Should You Turn Off Water When on Vacation? Essential Water System Prep Tips

Planning a vacation is exciting, but forgetting to prepare your home’s water system could leave you returning to costly plumbing issues. From leaks to bacterial growth, stagnant water can cause significant damage if left unchecked for even a few days.

Fortunately, with a few smart steps, such as turning off your water supply and preparing your water filters, you can leave your home worry-free.

Why You Should Turn Off the Water When On Vacation

When water sits stagnant in your pipes for extended periods, it becomes the perfect breeding ground for bacteria like Legionella, which can multiply rapidly without regular flow. Metallic tastes or foul odors are a sure sign of underlying plumbing issues caused by stagnation, such as corrosion inside your plumbing system.

Even if your home is brand new or well-maintained, unused water lines during your vacation can cause the plumbing’s microbiome to shift unfavorably, especially if you use untreated well water or rely on a water softener or UV sterilizer.

Checklist: What to Do Before You Leave

If you plan to be away for a few weeks or are preparing for an extended vacation, it is especially important to turn off the water to prevent leaks or water damage while you’re gone. Here’s a simple step-by-step guide to protect your water system before heading out:

1. Turn Off the Main Water Valve

This is the single most effective step to prevent leaks or floods while you’re gone. Locate the main shut-off valve or main water supply valve—typically near the water meter or where the water line enters your home. This valve may have either a wheel control, which you turn clockwise to close, or a lever handle to operate. Turning off the water or shutting off the water at this valve is the most important step for a safe water shutoff before vacation. Always turn off your water at the main valve to prevent issues while away.

2. Drain Faucets and Toilets

Open your cold water faucets to drain any remaining water from the lines. It’s also important to check and clear drains to prevent clogs and odors from developing while you are away. If you’re leaving for more than a week, flush toilets and consider turning off the toilet shutoff valves to prevent phantom leaks.

3. Inspect Pipes and Fixtures

Before leaving, inspect visible pipes, sinks, and appliances for any signs of leaks, corrosion, or a broken pipe. Carefully check each pipe and water pipe, as even a single compromised pipe or water pipe can result in a leak that leads to a flood, flooded areas, or flooding in your home. Fix anything questionable—minor issues can escalate quickly in your absence. Pipe bursts or undetected problems with water pipes can cause extensive damage, serious water damage, or even extensive water damage if left unchecked while you are away.

4. Set Water Softener or RO System to Vacation Mode

Most modern water softeners have a “bypass” or “vacation” mode. This prevents the system from regenerating or wasting salt while you’re away. If unavailable, you may manually regenerate the softener before departure.

For reverse osmosis (RO) systems, shut off the system and open up the faucet and drain the storage tank to avoid stagnant water issues.

5. Backwash or Replace Sediment Filters

Sediment buildup can lower water quality and clog filters. If you have a whole-house water filter, it’s a good idea to flush or replace the pre-filter before you go. This ensures cleaner water flow when you return.

6. Know Your UV Sterilizer Protocol

If you have a UV sterilizer, it is good to unplug it; however, when you return and turn it back on, allow it to operate for several minutes before using water in the house.

Water Heater Tips Before You Travel

Your water heater consumes a significant amount of energy, even when not in use. Here’s how to handle it before you leave:

• Use Vacation Mode: Most newer water heaters have a vacation or “low” setting. This reduces energy use while maintaining a temperature high enough to prevent bacterial growth.
• Manual Settings: If no vacation mode is available, you can manually lower the thermostat to its lowest setting (typically around 50°F) or completely shut it off at the circuit breaker (for electric units) or gas valve.
• For Long Trips (2+ Weeks): Consider draining the water heater if you’re shutting off water to the house entirely. Draining your hot water tank is especially important in cold weather, since water expands when it freezes and can damage the tank or pipes. This also prevents sediment buildup and reduces risks from leaks or temperature shifts.

What to Do When You Return

Getting back home is a relief—unless you turn on your faucets and find rusty, smelly, or discolored water. Unexpected water issues can happen while you are away, so it is important to check your system carefully when you return. Follow these steps to restart your water system safely:

1. Turn On the Water Supply Slowly

Slowly reopen your main valve to avoid sudden pressure surges that can damage pipes or fittings.

2. Flush Faucets and Appliances

Start with the cold water side of each faucet and let it run for several minutes until it flows clear. Follow with the hot water side. Flush showers, toilets, and any outdoor spigots.

3. Regenerate Softeners and Recharge RO Tanks

Set your softener to regenerate and turn the water back on to the RO. Allow it to refill your RO tank. Let the RO system run for 5 minutes before using the water for drinking or cooking.

4. Inspect for Odors or Leaks

Check for any musty smells or puddles under sinks and around appliances. If anything looks or smells off, consider sanitizing your system or calling a plumber.

Why Sediment Filters and UV Sterilizers Matter

A well-prepared home water system includes quality filtration and disinfection:

• Sediment Filters: These catch dirt, rust, and debris before it enters your plumbing or appliances. Replace or backwash these filters before long trips to avoid clogs or water pressure issues.
• UV Sterilizers: These use ultraviolet light to kill bacteria and viruses in your water. But they only work when the water is clear, so they rely on a sediment filter to maintain performance. Always check and clean the quartz sleeve of your UV lamp as part of routine maintenance.

Winter or Well Water? Read This First

For homes in colder regions or those using well water, extra steps apply:

• Drain Your System: If freezing temps are possible, drain all pipes and keep the heat in your home at or above 55°F to prevent freezing. Draining your system helps prevent frozen pipes and frozen water in your piping, which can cause bursts and significant water damage.
• Shut Off Well Pump: For extended trips, turn off your well pump at the breaker to avoid pressure issues or mechanical wear.

If your main water supply valve or sump pump is located in the basement or crawl space, be sure to check these areas for proper operation before leaving.

Final Thoughts

Prepping your water system before vacation is a simple but powerful way to avoid serious issues. By shutting off the water supply, adjusting your heater, flushing filters, and managing your UV or RO systems, you protect both your home and your peace of mind. Follow this guide before every extended trip, and you’ll return to a fresh, safe, and ready-to-use water supply.

Additional Resources:

• EPA Guide to Maintaining Water Quality in Low-Use Buildings

• CDC Guidance on Legionella Prevention in Rentals

Frequently Asked Questions (FAQs)

1. Should I shut off the main water supply before vacation?

Yes, this is the most effective way to prevent leaks or water damage while you’re away.

2. Do insurance companies or insurance policies require shutting off the water supply before leaving?

Some insurance companies and insurance policies require you to turn off the water supply before going on vacation or during a summer vacation. Failing to do so may result in denied claims or reduced coverage if water damage occurs while you’re away. Always check your policy details and consult your insurance company for specific requirements.

3. Should I hire a professional plumber to inspect my plumbing before an extended absence?

Hiring a professional plumber before going on vacation is a good idea, especially for longer trips. A plumber can check for leaks, inspect water pressure valves, and ensure your system is in good condition to prevent issues while you’re away.

4. Can automation products or water pressure valves help protect my home while I’m away?

Yes, installing automation products or smart water pressure valves can help monitor for high water pressure, leaks, or other plumbing issues. Many automation products send alerts to your smartphone and allow you to shut off the water remotely, providing peace of mind during your absence.

5. Should I inspect washing machine hoses and the sprinkler system before leaving?

Absolutely. Washing machine hoses are a common source of leaks, and a broken sprinkler system can cause flooding in your yard. Inspect both for wear or damage and replace or repair as needed before your trip.

6. Is it a good idea to arrange for a house sitter when going on vacation or during summer vacation?

Yes, having a trusted house sitter check on your home can help catch plumbing or urgent issues early, reducing the risk of major damage while you’re away.

7. What is the last thing I should do before leaving for vacation?

The last thing you should do before leaving is to shut off the main water supply. This simple step can prevent floods, leaks, and water damage while you’re away.

8. Do I need to turn off my water softener or filtration system?

Most softeners have a vacation mode or bypass setting. RO systems and UV sterilizers may require draining or continuous operation depending on usage and length of absence.

9. Can I turn off my UV sterilizer when I’m away?

Yes. When you return, run the water for three minutes before drinking or cooking to flush anything that sat in the lines while the lamp was off.

10. Should I drain the water heater?

If you’re turning off your water supply for an extended period, draining your water heater can help prevent sediment buildup or pressure problems.

11. Is it really necessary to flush the system when I get back?

Yes. Flushing removes stagnant water, sediment, and any bacterial buildup that may have occurred.