a history of leaks, can push the answer toward shutting off the water.
How to Shut Off the Main Safely
Find the valve
It is usually where the supply line enters the house, in a utility room, a garage or an exterior wall. Some homes have one at the meter.
Turn it off
A lever handle turns a quarter turn, with the handle across the pipe. A wheel handle turns clockwise until it stops.
Test it
Open a faucet and let it run until the water stops. That confirms the valve is working.
If the valve is stuck or leaks around the stem, call a plumber before you leave. A valve that has not been turned in years is easy to damage by forcing it. See emergency burst pipe repair for the same shutoff steps in an emergency.
What Else to Check Before You Leave
Shutting off the main stops water to the house, but a few things still hold water or depend on it. Check each of them before you go.
- Water heater. Ask a plumber or follow the manufacturer's guidance for a vacation setting. Never leave a gas heater with the cold supply closed and the burner running without checking the manual.
- Irrigation. Shutting the main stops sprinklers, which may harm plants in warm weather. A neighbor or a timer on a separate valve can handle that.
- Washing machine and dishwasher hoses. They are a common source of leaks, so close their supply valves.
- Ice maker. Turn off the supply line so a loose fitting cannot spill.
- Toilets. Look for a running tank before you go, since a running flapper can drain a lot of water over a week. See toilet repair.
If you have a water heater leaking or a tank that is near the end of its life, fix it before the trip. See emergency water heater repair and water heater replacement.
If You Return to Water on the Floor
Shut off the main, stay out of rooms with standing water if the power is on and document the damage with photos. Then call a plumber to stop the leak and a restoration service to start drying. The sooner wet materials are dry, the lower the risk of mold.
See water damage restoration in Mission Viejo for what to expect and how to document the loss. If the leak was under the floor, slab leak repair explains the next steps.
Leave a spare key and the plumber's number with the person checking the house. If they find water, they should close the main valve first and call second. Written instructions taped near the valve save time when someone else is the first to see the problem.
Take a quick photo of the meter and the main valve before you leave and again when you return. If the reading on your return is higher than when you left with the water off, a leak is on the supply side before the valve. That detail is worth telling the plumber.
Ask your insurer in advance what it expects when a house is empty for a long period. Some policies have conditions about vacancy or about who checks on the home.
Other Ways to Reduce the Risk
- Ask a neighbor or friend to check the house and know where the main valve is.
- Replace old braided supply hoses on toilets, sinks and washers before they fail.
- Have a plumber check your water pressure, since high pressure strains every fitting.
- Consider an automatic water shutoff device, which closes the main when it senses a flow that should not exist.
- Know your meter. A quick check before you leave and when you return can reveal a hidden leak. See leak detection if the meter moves.
Heading out and want the house checked first?
Call and describe the age of the home and any past leaks. A plumber can tell you what to look at before you go.
Sources and Standards
Local figures and standards on this page come from these published sources.
Common Questions
For a week or longer, many people do. It prevents a small leak or a burst from running unnoticed.
Yes. Test it afterward by running a faucet until the water stops. If the valve is stiff, have a plumber look at it.
Not for a normal trip in Southern California. For a long absence, ask a plumber what to do.
Follow the manufacturer's vacation setting, or ask a plumber. Do not leave a heater running with no water supply without checking the manual.
Yes. Plan for the plants separately, or leave the irrigation on its own valve.
Want the House Checked Before You Go?
Call any hour in Mission Viejo. Describe the home, its age and any past leaks, and the plumber will tell you what to check.
Call (949) 998-2846