How to Prepare Your Plumbing for a Summer Vacation

Why Summer Vacation Plumbing Preparation Matters More Than You Think

A leak that goes undetected for days or weeks can cause catastrophic damage—ruined flooring, warped cabinets, mold in walls, and even structural issues. The cost of a single plumbing failure while you’re away can easily run into thousands of dollars, and many homeowner insurance policies have exclusions for gradual leaks or neglect. Taking the time to prepare your plumbing before a summer vacation is not just a good idea; it’s a critical piece of home maintenance that protects your investment and gives you real peace of mind.

During summer, homes are often left empty for longer stretches than at any other time of year. Higher temperatures can stress pipes, and the lack of water movement can lead to stagnant water, bacteria growth, and even sewer gas backups. Below we break down every step you need to take, why each matters, and what additional measures can save you from disaster.

Step 1: Perform a Thorough Leak Inspection

Before you shut off any water, walk through your entire home and visually inspect every accessible pipe, fixture, and appliance. Look for:

Rust or corrosion on metal pipes, especially at joints and fittings.
Water stains or bubbling paint on walls, ceilings, or floors near plumbing runs.
Pooled water under sinks, around toilet bases, or near the water heater.
Dampness or mildew on basement walls or crawlspace floors.

Pay special attention to areas that are usually hidden: behind the washing machine, under the dishwasher, around the ice maker line, and at the refrigerator water connection. Even a tiny drip can waste gallons per day. According to the EPA’s WaterSense program, household leaks can waste nearly 10,000 gallons of water annually. Finding and fixing them before you leave not only prevents damage but also saves water.

If you detect any leaks, repair them immediately. For small leaks in compression fittings, tightening the nut may suffice. For corroded pipes or failed washers, replace the part or call a licensed plumber. Don’t assume a slow drip won’t turn into a gusher while you’re away—many flood claims start from a pinhole leak that suddenly failed.

Using a Water Leak Detector for Extra Safety

Consider installing smart water leak detectors near potential trouble spots. These battery-powered devices sound an alarm and send notifications to your phone when they sense moisture. Some models can even be paired with an automatic water shut-off valve. While not a replacement for a manual inspection, they provide a safety net if a leak develops after you’ve left. Place detectors under sinks, behind the refrigerator, near the water heater, and beside the washing machine.

Step 2: Locate and Test Your Main Water Shut-Off Valve

The most effective way to prevent water damage while you’re away is to turn off the main water supply. But simply knowing where the valve is isn’t enough—you need to test it before you go. Many homeowners discover their shut-off valve is seized or doesn’t fully close when they need it most during an emergency.

Find your main shut-off valve. It’s usually:

Near the water meter (often in a basement, garage, or utility closet).
In a crawlspace or on a wall near the front of the house.
Outside near the foundation, sometimes in a buried box with a lid.

Turn the valve clockwise (righty-tighty) until it stops. If it’s a gate valve, turn the handle fully. For a ball valve, rotate the lever 90 degrees until perpendicular to the pipe. Then open a faucet inside the house to verify the water stops. If water continues to flow, the valve may be faulty and should be replaced by a plumber immediately.

Note: If you have a well system, you may need to turn off the pump as well. Follow the manufacturer’s instructions or consult your well installer.

When Not to Turn Off the Main Water

If you have automatic irrigation, a swimming pool refill system, or a pet sitter who needs water, turning off the main valve may not be practical. In such cases, consider shutting off water only to the house interior (if your plumbing has a separate valve) or installing a smart water shut-off system that can be controlled remotely. Also, if you leave a house-sitter, make sure they know where the shut-off valve is and how to turn it on or off.

Step 3: Drain the Water Heater

Draining your water heater before a long absence prevents sediment buildup and reduces the risk of leaks from thermal expansion. When the heater sits unused with hot water inside, minerals can settle and cause corrosion, especially in areas with hard water. The pressure from the heated water can also stress the tank and connections.

To drain safely:

Turn off the power supply to an electric water heater at the breaker, or turn the gas control valve to “pilot” (do not turn off the gas completely—relighting may require a professional).
Close the cold water inlet valve.
Attach a garden hose to the drain valve at the bottom of the tank and run the other end to a floor drain or outside.
Open a hot water faucet somewhere in the house to allow air in.
Open the drain valve and let the water flow until the tank is empty.
Leave the drain valve open and the hot water faucet open while you’re away.

If you have a tankless water heater, follow the manufacturer’s instructions for winterizing or draining. Some models require flushing with vinegar to descale, which is best done before a long period of no use.

Step 4: Clear Refrigerator and Ice Maker Water Lines

Refrigerator water lines are a common source of hidden leaks. The small plastic tubing can crack, or the connection can work loose. Even if you turn off the main water supply, a refrigerator with a built-in water line that bypasses the main shut-off may still have pressure inside. Many refrigerators have their own shut-off valve (often under the sink or behind the fridge). Close that valve, then disconnect the line and drain it into a bucket. Wipe up any residual moisture.

If you cannot turn off the refrigerator water line separately, consider moving the fridge and inspecting the connection. Better yet, if you are turning off the main water supply, the refrigerator line will also be pressureless—but still open the faucet to drain the line so no standing water remains.

Step 5: Check and Seal Exposed Pipes

Pipes in unconditioned spaces like attics, basements, garages, and crawlspaces are vulnerable to temperature swings and humidity. While you’re away, summer heat can cause condensation on cold water pipes, leading to moisture damage or mold. More importantly, if there’s any chance the temperature could drop unexpectedly (even in summer), uninsulated pipes can freeze and burst.

Inspect exposed pipes for existing damage or loose fittings. Use foam insulation sleeves for long pipe runs and foam sealant (spray or caulk) around gaps where pipes pass through walls, floors, or ceilings. Seal any holes that could allow rodents or insects to enter—they sometimes chew through plastic pipes.

Step 6: Prevent Sewer Gas from Entering Your Home

When a home is unoccupied for weeks, the water in seldom-used floor drains, sink traps, and toilet bowls can evaporate. Without a water seal, sewer gas—containing methane, hydrogen sulfide, and other unpleasant substances—can rise into your living space. Not only does it smell bad, but it can also be a health hazard and attract insects.

To prevent this:

Pour a cup of mineral oil or vegetable oil into each floor drain. Oil floats on top of the water and greatly slows evaporation. A few drops of essential oil can also mask odors.
Flush all toilets and then pour a cup of water into each bowl to ensure they are full. You can also add a few tablespoons of vegetable oil to the toilet bowl water to reduce evaporation.
Pour a small amount of water down each sink and tub drain, then add oil as well.

If you have a home with a basement or garage floor drain, this step is especially important. For more details, the International Association of Certified Home Inspectors provides guidance on sewer gas prevention.

Step 7: Prepare Outdoor Plumbing

Summer vacation often involves leaving garden hoses attached to outdoor spigots. A hose left connected can create a backflow hazard if water pressure fluctuates, and the spigot itself can freeze if temperatures drop. Even in summer, a cold snap can damage an exposed outdoor faucet.

Disconnect all garden hoses. Drain them and store them out of the sun.
Turn off outdoor water supply valves (if separate from the main).
Open outdoor faucets to drain any remaining water, then leave them slightly open to relieve pressure.
Inspect outdoor spigots for leaks or cracks. Replace frost-free spigots if damaged.
Drain and winterize sprinkler systems even in summer if you will be gone more than a month. Standing water in irrigation lines can grow bacteria or attract pests.

Step 8: Double-Check Appliances and Fixtures

Before you lock up, verify that every appliance that uses water is off and secured:

Washing machine: Ensure the hoses are not kinked or cracked. Consider turning off the washing machine’s supply valves (usually cold and hot behind the machine).
Dishwasher: Run a cleaning cycle and then leave the door slightly ajar to dry. Turn off the supply valve if accessible.
Sump pump: If you have a basement, test the sump pump and consider adding a battery backup. Heavy summer storms can cause flooding even when you’re away.
Toilets: Press down on each toilet handle to ensure the flapper closes properly. If a toilet runs continuously, fix it before leaving.
Water softener: If your system uses a brine tank, ensure it is not leaking. Some units have a bypass valve that can be engaged during absence.

Step 9: Leave a Key with a Trusted Neighbor

No amount of preparation beats having someone physically check on your home. Provide a trusted neighbor or friend with a key, a contact number, and clear instructions on what to do if they hear water running or see a leak. You can also leave a small bucket and a wet/dry vacuum for emergencies. If you have a smart home system, give them the passcode for the security panel.

Let them know where the main water shut-off valve is and how to turn it off. If possible, ask them to walk through the house at least once a week to verify all is dry and quiet.

Step 10: Final Checklist Before You Leave

Use this quick checklist to confirm everything is done:

✅ All visible pipes inspected and leaks repaired.
✅ Main water supply turned off (or individual valves closed).
✅ Water heater drained and powered off (or set to vacation mode).
✅ Refrigerator water line disconnected and drained.
✅ Exposed pipes insulated and sealed.
✅ Floor drains and sink traps treated with oil.
✅ Outdoor hoses disconnected, faucets drained.
✅ All appliances and fixtures off and supply valves closed where possible.
✅ Sump pump tested, battery backup installed if needed.
✅ Key and emergency instructions left with neighbor.
✅ Smart leak detectors active and app working.

If you have pets that will be staying with a sitter, make sure the sitter knows which faucets and toilets are safe to use (if main water is off, they can use bottled water and a bucket to flush).

What to Do When You Return

After your vacation, follow these steps to safely restore your plumbing:

Turn the main water supply back on slowly. Open a faucet to let air out of the pipes before closing it.
Check for leaks at all connections, especially where you recently made repairs.
Reconnect the refrigerator water line and run a few cups through the ice maker before using the ice.
Refill the water heater (close the drain valve, open the cold water inlet, let the tank fill before turning on the power/gas—never turn on an empty tank).
Flush all toilets and run each faucet for a couple of minutes to refill traps and clear any stagnant water.
Inspect under sinks and around appliances for any signs of leaks that may have developed despite your precautions.

Smart Technology and Professional Help

If you want extra peace of mind, consider investing in a whole-home water shut-off system that connects to your Wi-Fi. These systems monitor water flow and can automatically shut off the main valve if they detect an anomaly. Some even send real-time alerts to your phone. Brands like Phyn, Flo by Moen, and Eve Water Guard are popular choices. Read reviews on a site like CNET’s best smart leak detectors to find one that suits your home.

For older homes or properties with complex plumbing, consider hiring a licensed plumber to perform a pre-vacation inspection. They can check for hidden leaks, test pressure, and advise on specific concerns like galvanized pipe corrosion or outdated shut-off valves. The cost of an inspection is small compared to the potential damage from an undetected leak.

Conclusion: Enjoy Your Vacation Without Plumbing Worries

Preparing your plumbing for a summer vacation doesn’t have to be overwhelming. By following the steps above—inspecting for leaks, shutting off the main water supply, draining the water heater, protecting drains from sewer gas, and arranging for a neighbor to check in—you dramatically reduce the risk of water damage. A little time invested before you leave ensures you return to a dry, safe home. Relax, enjoy your time away, and know you’ve taken the right precautions. Safe travels!